Anyone familiar with Powermaster brakes?

[rimtrim]

I just did some major brake work on my '86 Pontiac Parisienne -- new calipers, new stainless steel lines, new flex hoses, new proportioning valve and new wheel cylinders. The problem is that I can't get the brakes to bleed properly. I am not getting significant amounts of air out of any of the bleeder valves at the wheels anymore (I got lots of air at first as expected, then clear fluid), but when the car is running, the pedal is mushy and the BRAKE light flickers. The booster motor cycles at every brake apply, when it is supposed to cycle every 3-5 applies. These are the electrically boosted brakes with the big booster motor that sits below the master cylider -- not a regular vacuum boost system. I believe they were used on 1986-87 GM wagons and Buick Regal Grand National/GNX/T-Type. Is anybody intimately familiar with these brakes? Is there a secret trick to bleeding them? I am starting to suspect that the accumulator has failed, but it was fine before... -Andrew L

[flacajun]

you are correct the acculmator is bad.

[Drew Dowdell]

I am starting to suspect that the accumulator has failed, but it was fine before...

-Andrew L

[post="29899"]<{POST_SNAPBACK}>[/post]

Your hunch is most likely correct.