Brake System Problem -
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post #1 of 4 Old 04-23-2012, 06:02 AM Thread Starter
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1992 YJ Wrangler 
Join Date: Apr 2012
Location: Pittsgrove
Posts: 18
Brake System Problem

So I the brake line to the rear drums from the proportioning valve on my '92 blew last week. Installed all new SS lines and bled the system starting with rear passenger, driver passenger, front passenger, ...and here is where I ran in to problems. I got nothing coming out out of the bleed valve. I narrowed my problem down to the shuttle in the proportioning valve. It seems that as long as I press slow and steady on the break pedal, the front passenger caliper gets pressure. Soon as I press non the brake with normal foot pressure it is like the shuttle jams against the valve body and prevents any pressure getting to the FP caliper. Did I forget something when bleeding the lines or is it time for a new proportioning valve?

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post #2 of 4 Old 04-29-2012, 06:09 PM Thread Starter
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1992 YJ Wrangler 
Join Date: Apr 2012
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Nevermind, for anyone else having this problem i pulled apart the shuttle valve section of the proportioning valve after removing the switch sensor and reset the shuttle valve in its proper position. Problem seems solved.
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post #3 of 4 Old 04-29-2012, 06:51 PM
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1990 YJ Wrangler 
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Location: San Diego
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exactly the correct fix and thanks for posting back. One function of the proportioning valve is to direct the braking to the remaining circuit if one side fails. It's pretty simple to fix, but a big mess and a lot of bleed after.

You should probably replace teh rest of the hard lines before it happens again; they are all the same age.

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post #4 of 4 Old 04-29-2012, 07:17 PM Thread Starter
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Replaced all the hard lines with ss after the rear line blew.
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brake bleeding , brake proportioning valve

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