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zaerod

zaerod 3/23/2010

1999 Jeep Cherokee SE 6 Cyl 4.0L

Brakes

Sounds like air is coming out where the brake and gas peddal is

when i start my jeep it sounds like air is coming out by the brakes area. Also when i press on the brakes the hissing/air sounds continue. please help

6 Answers


RC

RC 3/23/2010

Sounds like the power brake booster is leaking.

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zaerod

zaerod 3/25/2010

Now that i have changed my brake booster im not getting the brakes to work at all they feel spongy and its not stopping the car at all. what should i do now?

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HouseCallAuto

HouseCallAuto 3/25/2010

There is a check valve where the vacuum hose is attached to the booster, possible bad check valve. Secondly, when you replaced the booster you had to remove the master cylinder. Most vehicles have a round seal that goes in the front of the booster over where the pushrod is and that seal can fall out without you seeing. If you leave it out you will have little power brake function. Thirdly, did you have any reason to open any of the hydraulic brake lines where air would get in? Did you disconnect the line that go to the master cylinder or leave them connected while you replaced the booster?

Kevin

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zaerod

zaerod 3/26/2010

ok kev i got you. I do remember a round black plastic seal now only if i can find it. To answer your questions yes i had to disconnect the brake lines off the master cylinder because it was hard for me to get the brake booster out without doing so. Did i ruin the master cylinder?

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HouseCallAuto

HouseCallAuto 3/26/2010

No, the master is OK, it is just that you should bleed the air from the 4 wheels when you reinstall the master or you will likely have a pedal that was not as good as before you took it apart. I was just trying to isolate the cause of your brakes not working. You could have left out the seal and/or the brake pedal function would be affected by air in the system. So there are two reasons for your brakes to feel terrible.

Kevin

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jeepguyracing

jeepguyracing 4/4/2010

start bleeding them from the right rear then left rear then passenger front then drivers front.You can do it yourself with a one man bleeder.cost like $10.00 at pepboys.

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