Question about 1994 Pontiac Grand Am

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1994 Pontiac Grand Am Brake pedal sinks to floor.

I'm having an issue with fixing my sister's car. The pedal sinks to the floor and i'm not sure what it can be . We replaced the calipers, master cylinder(bench bled it), wheel cylinders, replaces a line that broke while putting in the wheel cylinders, and bled it som many times and it did nothing. The drums looked fine and i know that the rotors will need to be replaced in a few months, but what can be causing this problem? I don't think it's the booster since most of the time a bad booster causes the brake pedal to be harder to push.

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Sounds like a bad or empty Master cylinder or slave brake system leakage . Check the master for full brake fluid. Look for leaks at each wheel.
Maybe the system has to be bled.
Hope this helps.

Posted on Mar 14, 2015

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  • Contributor
  • 16 Answers

I've had the same problem before, ended up being a bad master cylinder that I just purchased. Replaced it with a different brand and it worked fine.

Posted on Apr 23, 2013

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Posted on Jan 02, 2017

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SOURCE: Is the brake booster going out?

Let me know what you find out. I get the same whoosh/pedal travel, and at this point have NO braking at all. I am also losing fluid nearly as fast as I can put it in if I use the brakes, but I can't find where it's coming out. I even drove on clean snow and don't see any fluid tracks...

Oddly enough if you are going to do it yourself, gmpartsdirect seems to have the best prices for OEM parts.

I am assuming that my rusted/pitted brake lines have failed me. Aaahhh the old money pit.

Posted on Jan 13, 2009

  • 1779 Answers

SOURCE: bleed brakes but no pedal

Good! You bled the master cyl. before installation! The proper order of bleeding the lines, is to start with the wheel the greatest distance from the master cylinder. Then work your way to the next greatest distance, and last, the closest wheel. Make sure all air is removed from the lines before you proceed to the next wheel, and frequently check the master cyl. level, because, as I'm sure you know, if you **** in air at the master, you have to start all over again. I'm assuming you don't have a power bleeder, so with a helper do this with car running (make sure it's on safety stands and not going to fall on you!) Pump pedal 3 times, no need to mash the pedal into the floor, just 3 pumps 1/2 way down, hold 3rd pump at half way down level while bleeder is opened, when flow is about to stop at bleeder, close bleeder and repeat til no evidence of any air. Let me know how it goes and if you need any help.

Posted on Apr 21, 2009

cadman000
  • 607 Answers

SOURCE: 1999 Pontiac Bonneville SE 3800 ABS Brake pedal will eventually reach floor after stopping while hold car stopped. Brake pads replaced less than 5000 miles ago. Fluid level at max and does not drop. O

I would replace the MASTER CYLINDER. BLEED AIR from master cylinder BEFORE INSTALLATION. Hope this helps

Posted on May 18, 2009

  • 98 Answers

SOURCE: 1996 Grand Am, no leaks in brake lines, replaced

Not bench bleeding is a big mistake. You have to bench bleed. I know you dont want to hear this but your gonna have to take that master cylinder back off and bench bleed it. I hope you dont have a.b.s. cause if you do you just pumped it full of air. If that is the case you are going to have to pressure bleed it at a repair shop. after you bench bleed use this process to bleed your brakes start with the wheel farthest from the master cylinder have someone pump the brake pedal slowly about seven times then hold it to the floor. then you open the brake bleeder and air and fluid will come out. then close the bleeder make sure your assistant holds the pedal down to the floor the whole time until the bleeder is closed then have them pump the pedal again another seven times and hold it to the floor open the bleeder then close it again. keep doing this process until you see a clear stream of brake fluid coming out without it spitting air you will be able to tell the difference when the air is gone. then proceed to the next wheel farthest away from the master cylinder. make sure you keep the master cylinder full of fluid while you are bleeding dont let it go dry.

Posted on Nov 01, 2009

MechxD
  • 87 Answers

SOURCE: I have a 2001 Pontiac Aztek. My brake pedal goes

After replacement of any brake componet that requires opening the lines (Brake lines, fluid loss) you have to bleed air out of system. In addition a master cylinder replacement requires a bench bleed before attaching to vehcile.

Posted on May 12, 2011

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Have the engine running & bleed the brakes again

Have someone in the vehicle slowly push the brake
pedal,never pump.

When you are driving, do you pump your brakes,NO

Pushing the brake pedal only moves the piston in the
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That amount of movement will build up to 2,000 lbs
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