Brake pedal buzzing/vibrating?

[Ed Valvo]

When depressing the brake pedal to stop, I sometimes get a buzzing feeling or slight vibration like the power master is working. Is this normal? The brake light does not come on.

 

[Ed Valvo]

So I looked at my volt gauge in the car and it's fluctuating every time I feel the pedal vibrate. I pop the hood and the PM motor smells bad. Brake light never turned on though. Could it be the switch since the brake light never turns on? I figured the switch may be bad and telling the motor to run too much. I feel the pedal buzz every few seconds. Car stops fine but my volt gauge is going crazy from the thing turning on all the time.

 

[gofstbuick]

Ed,
maybe the mastercylinder needs to be rebuilt. The checkvalve may be failing. I'll be at the Cops&Rodders car show (CHP Academy, W Sacramento) this Saturday. I can bring my brake gauge assembly and you can do some test. The brake gauges are the best method to pinpoint a hydraulic problem in the PM system.

 

[Ed Valvo]

Thanks for the offer. One thing I have is little time. I did change the accumilator and it sucked in half the amount of fluid that the old one did. It also only took 9-10 seconds to fill it up vs the 15 seconds with the old one. I'll drive it soon and let yall know. Next is pressure switch. I figured since I need these for spares anyway, I'd try them. Brakes seem better now but not enough driving time.... Again thanks for the offer. I just might take you up on it if I can't fix it.