Question about 1998 Ford Explorer

2 Answers

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

Posted by on

  • 1 more comment 
  • boniface_dal May 15, 2009

    pointed me in yhe right direction

  • Ned C Cook
    Ned C Cook May 11, 2010

    compensator or proportioning valve? to make sure we speak of the same part and why do yo feel there is a restriction?

  • blueextc3221
    blueextc3221 May 11, 2010

    hard to press down


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 957 Answers

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.

Posted on May 12, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Ford Master
  • 3,433 Answers

It sounds like we are discussing a proportioning valve.first indication would bemore brake wear on one of the two axles, or like the man said, hard stops will cause nose dive or slow or lazy feeling brakes if its the rear working. I doubt it is a restriction but just a repositioning of the valve.
To correct or better said balance the proportioning valve, follow these steps. If you can determine which axle is doing all the braking, do so. Then look at the proportioning valve and you will see a pin protruding on one end. That confirs the valve is not centered. The way to center it and get your light on the dash to go off is as follows. Make sure wire is on the valve. Light should be on. Have some start the engine and press firmly on the brake pedal. Do the rear first. with pressure on the pedal, open quickly rhe brake bleeder . a click should be heard when the valve resets. Person on pedal should notice the light go out.. chk valve for pin no longer protruding. Do it twice if needed but make sure there is firm to hard pedal pressure. Check your fluid level. ALWAYS PROTECT YOUR EYE FROM THE BRAKE FLUID IN THIS PROCEEDURE.. iF THAT DID NOT RESET THE VALVE, tHEN YOU MAY HAVE TO DO THE FRONT SAME WAY. ccREATE LEAK ON AXLE THAT IS DOING ALL RTHE WORK.
When you get it right the light will go out - good luck

Posted on May 15, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Kia K2700 front brakes binding, new master and load censor.

check the adjustment of the pedal for the master cylinder
the rod attached to the pedal must be free about 1" movement before the master cylinder is activated
if the pistons in the master cylinder are not free of the compensating ports tyen hot brake fluid will push on the calliper pistons and apply the brakes
the load sensor is only a proportioning valve to allow more pressure to the rear brakes under a loaded situation
you may have to take it to an accredited brake specialist shop to properly diagnose the problem

Sep 28, 2016 | Kia Cars & Trucks

2 Answers

2007 Gmc W4500 can someone help me figure out why I cant keep brake pressure?

If you are loosing prime in the system but not loosing fluid my best guess would be the master cylinder.

Feb 17, 2016 | Cars & Trucks

2 Answers

Brake system all new but pedal goes to the floor

double check the brake master cylinder and brake piston cylinder.

Mar 11, 2015 | GMC Sierra Cars & Trucks

1 Answer

2000 electraglide, trying to bleed brakes on the rear master cylinder. I take the cap off master cylinder put a hose on bleeder valve, pump up break and hold it down crack the valve and nothing comes out....

does the pedal have pressure then go down after valve is cracked? With a hose on the nipple to a bottle to catch the fluid, press rear brake pedal down. Don\'t pump the brakes. Crack the bleeder valve while continuing to press down on the pedal. Once the pedal reaches the limit of its travel close the valve. Once the valve is closed; and not before; release the pedal and let it return to its at rest position. Repeat this process until you have good pedal without the need to pump, good clean fluid is coming out the valve, and no air is in the fluid coming out the valve. Be sure not to let the fluid in reservoir get too low or you will suck in air and need to start over and don\'t press the pedal too quickly or you can shoot a stream of brake fluid out the reservoir.

In very extreme cases, if you have lost prime in the master cylinder, it may be necessary to bleed the master cylinder first. THIS IS A LAST RESORT. Remove the brake line from the master cylinder. Try to limit the loss of fluid from the brake line to bare minimum. Thread a nipple into the master cylinder. Run a hose from the nipple into the reservoir. Be sure the hose stays submerged in the fluid in the reservoir and pump the brake until no bubbles come out the hose. Remove the nipple and reinstall the brake line. Slowly press down the brake pedal while tightening the line to minimize the air bubble in the brake line. Again be sure not to release the pedal until the line is tight. Then proceed to bleed the brakes as you normally would. Do not pump the brakes up. Just press the pedal down, crack the valve, close the valve, release the pedal, repeat.

Aug 24, 2014 | Cars & Trucks

1 Answer

1985 international truck brakes drag and wont release totally

Test to see if the brake pressure is being released at the wheels. First pump pedal several times are the wheels locked then open bleeder screw if fluid squirts out the fluid is not returning to the master cylinder then do this again this time release pressure at master cylinder wheels move then the master cylinder residual check valve has failed (need a master cylinder) if not then the flex hoses are restricted

May 07, 2014 | Cars & Trucks

1 Answer

Replaced slave cylinder and 2' of line

There is still air in the system or you have a faulty clutch master cylinder. Try disconnecting the line at the master cylinder and place your finger over the hole in the cylinder to act as a non-return valve, have someone gently press the pedal and if you cannot get pressure there and a suction when the pedal is released then replace the master cylinder as there is a blockage in the return and compensating ports.

Nov 16, 2013 | 2003 Mazda Tribute

1 Answer

Replaced rusted brake lines but did not replace valve in rear lines will this cause brake fade in 1995 bonneville

BY brake fade away I take it that you mean the pedal goes to the floor after you taken your foot off the brakes. . The valve you left out is a compensator valve that proportions the pressure between front and back to stop rear brake lock up and side skidding. I think the problem is in the master cyl in that the nonreturn valve under the second piston is not working and hold residiual pressure in the rear lines (Assuming they are drum brakes). If not you will need to bleed the m/cyl by cracking the lines at it one ata time and emptying the cylinder of trapped air allowing a full charge of fluid every time you pump the brakes.

Mar 10, 2013 | Cars & Trucks

1 Answer

No brake fluid to the rear wheel cylinders

You'll need to start bleeding the brake system at the Master cylinder to determine where the problem lies.

The lines coming out of the master cylinder will need to be loosened & bled there, initially you can just do the back ones to identify the problem, but once fixed, the system will have to be bled from the Master cylinder first, then the farthest wheel from it, then next farthest, then next, until you do the drivers wheel last.

This method of bleeding the brakes prevents air from crossing from one line to another, causing air to be left in the system.

Back to bleeding the rear brakes first: As someone pumps up the brake pressure, making sure the resivoir stays full, with the cap on between bleeding, and have the person pressing the pedal to do these thngs.
1. Always move the pedal slowly, pressing and releasing.
2. Never release the pressure on the pedal after bleeding a brake, until the line is tightened, then release slowly to prevent air from getting into the fluid.

You should of course get fluid at the master cylinder when you bleed it (or just replace it), then you'll need to bleed the line at the right rear wheel (first) a few times to get fluid if it's been leaking, then the left rear wheel. If you get pressure but no fluid to the rear and the master cyliinder did have pressure released when you bled it, there is either a restriction in the line itself, or the porportioning valve could be damaged. (unusual for the valve to go bad actually, inspect lines for damage such as being pinched if you're getting pressure but no fluid.

Final test if it hasn't been resolved-remove lines at porportioning valve & make sure fluid is leaving/entering there as it should. If you find it defective, a good replacement can come from a salvage yard, or you can buy them new.

Brake fluid on the floorboard under the dash near the brake pedal=bad Master Cylinder.

good luck

Feb 21, 2010 | 1996 GMC Jimmy

2 Answers

Brake problem

alot of new cars cannot be bleed correctly without a scanner to open the valve in the ABS motor. You may have to have a shop perform this job

Nov 05, 2009 | 2001 Nissan Sentra

1 Answer

I installed a master cylinder on a 1990 Aerostar van. The instructions that came with the part said not to bench bleed, it may cause leaks. I bleed it on the vehicle with the bleed screw on the master...

bleed it from wheel to wheel the one fartest from the cylinder andworking away around till yo are at the closest, you need a quart of dot 3 brake flid to do it and two people to do it, pump the pedal three times ad release the cylider valve and do so til yo get clear brake fluid do this which each wheel and keep filling the master cylinder, do this twice if it's working the pedal will keep rasing. if the pedal becomes sollid and still not all the way up then adjust the rear brake start wheels where te wheels barely touch the drums, aslo there is a compensating valve on the rear axle remove the nutthat holds it to the bed and open it wide open and continue to bleed, that should fix you up.

Jun 21, 2009 | 1986 Ford F 250

Not finding what you are looking for?
1998 Ford Explorer Logo

299 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

75077 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers


Level 3 Expert

5471 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides