Question about 1996 Chevrolet K1500

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Bad Brakes Brake pedal is hard to depress and also pushes back against my foot when I try to stop sometimes. It doesn't do this all the time though oh and it make a hissing noise also. Sometimes it will pushes back hard and then the truck is almost stopped then the brakes come on hard and stalls the motor? I was thinking it might be the booster but all the lines are conected and when I shut the truck off and wait 90 seconds then hit the pedal I have power brakes, so the booster isn't leaking. Maybe the proportioning vavle, I don't know and it has a lot of wires going to it also. If I disconnect the ABS wire it doesn't seem as bad? Please HELP!!!!

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  • Joshua Ector Oct 16, 2008

    Is there anyway to test the ABS valve?

  • Anonymous Mar 22, 2014

    my brake pedal is hard to press and a load hissing noise is heard when i press it. the code that is found is p0507. fuel trim st and long are at max. when I accelerate the trim goes down. I think that this means a vacuum leak. In the brake system?

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  • 231 Answers

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.

Posted on Oct 16, 2008

  • Fred Kenmuir Oct 16, 2008

    I am not 100 % on how to test it as you would need to no some technical information on that particular make and model of valve, since there are so many on the market. If you have a Haynes or Chilton manual for your vehicle it may explain the correct procedure and how much resistence it should have.

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1 Answer

The brakes are really hard to push.they dont stop the truck like they should and the passenger side rear is trying to lock up.


Do you feel the brake pedal go down when you hold you foot on the pedal while starting the truck ? Maybe the power booster is bad. The power brake booster is vacuum controlled in most cases an if you hold your foot on the brake pedal when starting you should feel the pedal go down if working correctly .

Oct 10, 2015 | 2000 Dodge Ram 1500 Truck

2 Answers

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

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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

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1 Answer

When coming to a stop, the brakes work fine until I get almost stopped, then the pedal will push down further and brakes will come on hard, and stop vehicle hard, what could be the problem?


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I have a 1992 izuzu rodeo LS 4x4 v6 and my brakes are having a hard time stopping i have replased the master cylinder the brake pads the rotors iv bled them but it still has a hard time stopping and it...


Check the caliper sliders, they may be seized causing limited brake pad contact. Also check the calipers for siezed pistons.
After bleeding the system, sometimes the proportioning valve will have to be reset manually. You can do this by having an assistant press the brake pedal and open a bleeder screw slightly on one side [ front or rear ] of the system, it may reset. If not, try doing the other side of the system.
If the brake pedal seems to be pushing back against you then either the Brake Booster isn't getting proper vacumn, or is faulty.
If the vehicle has drum rear brakes, make sure they are adjusted properly. If they are set too loose the pedal will feel spongy and low.
Hope this helps.

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1 Answer

Spongy brakes


So long as the brake booster is working, test it by turning on the engine, press the brake pedal all the way down, then shut off engine keeping your foot on the brake pedal, if the pedal comes up slightly pushing against your foot then the booster IS working.

Did you BLEED the brakes??????

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1 Answer

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