Question about Buick LeSabre

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On a 1997 Buick Lesabre, what usually happens when the brake booster is going bad? My reason for asking is because my car shuts off at the end of the day, idles up and down, up and down when cruising on the freeway. I was told by my mech that brake booster vacuum is what is making my car shut off, but other mechanics are telling me to replace my MAF, or MAP. Before i go out and spend this money, is there anything i can do to figure out which one is bad or does anyone have any idea what i can do.. i really cant afford to buy both so i would like to invest in the right part... thanx in advance..

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Typically when the brake booster goes bad an indication would be a rock hard brake pedal that you would have to apply overwhelming pressure on the brake pedal to stop the vehicle if it is leaking vaccum.Something you can easily try would be to temporarily remove the cover over the engine which just requires you to take off the oil fill tube which unscrews like the cap.Take that cover off and follow the air induction tube that runs from your air cleaner to the throttle body.Right on top of the throttle body should be the mass air flow sensor unplug it and start the vehicle too see how it then runs.If it smooths out then there is a definite problem with the mass air flow sensor (maf).It should take just a few minutes to verify this yourself and if it does need the maf sensor replaced it is pretty easy to do as well.There are just 2 tamper proof torx holding it in place.The maf sensor looks like just a rectangle about 2 1/2 inches long x abount 1 1/2 inches. It is a very common problem on these engines. Unplugging will turn the check engine light on. Please feel free to ask any other questions.Will be glad to help out.

Posted on Sep 02, 2010

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1 Answer

How do I remove brake booster?


disconnect the vacuum hose to the booster, then disconnect unbolt the master cylinder from the power booster(2 nuts) remove the cylinder from the booster by sliding it off the studs. inside the car under the dash disconnect the brake pedal from the booster rod and undo the booster mounting nuts/bolts there is 4 or them.

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Brake peddle should be hard, if bake peddle soft check master cylinder or replce, try bleeding brake system too. Ceck if check valve is bad this is located on vacumm line from intake manafold to booter pump body. brake seal at check valve booster pump should hiss if not check vaccumm line for leaks if no leak in line replace check valve they don't cost much.

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1993 buick lesabre changed the front rotars and pads and now the cars brake pedal is so hard to push down to get car to stop. Mechanic has checked both the front and back brakes and they are fine. T


I would jack up a front wheel and see if pushing on the pedal with the engine running will stop the wheel from turning.
You need to know if the pressure is reaching the wheels, or if the pads and rotors are too slick to stop the car.
Usually if the pedal is hard, the booster is not working or the brakes are glazed.
Can you stop the car with the parking brake ? That only uses the rear brakes.
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1 Answer

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its usually a bad brake booster that makes pedal hard or stiff. just type in on computer, ' power brake symtoms " in search bar. this should lead you in the right direction.

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1 Answer

I was told my 1990 Buick LeSabre has an electric hydroboost brake system and the hydroboost unit needs replacement. Does anyone know anything about this system and where I can get this part?


Unless you have some wierd oddball modified car......its a vaccum booster, not electric. Usually if they go bad, you will have a hard brake pedal and/or hissing noise when pushing the brake pedal .

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1 Answer

I need a new brake booster for my 89 LeSabre T Type. I i don't know if I need the entire thing or just the cylinder. I have no pressure with my brakes, even with the brake fluid full. I know i have a leak...


booster rarely go bad and when they do they make a vacuum sound in the car see if vac hose is going to booster from top back of engine 2 booster if that is got vac . but the leak in the brake line is a bigger danger and you cannot diagnose the master or booster with out fixing that leak first &bleading the brakes

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