Question about 2006 Buick Grand National
I recently changed my '87 Buick " T " over to vacuum brakes, I used a set-up off an '86 Caprice 10 3/4" booster w/master cyl. All the parts bolted up ok but I had to drill and tap the intake plenum in order to get 16.5-17" vacuum. The pedal is pushed all the way back to it's limit installed. Pedal seems Stiff to push, and is Hard then goes down off panic stops. Will not even lock up front brakes on hard stops. This set-up does not work much better than the Powermaster. Whats going on here???? Any help would be greatly appreciated.
^ Turbo Cars have Lots of Vaccum, Where did you ever get this idea from. I have personally converted 10+ Turbo Buicks to Vac brakes.
Make sure the check valve is okay at the booster. but it does sound like you have a bad booster.
Also, did you change the brake pedal to a Vac brake pedal?
They are not interchangeable.
Also, you should not have drilled the plenum, you can get a vaccum block to replace the plastic one on the top of the plenum with a vac brake port.
Posted on Jan 29, 2009
sounds like the vaccumn canister is not holding vaccumn.( weak or cracked
diaphraim) Also did the swap come with a regulator valve (porposting) to set
rear and front psi? Make double sure the system is bled well.. In addition
the master cylcinder has a shuttle rod that must be centered up in order to
porposition the fluid front and rear.Have a fun day and good luck.
Posted on May 14, 2008
Turbo cars do not have enough vac. for a system like that. Get a vac. pump.
Posted on Jan 06, 2009
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Posted on Jan 02, 2017
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