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Old 04-14-2009, 04:40 PM   #1
that's what she said

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Brake Pressure Issue

my hubby replaced the rear brake drum assembly and now the cj has almost no brake pressure. we have tried bleeding the brakes several times, but to no avail. what else could it be? btw, they are manual brakes (not power brakes).

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Old 04-14-2009, 04:44 PM   #2
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did you get new drums to? sometimes there's such a big ridge that the drum slides on, but then its too far out of adjustment. or they just need adjustment. replacing shoes has nothing to do with the hydralic system, did he open the system for some reason while doing them?

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Old 04-14-2009, 04:47 PM   #3
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oh, my bad. i'm retarded. i just remembered that he had to replace the brake line b/c i broke it the last trip to RC. the brakes and drums, needed to be replaced, but that has nothing to do with the brake issue. anyway, he replaced the rear brake lines and now there is barely any pressure
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Old 04-14-2009, 04:52 PM   #4
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ok, then its air in the system. bleed it from the right rear, the left rear, then right front, then left front. (farthest from the master to the closest.) bleed the fronts to just in case. make sure there's no leaks. i've also seen quite a few old master cylinders go bad after lines break. not really sure why, something with moisture and or air entering the system.
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Old 04-14-2009, 04:55 PM   #5
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it does have some brake pressure, it doesn't drop entirely to the floor when the pedal is pressed. could it still be air in the line? the pedal is very loose for the first 6" of travel, then there is pressure from there.
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Old 04-14-2009, 04:57 PM   #6
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could be, if i could feel it i'd know right away if the master was bad. bleed the crap out of it some more. obviously don't let the fluid get low while you're doing it or you have to start all over.

then if you put steady pressure on the pedal, and there's some pressure, but it slowly sinks, its bypassing pressure at the master cylinder. best way i can describe it.
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Old 04-14-2009, 05:01 PM   #7
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he's run a whole 8 oz of fluid through the system thus far though. i don't think it is the master cylinder b/c it isn't doing what you described. he thinks it is still air in the system, but he's run so much fluid through it he doesn't see how it could be.
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Old 04-14-2009, 05:02 PM   #8
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thats not all that much, to bleed all 4 wheels you'd use more than that. bleed the crap out of them in the order i gave ya, like 10 times per wheel, (keep topping off)after that see if it feels like i described the master cylinder. but make sure there's no leaks at the fittings, that will do the same thing.
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Old 04-15-2009, 06:51 PM   #9
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got it fixed. they just needed to be bled more. thanks again dave.
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Old 04-15-2009, 07:40 PM   #10
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you got it, maybe i had the chuck norris effect on your brakes. they knew i talked about it, so they figured they better listen.

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