Question about 1987 Buick Regal

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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 a acumaltor i think it is not leaking the car was put up for about 14yrs it only has 21600 miles on it i tryed to bleed the brakes fluid looked a little dark on the left rear no fluid would come out the bleeder and on the right front at first same thing but after letting it sit open for maybe 15min. it started to flow but the left rear never did i checked the lines all the way up they look almost new nothing looks pinched what is wrong car ran great when i put it up it was put on stands and covered in the back of my shop indoors with air and heat started it maybe 1to2 times every 6 months don't know when the problem started as the parking brake was on everything else is great runs feels and sounds great does not stop worth a **** pads liners calibers and drums look good help

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First off ...NICE CAR!
As I recall the grand national and a few other lucky? cars had what is called hydraboost. This system uses power steering pressure from the pump to provide assist to the brakes. All in all kind of a good idea but turned out to be a crappy design. These boosters have a high failure rate. If you scope out ebay you can find replacement boosters or you can purchase a conversion kit to get rid of the hydraboost system and convert to a standard vacuum assist system. Good luck!

Posted on Aug 27, 2010

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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.

Posted on Aug 27, 2010

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Your brake fluid is more than likely contaminated. 14 yrs is a long time. you did start off bleeding it from the back first right? farthest away from the master cylinder. take the back brake line off see if fluid is going through the line. if so take the caliper off and clean it out. the bleeding nipple could be jammed or thecaliper could be frozen too. try that!!!! start bledding from the farthest wheel till fresh brake fluid comes out. good luck

Posted on Aug 27, 2010

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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...

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.

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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.

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