Intermittent Brake Pedal Fade
 

Hi Everyone,
Well we are planning on getting rid of the S80 if I can get the damn thing in sellable condition. We have had a problem recently with an intermittent fade in the brake pedal. Usually occurs when applying the brake gently/slowly I.E. creeping up to a light or something but not always. Happens maybe 1 in 8 applications. When applied in more abruptly, the brakes feel fine. Could this be a master cylinder having issues? I also had the traditional ABS module rebuild. Could that be affecting the brakes?

Thanks ahead of time for the info.

Bill