Question about 1991 Jeep Comanche

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Brake air leak noise

1991 comanche- when depress brake pedal you hear a air noise that stops when brake is fully depressed. Could this be the brake booster?

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

Posted on Dec 27, 2008

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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:



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Jan 27, 2016 | 1989 GMC Sierra

1 Answer

I hear a cclicking noise when I step on break when key is on. I don't hear the click while car is running. Its a 97 infinity q45


Most automatics have a lock on the transmission selector.
When the vehicle is in P (Park) you are not able to select drive or a gear unless you depress the brake pedal.
My Audi Q7 ha a solenoid and you hear it click when I put my foot on the brake.
This solenoid stops you from accidentally selecting a gear without the brake depressed.

Is it a single click when you depress the pedal.
Or is it a constant click click click ?

Apr 28, 2015 | Infiniti Q45 Cars & Trucks

2 Answers

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

3 Answers

Abs brakes chirping noise, when pedal depressed,


worn out brake pads and slightly warped rotors. Most brake pads have small steel tabs that touch the rotor at a 90 degree angle when it is time for replacement. if you keep driving on the worn pads, it will stop chirping but that just means the tabs (also called wear indicators) have broken off and repair is about to get very pricey.

Feb 28, 2010 | 2001 Mitsubishi Montero

2 Answers

My '98 Escort ZX2 has 175,000 miles. I recently noticed a grinding or chattering with the clutch pedal depressed with the transmission in first gear. While stopped at a light the car suddenly began jumping...


Hi:
You need to check your clutch master cylinder reservour, not your brake cylinder. It is located approx in front of the clutch pedal, outboard of the brake cylinder. If it is low, you need to inspect for leaks around it, the lines connecting it to the clutch slave cylinder that is mounted on the transmission.

Dec 05, 2009 | Ford Escort Cars & Trucks

2 Answers

1998 caviler when brakes are applied engine revs up


Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

Jun 04, 2009 | 2005 Hyundai Tucson

2 Answers

Air/Hissing Noise from Brake Pedal


this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

May 06, 2009 | 1995 GMC Suburban

1 Answer

Brake sound when I depress the pedal


sounds like your brake booster could be leaking

Mar 10, 2009 | 1995 Nissan Maxima

1 Answer

1991 jeep comanche brakes


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

Jul 17, 2008 | 1991 Jeep Comanche

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