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Old 11-06-2009, 07:18 AM   #1
that's what she said

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Brake Help

the front brakes on my cj7 are not working at all after a manual to power brake conversion. my hubby put a used master cylinder and brake booster out of a yj in the cj and bled them several times and could not get the fronts to work. the rear brakes work fine. after bleeding them "to death" , and then decided that the problem was with the used master cylinder and brake booster. he got a re-man master cylinder and booster from advanced auto and we are still having the same problem. he has bled several quarts through the front lines and there is no air in the lines, but they still won't work. what else could it be? could the proportioning valve be bad? any help or input is appreciated.

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Old 11-06-2009, 04:38 PM   #2
that's what she said

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bump

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Old 11-06-2009, 04:42 PM   #3
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A buddy told me not to empty the master cylinder because its very hard to bleed it.
Ill send you a PM.
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Old 11-07-2009, 02:41 PM   #4
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when we got the new (re-man) master and brake booster it was empty and needed to be filled and bled.
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Old 11-07-2009, 02:48 PM   #5
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Did you used the proportioning valve off the YJ?
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Old 11-07-2009, 02:50 PM   #6
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Quote:
Originally Posted by coyote_94yj View Post
Did you used the proportioning valve off the YJ?
it is the original valve from the cj7. from what he can tell the valve is the same the only difference is the location.
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Old 11-07-2009, 02:54 PM   #7
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I would use the YJ valve. It is designed for the extra pressure from the booster.
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Old 11-08-2009, 01:54 PM   #8
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Old 11-08-2009, 06:59 PM   #9
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are you bench bleeding the master before install?
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Old 11-09-2009, 07:53 AM   #10
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Quote:
Originally Posted by jpdocdave View Post
are you bench bleeding the master before install?
yes
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Old 11-09-2009, 09:54 AM   #11
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Just leave it in that Teralow range and you won't need the brakes.

(upon further reflection, this may not be the best advice)
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Old 11-10-2009, 07:58 AM   #12
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Quote:
Originally Posted by Geoff@Bestop View Post
Just leave it in that Teralow range and you won't need the brakes.

(upon further reflection, this may not be the best advice)
the teralow is very low, but working brakes are definitely a requirement. i'm sure whomever i would be following would appreciate that too.
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Old 11-10-2009, 08:58 AM   #13
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try new proportioning valve as stated above. If this doesn't work Either you are bench bleeding the MC improperly, or there is a blockage somewhere preventing pressure from making it to the fronts (if fluid is getting there this isn't it) , or the fronts are seized(another doubtful cause).
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Old 11-10-2009, 09:06 AM   #14
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Quote:
Originally Posted by mrcarcrazy View Post
try new proportioning valve as stated above. If this doesn't work Either you are bench bleeding the MC improperly, or there is a blockage somewhere preventing pressure from making it to the fronts (if fluid is getting there this isn't it) , or the fronts are seized(another doubtful cause).
it can't be a blockage b/c he was able to bleed the fronts, and i don't think the calipers are seized b/c they worked fine before the MC install. i think he is heavily leaning towards the proportioning valve.
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Old 11-10-2009, 09:48 AM   #15
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Quote:
Originally Posted by jgano23 View Post
it can't be a blockage b/c he was able to bleed the fronts, and i don't think the calipers are seized b/c they worked fine before the MC install. i think he is heavily leaning towards the proportioning valve.
Yeah that's the safest bet.
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Old 11-10-2009, 07:55 PM   #16
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just use the e-brake MAN UP lol.
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Old 11-11-2009, 08:34 AM   #17
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just use the e-brake MAN UP lol.
it is a cj, it doesn't work. i have to chock the wheels or park it in gear. once the brakes are working properly he is going to fix that too.
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Old 11-11-2009, 02:43 PM   #18
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it is a cj, it doesn't work. i have to chock the wheels or park it in gear. once the brakes are working properly he is going to fix that too.


Glad I haz TJ. all that nonsense works.
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Old 11-11-2009, 03:06 PM   #19
that's what she said

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Quote:
Originally Posted by mrcarcrazy View Post


Glad I haz TJ. all that nonsense works.
i'm sure it used to work, just not since i've had it

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