This can be the best sales tool and the best defense against a customer claiming that you replaced their rotors unnecessarily. The lip on the rotor fits inside the recess without affecting the measurement. Minimum thickness was to insure,,, in theory anyway that it would last thru another set of pads or shoes back in the day. This is when it is permissible to machine a new rotor with an on-the-car brake lathe. I can't see ever going to the dealer, or a mechanic, to do them. Even if it looks like it is below specifications, it should be measured and documented on the repair order. MBWorld Featured Car of the Month Contest, E55, E63, E53, E43 AMGs (W210, W211, W212, W213), CLS63, CLS55, CLS53 AMG (C219, C218, C257), S63 AMG, S63 AMG 4Matic, S65 AMG (W222, V222), S63 AMG 4MATIC Coupe, S65 AMG Coupe (C217), Convert. This video is presented by The Group Training Academy. How to Install Power Stop Brakes and Rotors, How To Install Anti-Rattle Clips on Brake Pads, How To Change Brake Pads on 2007 Honda Civic. Wheel bearings are safety-critical components which feature precision engineering, robust construction, and a long service life. How do you measure brake shoe lining? Throughout his career journey from medicine to an MBA, some key themes prevail for Sethi the desire to serve and a passion to innovate. These comebacks often start with blaming the new pads, and end with the customer having to return a second or third time until someone pulls out a dial indicator and micrometer. This is usually around 0.002 per revolution. With a little observation a guy can look at a rotor and tell if its worthy of a set of pads You might consider something like these pinch calipers. They automatically receive your IP address when this occurs. The best way to make sure a lathe is cutting rotors the right way is to make sure your cutting bits are fresh, adapters are true and the crossfeed is set properly. Sooner rather than later, you will find a vehicle that will not be magically fixed by a new set of rotors. FAQ: How Do Autonomous Brake Systems Work. A larger diameter rotor will need to turn slower than a small diameter one. Crikey, you ain't building space ships. Many cheap castings are poured with a minimal amount of iron. Yes but then you would create another 27 pages of posts talking about it. Questions about how MBWorld.org worksnot for car questions. For every brake job, you should always use a micrometer or dial indicator to measure for runout (rotor and flange) and the dimensions of the rotor before brake service is performed. The information inside the log files includes internet protocol (IP) addresses, type of browser, Internet Service Provider (ISP), date/time stamp, referring/exit pages, and number of clicks to analyze trends, administer the site, track user's movement around the site, and gather demographic information. Place the cut-off end of the straw next to your ruler and mark 5mm from the end. Some rotor manufacturers will even cut corners by not meeting the nominal or new rotor thickness requirements in order to save a buck. This helps to match the rotors to the hub flange. Measuring the rotor thickness should be part of any brake job. If the technician or counterman is only going by the price they see on the screen, it will be difficult to pick the best rotor. Not going to be used daily, weekly or even monthly - more like yearly at most. Runout greater than .005 (.001 depending on the rotor or flange diameter) is a sign that the flange, rotor and/or bearing should be replaced. For non-composite rotors, it is possible to take as much as 0.020 per side while still having an acceptable finish. If its thinner than this, consider getting a replacement soon. Presenting your customer with inspection results and benefits of replacement will help sell the job. Using scan-tool data PID information to its fullest potential. Labor in a shop does not take up inventory and does not have to be delivered by a parts store. 1: NTNs Georgianne Dickey, VIDEO: Selecting The Right ACDelco Spark Plug, VIDEO: GM Transmissions And Transfer Cases, Quality-Built Brake Pads and Rotors Powered by MPA, Finding, Fixing Runout and Disc Thickness Variation, The importance of wheel bearings to the overall vehicle, The impact of extreme usage, environments on wheel bearings, Common customer concerns, and how to correctly diagnose the cause of the symptom the first time. Before worrying about thickness I'd to check for warping/flatness and any surface damage. By subscribing, youll receive the ShopOwner digital edition magazine (12 times/year) featuring articles from Brake & Front End and the Brake & Front End eNewsletter (twice weekly). If it ain't broke it don't need fixin. Planning and preparation help faith in our automotive partners is absolutely critical. This course is sponsored by Cloyes. Would that work? You should check bearing flange runout after friction surface runout. However, manufacturers provide minimum thicknesses for their rotors. This can be done by changing the rotor position 180 on the bearing. Thickness gauges are measuring instruments that can be used to determine the thickness or gauge of a material. Dont settle for almost - it matters where the engine is manufactured or remanufactured. Over the course of those 5 million revolutions, enough material is removed to create a thickness variation that can be felt by the driver. Don't know what will happen. Archive - Never use the ballpoint pen measurement method when machining rotors. How do you measure rotor thickness with a micrometer? The new complete strut assemblies represent additional 380,000 vehicles in new coverage and expand the PRT brand portfolio. OD = Outside Diameter: Measure from outside edge to outside edge. JavaScript is disabled. Some manufacturers specify zero DTV. How to sell and manage difficult bearing replacement jobs, reduce installation times and costly comebacks, How to deal with corrosion buildup between the bearing, hub, and knuckle, Matt Gorski, Manager of Product Development, NTN Bearing Corporation of America, Divjot Singh, Applications Engineer, NTN Bearing Corporation of America, Brian Sexton, Automotive Technical Writer, Babcox Media. Mine has 97K. What is the rotor diameter of a wind turbine? Sometines more than the min thickness needs to be turned off so its less. The Rustbelt Mechanic talks about becoming a mentor and preparing for growth. In fact, the new rotors may cause even more problems and lead to an unsatisfied customer. Even a perfect premium rotor will have runout if it is put on a flange with runout or corrosion. What instrument is the best for measuring the thickness of a certain material? If the technician or counterman is only going by the price they see on the screen, it will be difficult to pick the best rotor. With all of the technical advancements in cars, can you even consider working under the proverbial shade tree? This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Larger rotor diameters allow wind turbines to sweep more area, capture more wind, and produce more electricity. TPMS Talk: Fundamentals of Fast and Efficient TPMS Service, ADAS: Diagnosing False Activations and Warnings, New Variable Valve Timing Course Available On T2U, VIDEO: Selecting The Right ACDelco Spark Plug, VIDEO: Brake Rotor Minimum Thickness Specification. Since this isnt very precise, try using a digital caliper on a single sheet instead. Learn how to streamline the diagnostic process for driveability issues. Labor in a shop does not take up inventory and does not have to be delivered by a parts store. Sort of like piece of wood in the FSM used in the caliper rebuild. P= 0.5*rho*A*V3, where rho is the air density, and A is the swept area of the turbine (A=pi*r2). Never use the ballpoint pen measurement method when machining rotors. Measurements should be taken a quarter inch from the edge. A new rotor could have excessive runout when it is installed on the vehicle due to a stacking of tolerances. In this case it is at least still over the minimum figure. If you do anything we show here and it breaks your stuff, not our problem take responsibility for your own actions! Which instrument is used to measure thickness? Land Cruiser solutions you didn't know you needed. Disc brake rotors usually last so long that many people treat them as fit and forget components. Measure the brake rotor thickness 0.40 inches (10mm) inside the outer circumference of the brake rotor every 45 ( 1 / 8 of a rotation). To me it's about significant digits. I just did brakes on. Measuring the rotor thickness should be part of any brake job. How To Answer Customer Ride Control Questions, Smooth Roads Ahead: Making Wheel Bearing Jobs Work for Your Shop. Terms of Service - 458BXR Automotive Disc Brake Micrometer 67536 Best used for measuring the depth of wear grooves in disc of brake systems. After the rotor is resurfaced or a new rotor is installed, the rotor should be measured for runout when it is installed on the vehicle as a quality control measure. Get ready for winter with Milwaukee's 2022 men's and women's heated gear lineup. Cutting too fast will reduce the cut quality and possibly create chatter. Runout in the hub and new rotor can stack up to cause Disc Thickness Variation (DTV) within a few thousand miles. Eventually, these problems create stress in the rotor that leads to distortion and results in a pulsation complaint. Looking to purchase something inexpensive to measure brake rotor thickness. how to measure brake shoe thickness. DTV is the main cause of pulsation. Now, your computer or smart device can be your virtual classroom. Generally speaking, the DTV should not vary more than .001. Its impossible to tell how much life is left on the brake rotors by simply looking at it. Yeah brakes are one of those things that are deceptively easy on the 80s. It may not display this or other websites correctly. Rotor thickness should be measured in at least six areas of the rotors face. With all the time spent reading and writing these posts you could have removed the calipers and measured both rotors. It has often been said that you should never machine new rotors. What is the requirement of the rotors to know if they are in or out of specification? Given the thumbs up or thumbs down, put it all back together, driven back home, and I'd still be back soon enough to reply to this exact posting at this exact time. Either the pad will have a nice groove dug in and the lip will stay there, or the pad will grind down the lip with reduced braking at first. It's not your father's industry anymore. If you can see a difference in plate thickness, it is a sign that the hardware and caliper need replacement. It's not rocket science. I could have driven to e's place, taken off his tires, taken off his calipers, measured. Some people think that installing new rotors eliminates the possibility of a comeback; however, this myth creates more comebacks than it solves. Check out our Patreon for support options, buy a shirt, buy our apps, use my NordVPN affiliate link to sign up to their service or donate via Paypal: At MotoFaction.org, the privacy of our visitors is of extreme importance to us. Over 6,000 miles, that spot on the rotor will go past the pads more than 5 million times. See our disclaimer here. Agreed but I use Mitutoyo calipers which have a recess on both sides of the jaws. For a better experience, please enable JavaScript in your browser before proceeding. However, with a composite rotor or one with hard spots, the depth should be reduced, likely below 0.010 per side for a quality finish. How do you measure brake disc diameter without removing wheel? This can be done by changing the rotor position 180 on the bearing. Ideally, your brake pads should be thicker than 6.4 mm ( inches) for proper functioning. Sometimes one rotor surface is too thin even though the other sude is like new. Even if it looks like it is below specifications, it should be measured and documented on the repair order. I agree with George. Employees of Babcox Media, Tomorrows Technician, sponsors and advertisers are not eligible to enter. MotoFaction.org's privacy policy does not apply to, and we cannot control the activities of, such other advertisers or web sites. GM transmissions and transfer cases are unique to each individual vehicle. JavaScript is disabled. In order to remove this much material, it is essential to have sharp bits. Um. A runout of more than 0.005 (0.125 mm) at the bearing flange cannot be corrected by the use of a shim. Mark the high and low spots on the rotor. Bolt hole diameter: measure from inside edge of bolt hole to opposite inside edge. DTV is the main cause of pulsation. You are using an out of date browser. What tool is used to most accurately measure the thickness of a brake rotor? squish insert compression cylinder head stroke vhm adjusting inserts selecting correct ideal profiles blank machine custom Ready to plan for phase 2 of your career? High under-hood temps, increased power demands and vibration can damage alternators or starters. This video is sponsored by Continental. rotor disc brake grease flush hub fig fill mazda This could be due in part to bearing design, construction, corrosion buildup, and/or replacement parts selection. According to a recent U.S. International Trade Commission report, 80% of the rotors sold today are made in a country outside the United States. After the rotor is installed, verify that the runout is below specifications. Multiplying this number by 10 will convert the unit of measurement to millimeters and tell you how long your object is in millimeters up to this point. It has often been said that you should never machine new rotors. Advertising - Discussing the inputs, processing, and outputs at the core of today's engine management platforms. 93 Fzj80 new aisin mc. According to a recent U.S. International Trade Commission report, 80% of the rotors sold today are made in a country outside the United States. But if I need to justify I record what my mm ruler tells me those pads are. It is tough for a technician to know what they are getting when they buy a new rotor. Rotate the rotor to find the high spot. Cutting a rotor in one pass is essential for productivity. If there wasn't a spec many people would simply run them till they wore thru rotors or drums. You may think that you are not paid to measure thickness and runout, but are you paid for a comeback? Do Not Sell My Personal Information -, By logging into your account, you agree to our, Currently Active Users Viewing This Thread: 1, The following errors occurred with your submission, 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe. Some rotor manufacturers care only about the external dimensions of a rotor the engineer wants it to fit and disregards its performance attributes. Turbo performance can only be impaired by mechanical damage or debris. Measurements should be taken a 1/4 from the edge. But this is very expensive and very fragile. But I don't remember the rotor. Generally speaking, the DTV should not vary more than 0.001. However, some aftermarket rotor manufacturers will take the OE design and make it better in order to exceed customer expectations. This is the total indicated runout. Engineers will put in years of research and development in order to develop and manufacture a rotor that can go beyond OE specifications. Even if you install a new rotor, you are setting yourself up for a comeback if you do not measure using a micrometer or dial indicator. (A217), CL55 AMG, CL65 AMG, CL63 AMG (C215, C216), AMG GT: GT, GTS, GTC, GTR, GT-4door (C190 / R190), GLC63s, GLC63, GLC43 AMG SUV and Coupe (X253, C253), GLE63s, GLE63, GLE53 AMG SUV & Coupe (W166, W167), MB Coupes & Cabriolets Vendor Classifieds, Mercedes-Benz SUVs, Trucks, Vans, Diesels, Other, MB SUVs, Trucks, Vans, Diesels Vendor Classfieds, Classic, Vintage Mercedes-Benz Vehicles, Other Cars, Classic, Vintage MB Vehicles Vendor Classifieds, General Discussion of Mercedes-Benz Classics. This model features . NGK is dedicated to meeting the learning needs of all skill levels. But, what if the runout exceeds the manufacturers specifications when the new rotor is installed on the vehicle? Installing new rotors without ever measuring and documenting the condition of the old rotor is like playing chicken with a comeback. http://www.starrett.com/metrology/meortBy=none/asc, http://www.autozone.com/autozone/accer=186497_0_0_. AmeriBRAKES brake pad line is environmentally friendly and covers all of your needs. Rotors. Privacy Statement - The Tomorrows Tech Today newsletter is your portal to relevant technical content every school day. How to select the right replacement part for the job. Many cheap castings are poured with a minimal amount of iron. It can be more challenging than usual to accurately check the thickness of a brake rotors whose pads have worn a groove in the center; As a side point, with most discs you can find out the minimum thickness somewhere on it - here stamped in the steel: Using a set of digital vernier calipers (eBay US, eBay UK, eBay AU) we can get a reading of the thickness of the rotor but in this case the ridge is too deep to measure the part swept by the brake pad, only the outer ridge: Most calipers have a cut-out in them to get around small ridges but if the ridge is too great that won't help. In some cases with excessive runout, a new rotor should be machined to match the vehicle. Sponsored by ACDelco. Some rotor manufacturers care only about the external dimensions of a rotor the engineer wants it to fit and disregards its performance attributes. IP addresses, and other such information are not linked to any information that is personally identifiable. Checking the thickness of your brake disc or rotor? If you can see a difference in plate thickness, its a sign that the hardware and caliper need replacement. What is the minimum brake disc thickness? This is the total indicated runout. Podcast: T2iQ With The Rustbelt Mechanic - What's Next? This creates problems with porosity and strength. Rotate the rotor to find the high spot. mod. For every brake job, you should always measure for runout (rotor and flange) and the dimensions of the rotor before brake service is performed. In fact, the new rotors may cause even more problems and lead to an unsatisfied customer. It is tough for a technician to know what they are getting when they buy a new rotor. The car was about A year old and shit a factory pad, maybe just off warranty I don't remember but ground a coupe of rivet grooves in it. The only time to worry about it is when replacing brakes. Installing new rotors is not a way to avoid having to use a micrometer or dial indicator. I am not running 100 pads so I don't know. In fact, there are four different types to choose from, so before replacing your vehicles rotors, make sure youre choosing the right one for your needs. You may think you are saving 10 minutes by not having to drag out a dial indicator and a micrometer, but your chance for comebacks can dramatically increase. Eventually, these problems create stress in the rotor that leads to distortion and results in a pulsation complaint. This creates problems with porosity and strength. Youll get free, unlimited access to an innovative, exciting and inspiring educational resource that will connect instructors, students and suppliers every day during the school year. 1996 80 series brake fluid leak under passenger side door. A new rotor could have excessive runout when it is installed on the vehicle due to a stacking of tolerances. MotoFaction.org does use cookies to store information about visitors preferences, record user-specific information on which pages the user access or visit, customize Web page content based on visitors browser type or other information that the visitor sends via their browser. You must log in or register to reply here. Those long-reach calipers look pretty cool; I hadn't seen those before. MotoFaction.org has no access to or control over these cookies that are used by third-party advertisers. Move the mark to 0mm on your ruler and take your final measurement. Access to digital editions, contests, news, and more are ready for you today! You can clearly see why it isn't affected by the ridge: In this case we can see that there is about a 1mm measured difference between the two tools. In order to remove this much material, it is essential to have sharp bits. You can buy used 0-1" micrometers all day on ebay for $10 or less, shipped. Mark the high and low spots on the rotor. real world, I have a metric steel rule I check brake linings with, IF they look questionable, but at that point it's like, well, replace them anyway. In addition to Tomorrows Tech's massive library of printed and video resources providing comprehensive educational programming, from collision repair to engine building to updated information on tools and scanners, to the latest in TPMS and ADAS technology, we offer technical articles and training videos that provide in-depth explanations of systems and procedures for nearly every segment of the automotive industry. The friction material on a new brake pad is typically about 8-12 millimeters thick, and those that are ready for replacement are worn down to about 3 mm. After the rotor is resurfaced or a new rotor is installed, the rotor should be measured for runout when it is installed on the vehicle as a quality control method. Single-speed lathes are set at the slower speed of the largest application they are designed to cut. If a digital measurement isnt an option, use a manual micrometer or caliper for more accuracy. Single-speed lathes are set at the slower speed of the largest application they are designed to cut. Sponsored by Standard Motor Products. a micrometer would be a better tool, to avoid the lip of rust at the perimeter of the disc. In the industry, this is called the round and heavy philosophy. This video is sponsored by ACDelco. Domestic vehicle systems, driveability diagnostic steps, and walking through the scan tool data PIDs to fix the car right the first time. They aren't a fast mover and a battery is usually the only problem. Bled but still messed up. Also please note that any links provided may be part of an affiliate programme (viz. 300-1.300 Range and . The needle of the dial indicator should be perpendicular to the rotor. About Us - Doesn't running 100 series pads get rid of the lip on the rotor? It isnt just about the thickness. A premium lighting solution for heavy-duty equipment and automotive technicians. ARB fridge is the best mod I ever did! rotors discs Use a micrometer at the thinnest point on the surface of the rotor where it meets the pads to measure the minimum operational thickness. Bill Babcox and John Lussier discuss supply chain challenges, the value of OE heritage, international business and more. Multiply the centimeter measurement just before the end of your object by 10. The only real way to measure is with a profilometer that measures the roughness average. This technical topic is geared for the average B+ technician and/or a refresher for the A technician. How do you measure the diameter of a wind turbine rotor? In that situation you need to use a tool that can get around the ridge - we had a micrometer on-hand (eBay US, eBay UK, eBay AU) so that's what we are using here. friction drum clutch specs What thickness should I replace my rotors? Google's use of the DART cookie enables it to serve ads to users based on their visit to MotoFaction.org and other sites on the Internet. Cookie Policy - When machining a rotor, you have two primary goals: provide a smooth surface finish for the pads and provide a true surface finish. Poor rotor finish can lead to noise. Every time this spot passes the pads, a little bit of the rotors material is removed. With a little observation a guy can look at a rotor and tell if its worthy of a set of pads.