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Old 01-04-2012, 01:00 PM   #1
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Brakes

When I apply the breaks there is a loud air noise, almost like air brakes. The pedal is extremly hard to press and every now and then it will just go soft and half way down. Do you think it is the brake booster or should I first try replacing the check valve?

Thanks

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Old 01-04-2012, 01:02 PM   #2
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Sounds a lot like a vacuum issue within the booster...have you checked the vacuum line to it?

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Old 01-04-2012, 02:50 PM   #3
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Try replacing the line first it might just be leaking
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Old 01-04-2012, 02:53 PM   #4
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Any particular type of line? I have never worked on full size cars. It has always been the little model type.

I am a quick lerner and dont mind getting my hands dirty though.
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Old 01-04-2012, 04:14 PM   #5
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I don't know what year you have, but check the vac. line(s) coming off of the brake booster. You should have at least one into the check valve. It's probably cracked. Trace it back and take any of the lines to a parts store and they'll match it up. Your check valve could be bad but chances are it's a vac. line leaking.
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Old 01-04-2012, 05:16 PM   #6
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Thanks, I was thinking the vacum line size would be generic and you just go by so many feet of it. I will check the line this weekend when I get the garage clean enough to actually make it to the jeep. I bought it and stuffed it in the back of the garage until I get all the christmas decoration boxes put back up.
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Old 01-04-2012, 06:23 PM   #7
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The check valve pretty much just make sure the breaks do not jam on if you had a backfire in the intake!
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Old 01-05-2012, 05:56 PM   #8
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When I got home today I made my way back to the jeep. could not really see much in the garage. When I first started it I did not hear the air leak. after about a minute it was back and I did notice that when I apply breaks the idle is not as smooth.
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Old 01-05-2012, 06:05 PM   #9
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I'm thinking brake booster.
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Old 01-05-2012, 06:08 PM   #10
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Is there a rebuild kit for the booster or do I have to buy the complete unit?
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Old 01-05-2012, 06:34 PM   #11
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I've always just replaced them as a unit. Most auto part stores will sell new or remanufactured ones fairly reasonable. You may be able to find a good used one cheap too if your on a budget.
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Old 01-05-2012, 07:37 PM   #12
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I thought we were all on budgets and that is why we drive yj's
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Old 01-05-2012, 07:47 PM   #13
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at this price I would just go with a new unit if this is in fact the correct part. Seems to be huge price differences from site to site

Buy Cardone Power Brake Booster 50-4004 at Advance Auto Parts
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Old 01-21-2012, 08:55 PM   #14
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Quote:
Originally Posted by flatline View Post
I'm thinking brake booster.
Just to follow up in case anybody else is having this issue.

Replaced the booster and master with one from Oreilys autoparts.

$89 dollars. Not real hard to do, you will need a helper at one point.

Fixed my issue.

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