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Old 07-20-2009, 08:45 AM   #1
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Exclamation Serious Brake Problem

Hi All,

Im new to this forum and in need of some dire help!! I have a 91 Wrangler and I've got nothing but problems. My jeep is my secondary vehicle and while I was in school it sat for quite some time due to a lack of money and time. Now that Im finished I've got more of both to be able to tinker around with my Jeep so I put it back on the road and with a little battery charge I thought I was good to go...I was wrong.

The front brakes kept locking up specifically the drivers side. So I replaced the front calipers and thought my problems would be solved...now the pedal goes right down to the floor so I got a refurbished master installed it bleed the brakes and still right to the floor thought maybe it was a faulty rebuilt master well after another refurbished, brand new and a junk yard find still right to the floor (thats 4 different masters) I think its safe to say its not the master. Replaced the power booster with fingers crossed praying something would work and still no good. I've talked to a bunch of people and no one's got any ideas, holds fluid so I dont think there's a leak anywhere and I havent seen anything on the driveway. I was advised to change the cables to the calipers maybe they were damaged, did that and still to no avail right to the floor. After that first initial push to the floor a few pumps will get me very minimal pressure wait a minute and again right to the floor definately not safe to drive by any stretch. I dont know what Im missing besides the entire summer season

Any ideas would be greatly appreciated!!

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Old 07-20-2009, 09:11 AM   #2
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how is the proportioning (spelling?) valve? Any leaks at the rears? Cylinders etc. Have you checked the metal lines for leaks?

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Old 07-20-2009, 10:21 AM   #3
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All the metal lines look good, and the rear wheel cylinders aren't leaking. The proportioning valve is the only component that I haven't changed out people in the know tell me that a bad valve would give you uneven brake pressure between the front and rear brakes but then I should still have a pedal. At this point I've replaced everything else so I might as well give it a shot. I'll let you know if it works, thanks.
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Old 07-21-2009, 01:47 AM   #4
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it all started with the new calipers?
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Old 07-21-2009, 08:33 AM   #5
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Yea, originally they were locking up and I wrote it off to build up from the truck having sat for so long so before I replaced them I gave them a good cleaning and after that the brakes were still locking up but I had pressure (before they locked that is)....so after the cleaning didnt work thats when I replaced the calipers and now no pressure. I'm picking up a valve this Thursday hopefully I'll get some time this weekend to change it out and see what happens.
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Old 07-21-2009, 11:33 AM   #6
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i would say you have air in the system.
how did you bleed it? the farest wheel 1st ?.
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Old 07-26-2009, 06:17 AM   #7
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when you installed calipers you made sure bleeders are pointing up? or atleast when on carrier they are on top? there is a left and right. you didnt drop a pad while installing.
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Old 07-26-2009, 06:23 AM   #8
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ooops

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