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Old 06-19-2018, 02:55 PM   #9
FC
Solving problems
 
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Join Date: Oct 2003
Carmudgeonly Ride: M5 / 718 GTS / Cooper S / GTI / LR4
Location: Metro Boston
Posts: 25,216
Quote:
Originally Posted by rumatt View Post
If I put race pads on the car, drive around for a while, and the vibration is gone then it blows a hole in the damaged caliper theory, right?
EDIT: Yes, likely. But at that point I'd be out of ideas as to what is causing the issue. I am not an expert in braking systems at all. But here is my analysis nevertheless from what little I know.

The pulsating thing can only be caused by one of two things (as far as I can think of right now):

1. Something is causing you brakes to wear unevenly and and you are feeling the uneven surface as it comes around every revolution.

2. The hydraulic pressure itself is going up and down. I don't know enough to postulate a reasonable theory for this could happen, so I am gonna conveniently ignore this possibility.

So on to things that can warp your rotor:

A. Uneven wear due to uneven pressure as I explained on the post above.
B. Thermal shock if you splash your (VERY hot) rotors on a deep puddle.
C. Intermittently sticking capilers. Weird, and unlikely without you noticing something is really wrong.

Last edited by FC; 06-19-2018 at 03:13 PM.
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