Question about 1994 Ford F350 Crew Cab

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Rear brakes rabs valve

I just put on a new master cylinder a few months back hoping to fix the problem I am currently having. see my rear breaks seem to not be retracting back into place causing them to heat up and smoke the driver side seems to be worse than the passenger side could it potentially be the rabs/proportioning valve or can it be something else

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  • Ford Master
  • 1,449 Answers

Check for sticking sliders.

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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bigg t
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SOURCE: Rear disc brakes freezing up

Master cylinder may be bad or most likley air in the lines---bleed the brakes.

Posted on May 27, 2008

emissionwiz
  • 76630 Answers

SOURCE: Replacing a RABS Valve

In order to bleed the RABS there is a special tool that plugs into the connector of the RABS and holds the solenoids open to facilitate bleeding, you will need to take it to a brake specialists that has a tool to do this.

Posted on Oct 15, 2008

SOURCE: PROPORTIONAL VALVE ON MASTER CYLINDER LEAKING

it is not a dealer item is should come on the master if you buy a new one not a rebuilt some rebuilts have them

Posted on Dec 10, 2008

asetech74
  • 218 Answers

SOURCE: ford fivehundredright rear brake caliper wont retract

Is this the ratcheting style caliper? If so, you really should be using the proper tool to turn these style calipers back into their bore, and both calipers should turn clockwise to retract them back in. Also, if the piston was too far out you may have a hard time getting it to go back in. Hope this helps.

Posted on Mar 11, 2009

  • 65 Answers

SOURCE: 2005 f150 spongy brakes

it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help

Posted on Mar 24, 2009

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1 Answer

Proportioning valve 1988 f350


The reason is, you have a rear anti lock brake system. The anti lock valve is located on the frame just underneath the brake master. It is called a RABS valve. Almost impossible to bleed. But it can be done. A dealer has a tool that plugs into the RABS valve which activates the valve constantly moving the valve back and forth. This will then push all fluid and air out of your open bleeder screws in the rear.
I did'nt go to the dealer. i was too stubborn. My solution was to lift the rear of the truck and place on jack stands. Pinch off the rubber brake hoses on the 2 front brakes with a C-clamp or non marring vise grips, this will keep all fluid from going to front brakes. Next adjust the rear brake shoes by tightening the adjuster on the rear brake drums. Tighten the brakes on the rear until the brakes start to drag and the tires no longer spin freely by hand. Attach a bleeder hose to the bleeder screw on the RABS valve, place open end of hose into a jar or canister of brake fluid, so as not to draw in any air. Open the bleeder screw. Start the vehicle up, put it in gear, and let the rear tires spin. (I got up to 25mph on my speedometer) Step on the brake while it is in gear and the tires are spinning. This will activate the RABS valve and cause the air in the RABS valve to bleed. Do this several times. Put vehicle in park, shut off engine, and close the bleeder on the RABS valve. Attach bleeder hose to right rear of the truck, place open end of hose in a canister or jar of brake fluid so no air gets in and open the bleeder screw. Start the vehicle up, put it in gear, and let the rear wheels spin freely. As the wheels spin, you press your foot on the brake pedal, this will activate the RABS valve, and effectively bleed the brakes. Do this a dozen or so times, tighten the bleeder screw and do the other side. Remove clamps from front brake hoses and you will be go to go. All this may seem a bit extreme, but it is the only effective way to bleed a Rear Anti Lock Brake System on an early Ford. All the steps I laid out are necessary. You cannot skip one. The reason why the rear has to be in the air, is that there is a sensor mounted to the rear differential that senses wheel spin(or axle spin), this goes directly to the RABS valve and tells it that the tires are moving at a certain speed, and to activate the Rear Anti Lock Brakes when the brake pedal is depressed. It will not activate if it does not sense movement. The reason for pinching off the front brake lines, is that there are needle valves in the master cylinder and they will send too much fluid to the front calipers, and stifle or hinder the amount of fluid needed to go to the rabs valve and ultimately the rear wheel cylinders. It seems like a lot, and it is, but I did it and it works. Good luck

Mar 29, 2012 | Cars & Trucks

1 Answer

1995f350 wich line goes from MC to proportioning valve


Your vehicle is equipped with antilock brakes. It either has a "Rear Antilock Brake System" (RABS) or it is equipped with "4 Wheel Anti-Lock" (4WAL).

Some units use a pressure regulating valve that screws into the rear port on the master cylinder.
All units built in 1995 have lines that go to either the Hydraulic Control Unit (HCU) or to the RABS Valve. However, that vehicle does not use a conventional proportioning valve, so I am not sure what to tell you.

Sep 16, 2011 | 1995 Ford F350

3 Answers

Having trouble with drivers side rear brake....once brakes are replaced about 2 months later the drivers rear brake starts to grab and squeal like a train stopping keep having to replace....my mechanic and...


yes, because the master cylinder should let out equal pressure to both the back breaks. somthing might be causing the break to clamp harder than the other.

Jun 17, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

I had a low brake pedal so i changed the master cylinder but after the change pedal is higher but seems to be hard to push like i have no vacume fo the booster


did you hook the back blast valve back up to the booster mon........ also check the plastic valve in the line to the booster to make sure its working if that don;t fix it then either you have a bad booster or you put the wrong master cylinder on it cause the one for standard breaks? the hole in the end of the master cylinder isnt as deep and the one for power breaks

Jan 18, 2010 | 2003 Volvo XC90

2 Answers

I have a 1991 GMC Sonoma 2Wd with a 4.3 V6. I'm having trouble with the rear brakes still spinning. I just replaced all the brake parts in the back, wheel cylinders, drums, springs, etc. I replaced a line...


well your master cylinder would be most peoples guess however i am over qualified in hydraulic and air break systems you need to replace your equalizer valve its on the frame on the drivers side of the vehicle

Jan 15, 2010 | 1991 GMC Sonoma

2 Answers

I seem to have a problem with my hydro breaking system.Found front worn out while the rear shoes were covered with oil and had not been working for some time.After replacing calipers,rotors,shoes and wheel...


ALL YOU CAN DO IS FLUSH WITH CLEAN FLUID PUMP AND BLEED NOTE: ALWAYS START FROM THE FURTHEST WHEEL FROM THE MASTER CYLINDER AND WORK YOU WAY BACK. SOME TIMES YOU CAN OPEN THE LINES WITH COMPRESSED AIR WHEN YOU DISCONNECT ALL THE LINES FROM THE CYLINDERS

Aug 15, 2009 | GMC Sierra 3500HD Cars & Trucks

4 Answers

Pedal goes to floor on 92 F250


I would strongly recommend checking your trucks R.A.B.S. (Rear Antilock Brake System) valve . It is located on the left frame rail just under where your left foot would rest . They can leak internally and exhibit the problems you are describing (loss of pedal , with no fluid loss) .
It is highly unlikely that a power booster would cause this , as a failed booster will show itself in these ways . 1) a hissing sound when you apply the brakes (indicates a vacumm leak) 2) rough engine idle/stalling when brakes applied (also indicates a vacumm leak) or 3) No power assist (brake pedal hard to push) .
If you do discover your hydraulic problem is in your RABS valve , don't forget to bleed it ,(there is a bleeder valve on it) and the rear brakes again after you replace it .
Hope this helps
Doug

Oct 31, 2008 | 1992 Ford F250

1 Answer

F 250 brakes


Does the red break light come on the dash like when the park break is applied?
If so the check your proportioning valve if the truck has an abs system then the valve will be called a rabs valve.( located on the frame rail under the driver side seat) Check the break lines on the front calipers to see if they are damaged they may have been pinched so bad that they will not release. Also check to see If the master cylinder was changed , if the break lines were connected to the master cylinder incorrectly or the wrong master cylinder was installed the breaks will apply themselves…please rate this if it helped thx…

Oct 25, 2008 | 1997 Ford F250 SuperCab

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