Question about 1999 GMC Safari

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When i push on brake pedal i get pressure back against my foot and noise like a motor is kicked on under hood

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The motor noise is your Anti Lock Brake System working...

Posted on Sep 28, 2010


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How do you know that a brake booster is bad?

Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

Jun 21, 2014 | 1993 Cadillac DeVille

1 Answer

Pulsating brakes and peddle pushing back up

This is a classic ABS problem. Either the pump or the ABS controller. But as it is causing the brake pedal to push back you should get it seen by a qualified mechanic and DON'T drive it until it is fixed.

Jul 15, 2013 | 2002 Chevrolet Silverado

1 Answer

How do I set the brake light switch?

switch should be located on the metal piece above your brake pedal under the dash. Follow the metal brake bar to the top and there should be an electrical switch mounted there. when you dont have your foot on the brake the switch should be depressed against a bracket. When you push the pedal down the switch should no longer be depressed.Tha'ts how your brake light circuit works. Sometimes they can be adjusted. But most of the time you have to replace it. They are not hard to change. Just in a tuff spot under the dash. Before replacing the switch you should try turning the piece that makes contact out farther to try and add more pressure against the metal. I don't know if you turn clockwise or opposite.Try counterclockwise first. Good luck

Jul 22, 2012 | 1991 Buick Regal

2 Answers

What is the master cylinder

The brake master cylinder is the device that supplies hydraulic pressure to the brakes when you press the brake pedal. It is located on the drivers side of the vehicle under the hood back by the firewall. It is under the brake fluid reservoir. Let me know if you have any questions and I'll do my best to answer them. Thank you for using!

Feb 02, 2012 | 1996 Ford Taurus

2 Answers

Manual Transmition, While driving the clutch pedal went right to the floo and stayed down. I lifted the pedal with my foot and with a light touch i pushed down on the pedal and it it began a grinding sound...

the slave cylinder on the trans works just like a brake cylinder, when fluid pressure is applied it flows into the cylinder and pushes against a clutch fork which engages a throw out bearing against the clutch pressure plate fingers. a couple things could have happened. I think your trans is fine but im sure the clutch fork or the pressure plate broke. I'm sorry but the trans is gonna have to be pulled. best wishes

Feb 03, 2011 | 2000 Isuzu Trooper

2 Answers

Where is the fuel pump cut off switch on a 1996 Ford F150

the cutoff switch is located behind the passenger foot well kick panel there is a hole to access the button u push down to reset the switch

Aug 16, 2010 | 1997 Ford F350 Crew Cab

1 Answer

Brake pedal pressure "whistling" whether totally stopped or braki

There is a seal where the rod from the booster connects to the foot pedal that is probably leaking

Jul 26, 2009 | 1999 Chrysler Town & Country

1 Answer

Brake lights stay on 1991 Lexus LS 400

Simple fix... Just replace the brake light switch. It is located on the brake pedal arm about 6 inches above the pedal, it will have a plug going to it as well.

Jul 04, 2009 | 1991 Lexus LS 400

1 Answer

My front tire is sqeeling and somtimes my car putts when i'm on the highway and sometimes there is smoke from the tire area but not under the hood what is it and what can i do to fix it

"squeal" noise could be low tire pressures, or even low brake warning sensors on the brake pads. Squeal with foot OFF of the brake pedal, and goes away on brake application. Hope this helps

May 03, 2009 | 1996 Buick Skylark

1 Answer

Bad Brakes

I would be looking at the ABS valve. one way to test the booster is to start the vehicle while you ae depressing the brake pedal, you should feel the brake pedal drop a little bit, this is a sign that the boostr is working properely. you may want to check to see if there is any air in your system as well.
hope that this helps.

Oct 16, 2008 | 1996 Chevrolet K1500

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