The car is an '87 GN bone stock and my Wife and I are the original owners. Its her (and the kids) daily driver so this is a real safety issue for us.
I recently did the vacuum brake conversion because I was having so much trouble getting another powermaster. Had almost as much trouble trying to get a new hydro-boost as well so went with vac. Bought a new booster and master cylinder from Autozone for an '84 Buick regal. Did the pedal mod myself and it all fit nicely and seemed to work very well. Ran the vac line to a tee off the PCV valve as mentioned several times here in the forum. Overall the brakes work well although a little touchy compared to the powermaster.
Yesterday she was backing out of a parking lot and stepped on the brakes and the pedal was rock hard. Could barely stop from rolling into another parked car. The only other issue she remembers is that the car was idling rough and almost stalled. Then, she tested the brakes several times and they seemed to have come back. She proceeded out of the lot down a small incline and tried to stop just before pulling out into traffic, pedal hard again. She had to "STAND" on the pedal to keep from coasting into on-coming traffic. The kids were with her and she is now freaking out about the car.
Of course EVERY time I drive it its fine.
Any Ideas? Bad vacuum check valve? Wrong booster?
Please advise....
Rick
I recently did the vacuum brake conversion because I was having so much trouble getting another powermaster. Had almost as much trouble trying to get a new hydro-boost as well so went with vac. Bought a new booster and master cylinder from Autozone for an '84 Buick regal. Did the pedal mod myself and it all fit nicely and seemed to work very well. Ran the vac line to a tee off the PCV valve as mentioned several times here in the forum. Overall the brakes work well although a little touchy compared to the powermaster.
Yesterday she was backing out of a parking lot and stepped on the brakes and the pedal was rock hard. Could barely stop from rolling into another parked car. The only other issue she remembers is that the car was idling rough and almost stalled. Then, she tested the brakes several times and they seemed to have come back. She proceeded out of the lot down a small incline and tried to stop just before pulling out into traffic, pedal hard again. She had to "STAND" on the pedal to keep from coasting into on-coming traffic. The kids were with her and she is now freaking out about the car.
Of course EVERY time I drive it its fine.
Any Ideas? Bad vacuum check valve? Wrong booster?
Please advise....
Rick