Question about 1991 Jeep Comanche

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1991 jeep comanche brakes

My 2 WD comanche has a brake noise when you depress the pedal. It sounds like air leaking until the pedal is fully depressed. I thought it was the brake booster, but when I use my repair book diagnostics, it doesn't seem so. We have replaced pads and the master cylinder in the last year and bled the brakes but the vacuum noise persists. Any help would be appreciated

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Check under dash for leaking vaccum switch. usually manufacturers use vac switches to release the e-brake automatically when applying the brake.

Posted on Dec 27, 2008


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1 Answer

My brake pedal will not budge, and a hissing noise present when running

The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:


Jan 27, 2016 | 1989 GMC Sierra

1 Answer

Brakes apply themselves

by the sound of this the brake booster is leaking fix the vacuum leak or replace the brake booster and all will be ok

Feb 16, 2012 | 1987 Ford Ranger

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I have a 2004 Land cruiser and changed the right rear brake cyl and brake shoes . What is the proper procedure to bleed the rear brake system. Thank you for your help.

  1. Check the fluid level in the reservoir after bleeding each wheel. Add DOT3 fluid, if necessary.
  2. If the master cylinder was disassembled or if the reservoir becomes empty, bleed the air from the master cylinder as follows:
    1. Disconnect the brake lines from the master cylinder.
    2. Slowly depress the brake pedal and hold it.
    3. Block off the outlet plug with your finger, and release the brake pedal.
    4. Repeat 3 or 4 times.

  3. Bleed the brake starting with the one furthest from the reservoir and then the next furthest, etc.
  4. Depress the brake pedal several times, then loosen the bleeder plug with the pedal held down.
  5. At the point when fluid stops coming out, tighten the bleeder plug to 11 Nm (8 ft. lbs.), then release the brake pedal.
  6. Repeat until all the air in the fluid has been bled out.
  7. Repeat the procedure to bleed the air out of brake line for each wheel.
  8. Check the fluid level and add DOT3 fluid if necessary.

Aug 07, 2011 | 2004 Toyota Land Cruiser

2 Answers

I have a 2001 ford taurus and every time i push the brake pedal my brakes dont brake right and sounds like air is leaking

Is the brake pedal getting harder to depress? Also have you had any work done on the vehicle immediately prior to this problem? If the pedal is getting harder to depress it could be a failing power brake booster if your car has one. Some ABS systems are different than others

Feb 17, 2011 | 2001 Ford Taurus

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Every time i turn off my 98 Jeep Cherokee, the brake lights stay on until i step on the brake. Then they turn off. Is this normal or is something not right?

It is not normal. I would say your break switch is sticking. There is a button on the end that sometimes gets stuck. It turns your brake lights on and off.

Feb 06, 2011 | 1998 Jeep Cherokee

3 Answers

You have to pump the brakes to build pressure everytime you stop. I replaced the master and the problem still occures. There are no visable leaks and the resivor stays full aswell.

You may have air in your braking system. You will need to bleed your brakes.

Some people say it is ok to just bleed the front brake that is on the same side as the master cylinder. I personally feel that all 4 brakes should be bled.

On each caliper/drum there should be a small nipple type fitting with a (usually) 8mm nut at its base. Loosening this nut will allow brake fluid to seep from the nipple opening.

Work with a partner. Remove your first wheel of the brake to be worked on. Loosen the 8mm nut. Have your assistant depress the brake pedal steadily to the floor and hold. If a steady stream of fluid comes out tighten the nut and move on to the next brake. If the brake fluid comes out sputtering with air, tighten the nut after your assistant depressed the brake (but ensure they kept the pedal to the floor). Have them take their foot off the brake. Loosen the nut again and have them depress the brake fully again. Repeat until steady stream of fluid comes out with no air.

Do this for all 4 brakes.

Once complete refill the reservoir to the recommended fill line.

Jan 10, 2011 | 1988 Mazda B2200

2 Answers

The sound of the air is like aire is been released

Especially with noises, it's nearly impossible to diagnose without being there. The noise you are hearing may be the first indication of your catalytic converter beginning to fail. As the exhaust gets squeezed through a smaller and smaller opening it can make that kind of noise. If the engine is running rough at idle, I'd also check for vacuum leaks.

Oct 27, 2009 | 1991 Jeep Comanche

1 Answer

Brake light on 1989 jeep comanche. Sometimes when i apply the brakes the light comes on sometimes it dose not. I need to know what I might need to do to fix the problem.

Hello, this sounds like a brake lamp switch it is located around the brake pedal area, renew this and your problem should go.
Hope this has helped you out.

Jul 16, 2009 | 1989 Jeep Comanche

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