Brake pedal sinking...
08-25-2021, 10:58 PM
#1
Three Wheelin'
Thread Starter
Brake pedal sinking...
I swear.if I hold the brake hard at a light rather than using the brake hold, I can feel the pedal sinking...Reservoir is full !!
Anyone else ??
Anyone else ??
08-26-2021, 08:35 AM
#2
RL Community Team
Rennlist Member
Rennlist Member
That's a Classic symptom of either a failing master cylinder or air in the lines.
08-26-2021, 10:25 AM
#3
Rennlist Member
Does the e brake apply itself at the same time you are pressing hard? This could be the "hold" feature.
08-26-2021, 10:51 AM
#4
RL Community Team
Rennlist Member
Rennlist Member
I've been told the hold feature isn't actually done by the brakes, but is internal to the transmission, which is why it take some power to overcome the hold and you can feel it release.
08-26-2021, 06:34 PM
#5
Both of my 970 Panameras have done this from day 1. My guess is there is a pressure relief somewhere. You can press hard, sinks a bit then stops, then press hard again sinks again.