Smith's Transmission Repair

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Brakes



Brake pedal pulsation, what causes it and how to prevent it.
 

The cause of brake pedal pulsation is uneven brake rotor thickness which in turn is caused by excess lateral run-out.
 
While driving and the brakes are not applied, excess lateral run-out causes the disc rotor to strike the brake pads with every revolution of the wheel. It’s this constant striking that wears thin spots in the rotors.
 
While driving and the brakes are applied, a rotor with uneven thickness causes the caliper piston to extend and contract as the disc pads pass over thinned spots in the brake rotor. This cycle repeats itself with every rotation of the wheel and can be multiplied for every wheel with this problem.
 
So now let’s address the root cause of lateral run-out.

The truth is that lateral run-out is almost impossible to completely eliminate and is acceptable as long as it is kept to a minimum of .001 an inch (measured at the outer edge of the rotor surface)
 
Things that cause excessive lateral run-out

Hub bearing assembly run-out
Machining differences in the hub matting flange and the rotor surface of the disc rotor
Rear axle shaft hub flange run-out
 
How to correct lateral run-out


Machining the rotor surface while the rotors are mounted to there respective hubs will compensate for any minor irregularities in rotor, hubs and axle flanges. This process is called rotor matching and will correct lateral run-out to less than .001 of an inch.






 706-795-0017
Our current brake special 
We will install new disc brake pads and machine front or rear disc rotors with our new Pro Cut 9.2 DRO on the car brake lathe.This process will match the rotors to your wheel hubs giving you the best brakes possible with shorter and smother stops! All for $99.95 Semi-metallic or $119.95 Ceramic
 No gimmicks, just quality brakes at an affordable price