Question about 1999 Buick Century

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HArd brake pedal and low stopping power after changing brake booster

Is ther a difference in power brake booster

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Look between master cylinder and brake booster if the little pin is there in the middle. you definitely have a booster problems or vacuum
hope it helps

Posted on Mar 24, 2014

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As with any replacement of a brake component that involves removal of a part that will introduce air into the line. Did you check to see if you have air in the line, if so you will need another person to pump the brake will you remove the air from the line from the brake booster, you will have two lines, usually for front and rear, so start there and see if that resolves your problem.

Posted on Mar 25, 2014

  • Denis Houle
    Denis Houle Mar 25, 2014

    two things ,first hard pedal is no brake assist,,,,,air in line is a sponge feel of brake pedal

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Posted on Jan 02, 2017

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SOURCE: hard pedal low stopping power

Poor braking may be due to severely worn pads (disc brakes) or shoes (drum brakes), however, a common cause of "sudden" hard braking is the power brake booster either losing vacuum or failing, causing the brake sytem to lose the assist the booster provides and requiring a stronger effort by the driver to slow or stop the car by "standing" on the brake pedal with much greater force.

Posted on Jul 19, 2008

  • 31 Answers

SOURCE: 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.

Posted on Jan 29, 2009

  • 2 Answers

SOURCE: intermittant, low speed, hard brake pedal, no stopping

check for brake booster hose off

Posted on Apr 19, 2009

  • 35 Answers

SOURCE: Vacuum leak /Power Booster problem?

Sounds like your Power Booster is bad.

Posted on Nov 28, 2009

  • 466 Answers

SOURCE: brake cylinder leaks at booster

you need a brake booster

Posted on Dec 25, 2010

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1 Answer

Fleetwood problem


Pretty normal to not be able to lock the brakes without the assistance of the booster, it'll take a lot of pedal pressure without it. It's also normal for the pedal to feel harder without the booster, this goes for any car/truck with power brakes. Try it with any other car you have and you'll see.

I've worked on several old Cadis but don't recall what year they started using front disc. If it's been changed from drum to disc you'll likely need a different proportioning valve and possibly a different master to get them to work right. Talk to the seller and ask if the brake feel changed when they replaced the master and if they changed any other parts.

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HArd brake pedal and low stopping power after changing brake booster


I had my power brake booster go bad and I replaced mine as well as bleed the brakes that when I went and tried them out 'I slammed on my breaks early before getting to close to the light' that my car left skid marks all over that road because the brakes worked like power brakes should and yours sound like your booster was installed wrong or the pads are bad or you didn't bleed all the air out of the line. Your problem you described was like it felt before I replace brake booster ie lousy non power brakes when I had power brakes.

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Brake booster vacuum hose , inspect that, if the hose is good then brake booster has went bad.e1320de5-8a99-48ed-84e9-c42d2e2274cb.jpg

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Lost power steering fluid while fast driving , now have no leaks but hard steering and hard brakes


With no oil to lubricate the gears in the pump I would say that you will have to replace the power steering pump as it will be damaged internally. As to the brakes well that is a different problem and the thing that makes the brakes hard and I take that you mean hard pedal to push with little brake action is there is no power assist from the brake booster, Check for blocked vacuum line or faulty booster . If you mean that the pedal is easy to push but the car is not stopping then check the pad thickness and if under 3/16 thick have them replaced.

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2 Answers

Hard brake pedal


Check The Hose Leading To The Brake Booster For A Leak. If Good Check The Check Valve To Make Sure It Working (Sucking In Air) If Good The Brake Booster Needs Replacement.

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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.

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1 Answer

Vw golf 2000 the brake pedal is to soft when you apply it and seems like is not going to stop but it does, what is the problem?


Not sure if you have done all this.



BRAKE BOOSTER INSPECTION

Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
1. Depress the brake pedal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty
2. With the engine stopped, depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. On consecutive applications, the pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

Check valve test:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be a vacuum available. If no vacuum is available, the check valve is not working correctly. Replace the check valve and retest.

END TEST

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1 Answer

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.
You may need a second opinion from a different shop.

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Have a 1993 dodge Caravan SE. Purchased it from a man which converted it from ABS to hydraulics. I didn't know it had brake problems till i got it running. He put on a 3 outlet 2 inlet proportional...


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2 Answers

Hard pedal low stopping power


First you need to check the brakes lines and the brake pads must be replaced on your car they may be worn out........ Get it checked from the local service center........

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