Load Sensing Valve

[95wrangler]

New guy needs help.

90 comanche 4.0 4x4.Long bed,all original/stock equipment.I have/had most problems inherent with a 23 year old comanche.Last week I had the brakes re-done everything new ; roters drums pads shoes calapers rear cylinders and front hoses.Along with a 3.5in lift. All on the same day.The brakes felt mushy right out of the gate. I feel like the brakes should lockup when I stomp.on them,They don't.I read the post from Hornbrod on aug 09,most informative,My question is; Do I have a load sensing issue?I do know the LSV linkage is active.

Thank for the input

[onlyinajeep726]

Upgrade to a dual diaphragm brake booster and master cylinder from a '95-'96 XJ. Bypass that load sensing proportion valve and run the XJ prop. valve that's mounted to the booster. Also, make sure you've bleed the brakes really well.

 

http://www.cardomain.com/ride/325707/1993-jeep-cherokee/page-15/

 

http://www.jpmagazine.com/techarticles/drivetrain/154_0810_cheap_jeep_brake_system_upgrades/

[HOrnbrod]

Did you extend the load sensing valve rod the same amount as the lift? If not, the valve will will not bias the rear brakes correctly.

 

Also, the load sensing valve requires an additional bleed procedure as follows (From the FSM, originally posted by Eagle):

 

Here's the official FSM procedure to follow when bleeding the brakes on an MJ that still has the two lines to the rear:

 

After bleeding the brake calipers and cylinders the rear brake by-pass line must also be bled.

 

Open a front caliper bleed fitting and depress the brake pedal to the floor. This will shuttle the by-pass differential valve and allow fluid to flow through the by-pass line. The brake warning light on the instrument panel will illuminate when the ignition key is in the ON position. This signals the shuttling of the valve.

 

Re-Bleed the rear brake cylinders with the front caliper bleed fitting open.

 

After re-bleeding the rear brake cylinders the entire system must be bled again.

 

Bleed the brake calipers and cylinders in the following sequence:

 

1st -- Right rear

 

2nd -- Left rear

 

3rd -- Right front

 

4th -- Left front

 

As far as this post:

Upgrade to a dual diaphragm brake booster and master cylinder from a '95-'96 XJ. Bypass that load sensing proportion valve and run the XJ prop. valve that's mounted to the booster. Also, make sure you've bleed the brakes really well.

 

Agree with the booster/master upgrade. If your load sensing valve is in good shape and want to retain it's functionality because you haul occasional loads in your MJ, ignore the rest of it.

[95wrangler]

Thanks agin for your information.No we did not do any of the above,When I get back in town we will go over the system with detail.

The first option would be my last resort,I want to keep it as it is for as long as possible.