Question about 1995 Pontiac Grand Am

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The brakes were working just fine then all of a sudden they became so sensitive that they lock up with the slightest pressure on the pedal. what could cause this and how do i fix it?

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  • yadayada
    yadayada Aug 26, 2010

    do u have any ABS or Brake warning lights on?


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This symptom is typical of a leaking slave cylinder inside a drum brake. The leaking fluid causes the drum to stick and lock the wheel. If you have drum brakes, pull both drums and check for leaks at the cylinder.

Posted on Aug 26, 2010

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I have no brakes

When you say that the first master cylinder had no pedal, did that just suddenly happen?

A master cylinder has rubber seals inside - think of a bicycle pump - when the bicycle pump seal wears it becomes difficult to pressurise it. The same is true of a master cylinder.
A classic sign of a master cylinder with worn or perished seals is that it needs pumping a few times to pressurise but there is no leakage of brake fluid.

Prior to you changing the master cylinder had the level of the brake fluid dropped .. indicating a leak somewhere? Had you done any work on the brake pads/rotors?

Eliminate other causes of air getting into the braking system:

First thing to do is check the flexible brake hoses on each wheel. Get a friend to pump - and hold - the brake pedal while you inspect the flexible hoses. Check for leaks (obviously) but also look to see if each flexible hose 'bulges' anywhere along its length.

25932867-jil1jjwvkur0lkeilf3pe4be-4-0.jpeg Also check each flexible hose to see if it is perished or wet with fluid. 25932867-jil1jjwvkur0lkeilf3pe4be-4-1.jpeg A perished flexible hose can draw in air and cause no pedal/spongy pedal. The same is true with a flexible hose that bulges/balloons when under pressure.

It only takes a slight 'weeping' from a flexi hose or rigid pipe connection to allow air into the system. Check the rigid brake pipes too - especially where there is a connector/join.

Then remove the road wheels and look for the slightest fluid leak around caliper pistons.

The problem, I think, comes back to the original fault .. no pedal when your car had sat overnight. This is rather indicative of air getting into the system somewhere though not necessarily from the master cylinder.

Check for the slightest leak in the entire braking system. It only takes a small amount of air to get in and cause problems. The fact that you fitted a second master cylinder makes me think the problem could lie elsewhere.

Try bleeding the braking system. It's a 2 man job, but quite easy.
Here's a link that explains how to do it:
How to Bleed Your Brakes

Good luck!

Oct 30, 2015 | 1988 Plymouth Reliant

1 Answer

No speed when gas pedal is to floor tranny light came on

With the oil light coming on and the brake pedal being hard to press I would say that the engine stopped hence no vacuum -no power assist from the booster.- hard brake pedal. The lock uo feeling may come from the engine seizing up while you were still in gear

Feb 02, 2013 | 2003 Jeep Liberty

1 Answer

I've had my 2008 ford focus 1.6si for 7 months now and never had a problem with the braking system. A week ago my bad luck changed. Whilst I was driving and braked for the stop sign the brake pedal all...

Hello, The Vibration in the brake pedal was likely the Antilock brake unit starting to work. It works when the 4 wheel sensors detect that the wheels are moving at different speeds from each other. This reduces skidding and pulling from a locked up wheel.

You need to have the Brake pads checked for wear. The rear brakes can have an additional problem because there are 2 sets of brakes in back, the Service brakes and the Emergency brakes. Sometimes the pads come unglued from their mounts and jiggle loosely in their holders.

Your Brake booster is also questionable along with the Master cylinder. This can explain the lack of power assist when you press on the brake pedal. While your problem can be all of these things, if only 1 or 2 are bad, you may not need to buy everything.

There are electric tests available for the ABS unit for Diagnosis. The rest require a manual and visual evaluation. I hope my Solution is very helpful towards fixing your problem.

Jul 19, 2011 | 2008 Ford Focus

1 Answer

1992 Pontiac GrandAm has power brakes, front disc, back drums. Everything worked fine up to leaving the car sit on the street for 2 weeks, now back brakes seem to lock up at the slightest touch of the...

Sometimes a caliper or wheel cylinder will sieze, usually temporarily. This puts twice the amount of pressure on the other side of the system. Recommendation: turn your car on, take off the parking brake, and press really hard on the brake pedal. This will usually break the offending piston free, and you will be good to go for a long time. If this doesn't work, then you'll have to figure out which one it is, and change it out. Hope it works for you.

Dec 01, 2009 | 1992 Pontiac Grand Am

1 Answer

98 Chevy c2500 rear brake lock up

No axle gease at all on the shoes. Or brake fluid? Have you tried loosening the adjustment a turn.

Jun 14, 2009 | 1998 Chevrolet C1500

1 Answer

Brake probleme

It may be an internal leak in the master cylinder which will allow the pedal to go to the floor with no loss of fluid. I hope this helps.

Apr 26, 2009 | 2005 Dodge Caravan

2 Answers

1991 Buick Park Avenue and no brakes!

hi do you have a good pedal. or does the pedal go to the floor

Apr 19, 2009 | 1991 Buick Park Avenue

1 Answer

Ford Bronco II spongy brake pedal

if the booster is bad the pedal would be hard sounds like the e-brake is stuck take off the drums and make sure the arms are all the way back then did you adjust the rear brakes after changing the shoes

Dec 14, 2008 | 1989 Ford Bronco II

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