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post #1 of 5 Old 07-15-2019, 11:37 AM Thread Starter
bigjon99
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Brake issue!

I have a 1988 MJ. I have an issue that I have been working on for about a month with no positive result. My brake pedal is stiff when I have the car off, but when I turn it on the pedal goes right to the floor and I get no pressure. I have replaced- Brake booster Master cylinder Both front calipers and pads Brake lines connecting cylinder to proportioning valve.
PLEASE HELP I want to be able to drive this.

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post #2 of 5 Old 07-15-2019, 02:29 PM
87MJTim
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The MJs came with “distribution valves “ that have a bypass line when there is a brake failure. The bleeding steps are different than a proportioning valve. Have you followed the factory steps to bleed the brakes?

Tim

87 Comanche, 4.0, AX15 (formerly BA10/5), D44
84 CJ7, 4.0 (93 XJ) AX15 (Formerly T5)
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post #3 of 5 Old 07-15-2019, 03:00 PM Thread Starter
bigjon99
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Quote:
Originally Posted by 87MJTim View Post
The MJs came with “distribution valves “ that have a bypass line when there is a brake failure. The bleeding steps are different than a proportioning valve. Have you followed the factory steps to bleed the brakes?
Yes I followed the factory steps to bleed the brakes. Is the distribution valve something I can check or replace?
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post #4 of 5 Old 07-15-2019, 03:06 PM
87MJTim
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You could swap out to a proportioning valve.

Here are some links to the MJ brake and fixes and work arounds:

https://comancheclub.com/topic/53274...ete-procedure/

https://comancheclub.com/topic/47993...ioning-valves/

https://comancheclub.com/topic/51268...delete-bypass/

Tim

87 Comanche, 4.0, AX15 (formerly BA10/5), D44
84 CJ7, 4.0 (93 XJ) AX15 (Formerly T5)
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post #5 of 5 Old 07-15-2019, 03:32 PM Thread Starter
bigjon99
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Quote:
Originally Posted by 87mjtim View Post
you could swap out to a proportioning valve.

Here are some links to the mj brake and fixes and work arounds:

http://comancheclub.com/topic/53274-...ete-procedure/

http://comancheclub.com/topic/47993-...ioning-valves/

http://comancheclub.com/topic/51268-...delete-bypass/
thank you!
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