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05-07-2003, 06:51 PM
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#1
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Registered User
Join Date: Dec 2001
Location: Rhode Island
Posts: 638
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Why do my brakes do this?
When I boot up the beast in the morn the brakes don't work so hot. They don't grab until the pedal is halfway down. After a minute or two they are fine. Ideas? Thoughts?
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2002 Sport: I6, 4.56 gears, SYE, RE 3.5", 305 BFF MTs.5-spd,d30/d44.
2004 Grand: I6, wife's
1998 XJ: My daily driver. I6
"The Second Amendment is not about duck hunting, and I know I'm not going to make very many friends saying this, but it's about our right, all of our right to be able to protect ourselves from all of you guys up there." - Dr. Suzanna Gratia Hupp, appearing before Representative Charles Schumer's committee hearings on the assault weapons ban
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05-07-2003, 07:09 PM
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#2
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Registered User
Join Date: Dec 2002
Posts: 309
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Sounds like something to do with the booster... check the vaccuum line to it, and the bushing that holds the vaccuum line to the booster. I'm not sure the procedure to check the booster itself.
HTH
Oldblue
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05-07-2003, 07:16 PM
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#3
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Senior Web Wheeler
Join Date: Jun 2002
Location: I miss Austin
Posts: 3,832
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Air in the lines can also cause some funny things to happen, but I think it would cause the pedal to grab then slip.
When was the last time you had the brakes done?
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... an no sidewindin' bushwackin', hornswagglin' cracker croaker is gonna rouin me bishen cutter.
00 TJ
98 XJ
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05-07-2003, 07:20 PM
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#4
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Registered User
Join Date: Dec 2001
Location: Rhode Island
Posts: 638
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New brakes in the rear last year. Never had this problem before the lift. Blame it on the lift right? I think I'll try bleeding them.
__________________
2002 Sport: I6, 4.56 gears, SYE, RE 3.5", 305 BFF MTs.5-spd,d30/d44.
2004 Grand: I6, wife's
1998 XJ: My daily driver. I6
"The Second Amendment is not about duck hunting, and I know I'm not going to make very many friends saying this, but it's about our right, all of our right to be able to protect ourselves from all of you guys up there." - Dr. Suzanna Gratia Hupp, appearing before Representative Charles Schumer's committee hearings on the assault weapons ban
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05-07-2003, 07:27 PM
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#5
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Senior Web Wheeler
Join Date: Jun 2002
Location: I miss Austin
Posts: 3,832
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Well everything is always the lifts fault 
Did you have to extend the brake lines?
__________________
... an no sidewindin' bushwackin', hornswagglin' cracker croaker is gonna rouin me bishen cutter.
00 TJ
98 XJ
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05-07-2003, 07:37 PM
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#6
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Registered User
Join Date: Dec 2002
Posts: 309
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I've never heard of air in the system going away after a few minutes of operation. If there's air in there it'll stay in there until the system is blead. You can tell if there's air in the lines by pumping up the pedal while the jeep is running - if it gets stiffer, there's air in there and you're compressing it. But I have a feeling there's no air in there otherwise the problem wouldn't remedy itself after a few minutes.
HTH
Oldblue
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05-07-2003, 07:52 PM
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#7
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Senior Web Wheeler
Join Date: Jun 2002
Location: I miss Austin
Posts: 3,832
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Quote:
Originally posted by oldblue
I've never heard of air in the system going away after a few minutes of operation. If there's air in there it'll stay in there until the system is blead. You can tell if there's air in the lines by pumping up the pedal while the jeep is running - if it gets stiffer, there's air in there and you're compressing it. But I have a feeling there's no air in there otherwise the problem wouldn't remedy itself after a few minutes.
HTH
Oldblue
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My bad, that's what I thought he meant by grabbing halfway down then being "ok" (I read it as stiffening up) after a minute or two ..... guess my brain is deep fried today
__________________
... an no sidewindin' bushwackin', hornswagglin' cracker croaker is gonna rouin me bishen cutter.
00 TJ
98 XJ
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05-07-2003, 09:54 PM
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#8
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Registered User
Join Date: Dec 2002
Posts: 309
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no problem 
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05-08-2003, 06:56 AM
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#9
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Registered User
Join Date: Apr 2003
Posts: 38
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Hanes or Chilton detail a Booster test sequence that you do with the engine on and then off to see if it is working properly.
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05-08-2003, 07:51 AM
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#10
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Registered User
Join Date: Aug 2002
Posts: 157
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Just for giggles, pull your rear brake drums and see if your axle seals are leaking oil onto the shoes and drum. After using them a bit, they dry off and work better. Your applying more pedel at first to overcome the "well lubed" shoes.
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88 XJ 4.0 4X4 AT 4Dr. 9"K&N, modified Rusty's air tube, Flowmaster cat and muffler, 2.5" pipe manifold back, LT235/75-15, not lifted, Pioneer CD and speakers, come-a-long and strap, 72hr kit for 2, also I have the factory service manuals.
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Why do my brakes do this?
