Currently running a 3400 stall and 3.8 turbo buick engine in my 86 GXL

Recently had my car up on 4 jackstands. I noticed that when I have the brakes depressed to the floor and I press the gas the rear wheels begin to spin very easily, before I even hit boost. If I pull the ebrake it gets a little better but it seems the ebrake is only holding the driverside wheel.

Is there anyway to increase the strength of the ebtake or pressure going to the rear brakes? I'd like to build boost offf the line for launches.

Thanks!

 

If you made the rear brakes strong enough to do that, they would lock up every time you braked. That'd make driving on the street fun...

 

They shouldn't be *THAT* weak...

Can you lock up all 4 tires on dry pavement? If not (and, hey, maybe even if you can), you'll want to adjust the brake pushrod. You can either do this from inside the car (on the brake pedal), or by taking off the vacuum booster and adjusting the nut on the end of the pushrod.

Extend the pushrod slightly, and test the brakes. If you extend it too much, your brakes will drag even with the pedal up, and that causes all sorts of nasty problems. Check them with the engine running and the car up on jackstands - the wheels should still spin freely with the pedal up.

Also, what condition/type are your brake pads? If they're fairly badly worn generic street pads, that may be part of the problem.

-=Russ=-

 

So what are some good "race" non-geberic pads that might work a little better? I will adjust the brake rod this weekend.

Thanks!

 

The rear brakes receive less hydraulic pressure than the fronts, due to the proportioning valve in the brake system. The fronts do most of the work because when you step on the brakes, the car's weight is shifted forward onto the front wheels. Equal pressure throughout the system would cause the rears to lock up due to the light loading on them.