How to measure Brake Rotor Lateral Runout and Minimum Thickness

hi my name is Wayne I am an ASE certified master technician I have over 34 years of experience today you and I are going to help to repair your car today we're going to be working on a 1999 Acura Integra we're going to be measuring the brake rotors for excessive lateral run-out and for minimum thickness on both the front and rear brake rotors now a front brake rotor if it has too much lateral run-out it will cause the steering wheel to shake when we brake and the pedal to move up and down the brake pedal the rear brake rotor will only cause us to have a pulsation in the brake pedal but still the car will shake now let's get it up in the air pull the wheels for today's inspection we will be using our safety gloves our safety goggles a digital micrometer a dial indicator our trusty flashlight 12 millimeter wrench a 3/8 ratchet 1/2 inch ratchet 17 millimeter and a 19 millimeter 1/2 inch drive 1/2 inch torque wrench our pneumatic half-inch impact wrench and the small pry bar we've removed the bolts which attached the caliper to the spindle and we've used tie straps to hold the caliper in a safe position so that we don't stress the hose never let a caliper hang on its hose it will destroy the hose now let's measure the thickness of our brake rotor always zero out your micrometer and let's check it our amend among specification is 19 millimeters we're at twenty point one eight millimeters so we're still good we're well within the specifications let's check the run out now we've attached our dial indicator always zero out the gauge okay we're at zero let's see what our run out is we have maybe 2000 s run out in this rotor our specification calls for less than 4000 s this front brake rotor is good let's go check the back ok now moving to the rear we have removed the parking brake and rear brake caliper their integrated unit and since there's a cable that attaches to the parking brake we don't need to hang it we're good like that we always want to zero out our micrometer and check our thickness of our brake rotor this one is eight point one five millimeters our specification is no less than 8 millimeters so this is good let's move on and check the run out we've attached our dial indicator and we've zeroed out our gauge now it's important that the rotor stays flush up against the spindle or up against the hub this car has two screws which locate it and hold it firm if not we would simply put spacers and the lug nuts on there and tighten it down a bit let's see what our run-out is ok we can see here that we have less than mm one out our specification is for four thousandths of an inch that looks good let's continue by checking the other side ok now that we put the brakes back together first thing we did is inspect the brake pad thickness and the brake pads were good so the brakes on this car are good to go I like to use Loctite on the on the bolts in the front when you put the calipers back on because it's a safety item and you want to have it insured it's not going to come off and a little bit of Loctite is a good thing well everything is good we've got the wheels torque down let's go for a road test and return this car to the customer

Channel: Innova

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Id: LrQ9PF5F7Mg

Length: 4min 39sec (279 seconds)

Published: Tue May 24 2016