Question about 1988 Jeep Comanche

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Proportioning valve. Rear brakes get lock when ptess brake pedal

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  • Jeep Master
  • 20,706 Answers

Get it serviced now, its dangerous to drive
old post

Posted on May 08, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 41 Answers

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

davespcr
  • 115 Answers

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

  • 18 Answers

SOURCE: brakes lock up slow speeds

it has to be the brake booster there is a valve in it that mut be sticking

Posted on Jan 26, 2009

Mikey108
  • 475 Answers

SOURCE: 99 Jeep GC brake lock.

You say they replaced basicly everything that involes the rear brakes.
Every step they took to find the problem could lead to the solution,BUT did they check the inboard brakes. The brake system on a jeep that has rear rotors have inboard shoes for the parking brake.
You could have a parking brake cable that is frozen (this will cause a drag on the inboard brakes. Do you use the parking brake? Maybe the parking brake shoes are adjusted too tight?

Posted on Feb 10, 2009

  • 1796 Answers

SOURCE: rear brake light are not working

Hi!!

The CLK HAZ STOP 20 Amp Fuse protects the Stop and Hazard Flasher circuits and is located in the fuse panel under the left side of the instrument panel.

Even if you can't find it, try your Hazard lights to check it. If fuse is OK, check Brake Switch on top of the brake pedal. It is a Normally Open switch, check for power coming in, if OK, disconnect electric terminal and check it for continuity, if none, replace.

Good Luck!!!

Posted on Mar 12, 2010

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1 Answer

What does the proportioning valve do?


Assuming you're talking about the brake system...
The proportioning valve is on the rear brakes only when the vehicle has rear Drum Brakes.
What it does is limits the brake line pressure to the rear brakes during normal stopping. This way the rear brakes don't lock up and cause the vehicle to fish tail or spin.
When you press the brakes harder than normal, the proportioning valve opens more to allow more line pressure so you're able to stop faster.

Jul 10, 2014 | 1983 Jeep CJ7

1 Answer

Fleetwood problem


Pretty normal to not be able to lock the brakes without the assistance of the booster, it'll take a lot of pedal pressure without it. It's also normal for the pedal to feel harder without the booster, this goes for any car/truck with power brakes. Try it with any other car you have and you'll see.

I've worked on several old Cadis but don't recall what year they started using front disc. If it's been changed from drum to disc you'll likely need a different proportioning valve and possibly a different master to get them to work right. Talk to the seller and ask if the brake feel changed when they replaced the master and if they changed any other parts.

Mar 31, 2017 | 1968 Cadillac Brougham

1 Answer

Rear brakes lock when press brake pedal.


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?



http://www.jeepforum.com/forum/f53/bad-proportioning-valve-any-ideas-1127468/#post10505224







here is the valve.

sold at , JEEP.



http://www.factorychryslerparts.com/products/JEEP/1988/COMANCHE/VALVE--Proportioning--VALVE--Proportioning--ECE-198789--1989--Except-France--Italy--1990--KDX--KDX-After-3-1-93--KDX-Up-to-3-1-93/4520728/52009114.html



Chysler p/n

52009114 ; 52003118



google that and find them for $75

Feb 16, 2014 | 1988 Jeep Comanche

1 Answer

1988 jeep comanche brake proportioning valve


there only 2 ways (USA answers)
they have a guage test (expensive gauge)
or replace it ,if in fact you know for sure the rear brakes are good.

i think raybestos sells this.valve rebuilt.

the valve is height measuring disconnect the link and see if its
free? is it jammed? i had a 88 from new.
i purged brake fluid every year and it lasted for 250k miles. and sold it.
so there is a bench mark on life.(best case)
did you read the fsm? yet
id does cover these tests.

try alldata.com (usa ) it may cover Commanche.

Feb 16, 2014 | 1988 Jeep Comanche

1 Answer

Hi I am from Norway and have replaced my proportion valve for rear brakes on my Corolla 1996 1,3 xli wagon.I am wondering how I can bleed off air and flush back to new brake fluid.Do I need to connect a...


None of those things . Just bleed the brakes normally starting from the longest line and ending with the shortest. The proportioning valve will always let brake fluid through, just not enough to lock up the rear brakes until you press heavy on the pedal . It is there so that full pressure to the large front brakes is reduce in proportion to the smaller rear brakes.

Jan 23, 2014 | 1996 Toyota Corolla

1 Answer

What is a brake proportion valve function


Front brakes require different fluid pressure than the rear, as more of the braking is done by the front brakes, because of vehicle weight shifting forward during braking, etc.

Proportioning valves are used in cars to reduce the fluid pressure to the rear brakes, to reduce rear wheel lock-up.

Oct 02, 2013 | Cadillac DeVille Cars & Trucks

3 Answers

Have a 1993 dodge Caravan SE. Purchased it from a man which converted it from ABS to hydraulics. I didn't know it had brake problems till i got it running. He put on a 3 outlet 2 inlet proportional...


if something goes wrong with abs the brake system it reverts back to standard system!! If you can pump brake pedal up and hold it and start engine and it drops thats normal.You say low pedal if you go 15mph on road and check where pedal is when brakes apply.Power brakes will push aLMost to floor while stopped but while moveing you`ll almost go to slide or will go into slide if pedal is pushed to floor.Get on some gravel at 10 mph and hit brakes to a complete stop get out and check to see if all 4 tires slid or 2 front or only 2 rear. this will get you closer to problem good luck.

Jul 12, 2011 | 1993 Dodge Caravan

2 Answers

IM WORKING ON A 88 OLDS 98 I REPLACED THE MASTER CYL. TWICE BOTH HOSES PADS ADJUSTED THE REAR BRAKES AND BLED 2 QTS. OF FLUID THROUGH IT AND STILL I HAVE A CRAPPY PEDAL IT FEELS LIKE THERE IS NO PRESSURE...


Have you changed the brake hoses on the front going to the brake caliper?If not,this could be the problem,also,when bleeding,only pump the pedal one time upon releasing the bleeder screw,do not pump the pedal,start at the master cylinder,then the right rear,and the left rear,and the right front and left front in that order,adjust the rear brakes to where the brakes are dragging pretty good,but are not locking up,

Aug 17, 2010 | 1988 Oldsmobile Delta 88

2 Answers

A master cylinder has a restricted compensator valve what problem will i most likely find with the pedal?


If your valve becomes defective then the brake pressure ratio to the front and the rear brakes will change. You will see or feel a difference. the front-end may nose dive or lock-up. The rear brakes may react the same way.

May 12, 2009 | 1998 Ford Explorer

1 Answer

I need a diagram of the entire breaking system on a 1993 ford taurus i just replaced a rear line and i think i stripped the extention piece i had to add to the end of the break line. the one that goes into...


here is a 96 taurus

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Item Part Number Description 1 2C296 Anti-Lock Brake Tube 2 2C219 Anti-Lock Brake Module 3 2005 Power Brake Booster 4 2263 Front Brake Tube 5 2B091 Brake Pressure Control Valve 6 2140 Brake Master Cylinder 7 2B547 Brake Load Sensor Proportioning Valve 8 N802191-S60 Bolt 9 2L568 RH Rear Brake Tube 10 2L569 LH Rear Brake Tube 11 2C287 Brake Fluid Distributor Tube 12 N808531-S301 Bolt 13 — Front Side Member 14 N802324-S56 Bolt 15 18124 Front Shock Absorber 16 2B121 Front Disc Brake Caliper 17 2078 Front Brake Hose 18 2264 Front Brake Tube 19 2553 Rear Disc Brake Caliper 20 2A442 Rear Wheel Brake Hose 21 N808728-S60 Bolt 22 — Side Rail 23 N802324-S60 Bolt
Brake Load Sensor Proportioning Valve

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Item Part Number Description 1 2B547 Brake Load Sensor Proportioning Valve 2 — Body 3 N802191-S56 Bolt (2 Req'd) 4 2L568 Brake Tube Assy 5 2L569 Brake Tube Assy 6 2265 Brake Tube Assy 7 2B255 Brake Tube Assy 8 5500 Rear Suspension Arm and Bushing 9 W611634-S301 Bolt A — Tighten to 11.4-15.6 Nm
(8-12 Lb-Ft) B — Tighten to 10-14 Nm (7-10 Lb-Ft)

Brake Hose, Rear —Drum

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Item Part Number Description 1 — Rear Side Rail 2 2L569 Rear Brake Tube 3 N602324-S60 Screw 4 N611193-S60 Screw 5 2C023 Left Hand Rear Hose and Connector 6 2210 Rear Drum Brake Backing Plate 7 18125 Rear Shock Absorber 8 2267 Rear Brake Tube A — Tighten to 16-20 Nm (12-15 Lb-Ft)

May 10, 2009 | 1993 Ford Taurus

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