Brake Proportioning Valve and ABS & RABS - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 01-31-2007
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Brake Proportioning Valve and ABS & RABS

Brake Proportioning Valve and ABS, are they related.

In other words my plan is to run the rear disc brake kit on my 31 spline and i know that the Brake Proportioning Valve (or whatever) know to change the amount of brake pressure front to rear, because from my understanding the discs will require less.

Now when i switch to this kit my ABS will no longer work because of the New front axle.

So if the ABS module is errored out will the Brake Proportioning Valve work correctly still?

Now another question is can i make my ABS module still work on the rear if my new 31 spline supports that?
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Old 01-31-2007
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Quote:
Originally Posted by zabeard
So if the ABS module is errored out will the Brake Proportioning Valve work correctly still?
the proportioning valve is in the line......the ABS wont affect it...
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Old 01-31-2007
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Zach, your truck doesn't have a proportioning valve. From 2001-on, Rangers have Electronic Brake Force Distribution which is proportioning done by the ABS. Using the ABS sensors, the front to rear slip ratio is calculated in software. The line pressures are then adjusted to balance front to rear braking, driving the slip ratio toward 1.

If you disable the ABS, you will also disable the EBFD and probably have severe rear brake lock up problems during heavy braking.

One possible solution might be to add an adjustable proportioning valve to your brake system and then dial it in after the conversion is complete. You can get one from FRPP or Summit for about $50~100.
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Old 01-31-2007
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Well besides my terminology i was kinda close. lol

that kinda sucks.. what about pre2000? can i pull the ABS module off of it or how does that work and can i make it adapt?

Jey had to do something funky with his i think but idk what he did.

Snow + rear lockup isnt cool...

So with something like this...
http://store.summitracing.com/partde...5&autoview=sku
or
http://store.summitracing.com/partde...5&autoview=sku

I put that in the rear brake line somewhere and then control the amoutn of pressure it applies to the rear brakes. that would be just less of what it takes to get them to lock up on HARD brakeing.... I assume?
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Old 01-31-2007
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What about converting to RABS using the RABS hydraulics and controller from an earlier Ranger...or is that basically what you just suggested? I think it could be easily done...
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Old 01-31-2007
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yea that is what i was suggesting.. wondering if it could be done.
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Old 01-31-2007
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Pre-2000 had 2 systems. RABS was standard on most Rangers, 4WABS was optional on some models, standard on others.

To adapt the RABS, I think you would need all of the RABS hardware including the RABS proportioning valve and a RABS module with it's wiring. My guess is that you could continue to use your existing ABS sensor on the rear diff. All this is total guesswork, of course. It may be a straightforward swap or it might be the proverbial 'can of worms'.
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Old 01-31-2007
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if you realy want; call a dealership. Find out if they will change the ratio fo the axles and the tire size in the comp.
The PCM is able to make the changes in the programming for the periferals involving pressures and and speeds.

Should work but find out from the dealership. They can call engineers and get advice from them.

It's an idea if you want to follow threw and know your options.
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Old 01-31-2007
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Quote:
Originally Posted by htvfd460stx
if you realy want; call a dealership. Find out if they will change the ratio fo the axles and the tire size in the comp.
The PCM is able to make the changes in the programming for the periferals involving pressures and and speeds.

Should work but find out from the dealership. They can call engineers and get advice from them.

It's an idea if you want to follow threw and know your options.
What dealers can do and what they will do is two different stories. I tried for a while to find a dealer to change my tire size but they all refused to do it.
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Old 01-31-2007
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If you get the adjustable one that would work Zach like Bob said. It would be the way to go.
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Old 01-31-2007
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yeah that is prolly what i will do if i have issues. which i prolly will. but its only 50 bucks.
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