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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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.

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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.

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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.
George.

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Brake air leak noise


check under dash for a leaky vaccum switch. if booster was faulty brake pedal would be very hard to depress.

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