Question about 1988 Jeep Comanche
Does there is a way to by pass the proportioning valve and discard it?
Get is serviced.
its stuck in , low bed (loaded) mode. the lever is or parts in side
stuck in full load mode.
and guess what, if you bypass the valve, what will happen
the rear brake will lock, going fast and if on wet or worse roads. 10x worse. its there for a reason. to lower the brake pressure with no pickup bed load. or not heavy trailer tongue weight.
ever consider the rear brakes are bad. first. and not the valve.
service the rear shoes and slaves.
then check the bypass.
Does the truck still have the height sensing brake line bracket and line connected into the prop valve?
here is the valve.
sold at , JEEP.
52009114 ; 52003118
google that and find them for $75
Posted on May 08, 2014
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Posted on Jan 02, 2017
SOURCE: Brake line hose has hole in it
The only real solution to your problem is to replace the damaged line, bleed the brakes, and check for leaks after you are done. The line should go up to the frame, and go into a small metal bracket that is welded to the frame. The hose is usually held in place by a small metal clip, and a steel brake line will thread into the end of the hose assy. where it terminates in the frame mounted brakcet.
Posted on Nov 10, 2008
SOURCE: I have a Jeep Wrangler
The proportioning valve most definately can be the problem. Did you change it or is it the original? (A disc/drum system uses a 70%front/30%rear braking ratio, whereas an all-disc system is alot more even). I would first bleed the master cylinder. Then I would 'gravity bleed' the rest of the system by opening the bleeders on all 4 wheels. Do not at any point let the m/cylinder go dry. Also, do not touch the brake pedal.
Continuously check all 4 bleeders, when clean brake fluid with no bubbles at all is running from a bleeder, close it. When all 4 wheels are done, recheck the fluid level and you should be OK.
Pump the pedal to 'self-adjust' the rear calipers, then re-check the fluid level.
Any problem after that means you either have a loose connection (it's possible for a tiny leak to let air in, but not let fluid leak), a leak, or you need a new (disc/disc type) proportioning valve. I would try Summit Racing myself. Good Luck!
Posted on Dec 26, 2008
fairly normal...some are louder than others
but if the brakes work you will be OK
the air escaping is what allows the booster to function because it needs atmospheric pressure to boost the pedal application
I've replaced many of these for a customer only to find the replacement makes a worse noise!
Posted on Apr 06, 2010
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