Question about 2001 Buick Century

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RE: 2001 Buick Century power booster

If I disconnect the vacuum hose from the booster, the brake pedal doesn't fall to the floor.

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It is not suppose to fall to the floor when that happens.

Posted on Sep 28, 2009

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Why should it. All the vacuum does it make it easy to push the brake. That's why it called power brakes.

Posted on Sep 28, 2009

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It is not supposed to. What is wrong with car?

Posted on Sep 28, 2009

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Related Questions:

2 Answers

When engine starts brake pedal is sucked to floor, can't pull it up. eventually it comes up.


Year make and model, and did you try it with the vac booster hose disconnected ?

Jan 05, 2016 | Cars & Trucks

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.

Sep 02, 2015 | 1997 Buick LeSabre

1 Answer

Power booster seems to leak how to fix


These are not rebuild-able, they must be replaced if they leak.
One that leaks will hiss while the engine is running. The hiss is vacuum leaking, not pressure leaking out.
To possibly check it under the hood, be very suspicious of a leaking vacuum line at or near the booster, not the booster itself. It might be bad, but that is pretty rare.
The last one I changed I thought was defective because it hissed when I applied the brakes, but a new one did the same thing! :-(
If you decide to replace it, you will be unbolting the master cylinder from the unit under the hood, and also unbolting the unit under the dashboard.
Of you are really careful, you might not need to disconnect the master cylinder 's brake lines at all, just gently pull/push it out of the way to change the booster.
Be really careful not to kink the brake lines.
The unit is bolted to the car with usually 2 bolts through the firewall behind the brake pedal.

Jan 12, 2013 | 2002 Buick Century

3 Answers

Are there vacuum hose on the brakes hydraulic system?


NO. the vacuum is used to make the brake pedal easy to push, power brakes. the pedal would be hard without vacuum, that is why the pedal gets hard with the key off and engine not running. the problem you are having is more of a hydraulic problem.
Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.

Dec 07, 2012 | 1997 Ford Probe

1 Answer

1999 Buick Century Custom _ Brake Problem My 99 Century has little to no assist and it makes an air hissing sound when depressing the brake pedal. I think that this means that I have a faulty brake...


nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.

Jun 11, 2011 | 1999 Buick Century

1 Answer

When applying the brakes I hear a loud noise like air coming through the lines do I need a vacuum booster


If it takes time to stop the car and the pedal is to the floor when braking, YES replace the booster

Jun 05, 2010 | 1991 Buick Century

2 Answers

2001.5 Dodge Ram Diesel 2500 4x4 Brake Pedal drops to floor


It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.

Apr 21, 2010 | 2001 Dodge Ram 2500 Truck

1 Answer

Vacuum leak /Power Booster problem?


Sounds like your Power Booster is bad.

Nov 28, 2009 | 2002 Buick Century

2 Answers

A few seconds after brakes are applied the pedal starts to fall to the floor. When I pump the brake pedal I here a hissing noise coming from the vacuum booster.


you have two problems here, your master cylinder has a leaking seal, the low pedal is resault, the power brake booster rubber diaphram is damaged and leaking from the brake fluid that is getting into it from the master cylinder, these are sold as a unit that has been rebuilt.

Sep 28, 2009 | 2001 Buick Century

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