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Discussion Starter · #1 ·
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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Sounds a lot like a vacuum issue within the booster...have you checked the vacuum line to it?
 

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Discussion Starter · #4 ·
Any particular type of line? I have never worked on full size cars:eek:. It has always been the little model type. :nonono:

I am a quick lerner and dont mind getting my hands dirty though.
 

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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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Discussion Starter · #6 ·
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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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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Discussion Starter · #8 ·
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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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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