Question about 2006 Buick Grand National

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1987 Buick grand national intermittent lack of boost to brakes.Not the best stopping power at best and sometimes no boost at all. All new brake lines, new cylinders front, new disks and pads as well as new rear shoes and springs. How do I check the electrical circuit of the four prong plug? what else do I have to check and how?

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Sounds like the accumulator ball on the side of the master cylinder. I don't know how to check it,but what ever you do just don't unscrew it with out knowing what you are doing they have to have the pressure taken out of them by pressing the brakes at least 10 times with the engine off. That thing will take off like a rocket if you don't. Or the simple thing is air in the lines start bleeding from the furthest tire to closest.

Posted on Aug 10, 2009

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If you have bad braking that may mean you have air in the brake system try bleeding.

Posted on Jul 27, 2009

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How do I install a boost gauge on 1987 Buick grand national?

If you have to ask, you may not be competent to do it! Just kidding. Boost gauge is reading intake manifold pressure, so sender can go anywhere between turbo and intake ports into cylinder head. Often you can find a port into the intake which is plugged and not being used.

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I have a 1987 Buick Grand National. The drivers

you don`t say where they keep breaking.if its around the bolts then you can use a thicker washer this might help.if the tracking system that the seat slides on then if there is room you might be able to weld a re-enforcing plate to the system where it cracks to stop it.

Jul 07, 2011 | 1987 Buick Regal

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With motor started and driving, brakes act and feel like no power. On air pressure cover service manual # is 2820134. Fluid is good.

Hello this is most likely your brake power booster this device boost air from the engine to boost brake pressure to your brakes it is located on the other side of your brake pedal under the engine compartment attached to your brake master cylinder brake fluid reservoir.

Jan 08, 2011 | 1991 Dodge Grand Caravan

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1987 buick grand national has brake light on. the peddle is very stiff but with some force it goes to the floor the car has some kind of brake system that does not have a booster it has a black ball it is...

I dont know why you would put a car on stands and put the parking brake on? where was it going to go? Was the fluid low or was there any brake fluid leak? I suspect the proportioning valve may be stuck. Thats why you are not getting fluid to all 4 wheels.

Aug 27, 2010 | 1987 Buick Regal

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1987 Buick Grand National losing power, changed

Symptoms Like this usually point to the Fuel pump.

Also these cars suffer from inferior wiring to the fuel pumps and a substantial Voltage drop is noted between the Fuel pump relay and the Pump harness.

The fix for this is a "Hotwire" Kit

Fuel pump kits with a Hotwire kit are available at numerous Buick performance Vendors but the best stuff in my opinion come from Racetronix,com

You should also change the Prom Chip in the ECM to a modern
Chip from Turbotweak.
This will improve driveability greatly.


Aug 14, 2009 | 2006 Buick Grand National

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Put new fuel pump in 87 buick grand national now it will not turn over

i have a 1987 buick grandnational and put a new fuel pump in and the car will run about 5 min then just shut off

Aug 13, 2009 | 1987 Buick Regal

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Buick Grand National vacuum brake conversion

^ 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.

May 14, 2008 | 2006 Buick Grand National

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