Question about 1998 Ford F150 Regular Cab

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Replacing a RABS Valve

I need to replaces the RABS (rear antilock brake system) valve on my 98 Ford F-150 and I need to know how to bleed the brakes.

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  • webpilot100 Sep 26, 2008

    How do I bleed the RABS valve?

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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

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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

1 Answer

I have a 1989 ford f 150 the rear brake line is rotted off from the drivers door back. i can t seem to find where it goes


the brake line goes from the rabs valve to a rubber hose near the rear end. It is ran behind the fuel tank.

Feb 01, 2010 | 1990 Ford F150

2 Answers

Brake pedal dropping to floor


do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.

Oct 18, 2009 | 1994 Chevrolet S-10

3 Answers

Brake peddle goes to the floor intermitantly.


The problem may be that the master cylinder needs to be bench bled,there is most likely air trapped in the piston of the master cylinder.The problem comes from the piston not being fully actuated when connected to the pedal assembly.A vacuum bleeder will generally pull it out.

May 25, 2009 | 2004 Dodge Ram 2500

2 Answers

I need to know how to bleed the brakes on a 1999 chevy blazer


Start from right rear, then, left rear, right front, left front. Fill master cylinder. Have helper sit in car, have helper hold brake pedal down. open bleed screw. fluid and air comes out. close screw. release brake pedal. Continue until no air comes out. Move to next wheel. Keep an eye on master cylinder fluid level after each wheel.

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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

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