Quote:
Originally Posted by j cAT
I removed the pistons measured them worked them in and out of the cal bore by hand. so not guessing on what was what ...
my thinking is the abs activation pulses these soft pistons then they bow out in the middle hanging up on the weather seal.
both pistons the same damage distortions.
got new calipers poped out pistons checked for any defects they were perfect. bore had some dirt cleaned with some air then wiped down with alcohol.
brakes worked great still no problems.
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The ABS only activates if you slam on the brakes and the car can sense the wheels are going to lock up. 99% or more of the time, ABS doesn't do anything. Your car just works like a car that doesn't have ABS. Each hub has a sensor on it. Then it talks back to the master cylinder and causes it to releave pressure in the lines to let up on the brakes... but it's only if the brakes are about to lock up.
One thing I've never understood about the system though is how can the car tell the difference between the wheels locking up and the car just being at a stand still? Either way the car's wheels aren't moving. That I've never known.
For instance if you're going really slow on ice and then slam on the brakes, the ABS activates (you hear it working) and lets up on the brakes. But if you're going slow on dry ground and slam on the brakes, ABS doesn't activate. When you're on ice, how does your car know it's on ice and slipping instead of on just dry ground and the car not moving?