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Old 04-04-2010, 07:55 PM
W1D0MAK3R W1D0MAK3R is offline
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Default Brake Porportioning valve

What are the implications of cutting out the porportioning valve in the braking system, I know it is used to engage the rear drum brakes just before the front. I did the the rear disk brake swap on my 92 ranger, and Ive determined the porportioning valve is siezed up due to the fact that no fliud will flow through the rear lines. With disks now on the back will this valve even be necessary? How will this affect braking and handling of the truck?
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Old 04-05-2010, 09:17 AM
Daedalus Daedalus is offline
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Default Re: Brake Porportioning valve

Not a good idea. You want your front brakes to do most of the braking, thats what the valve does.
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Old 04-05-2010, 05:41 PM
Scottg Scottg is offline
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Default Re: Brake Porportioning valve

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Originally Posted by Daedalus View Post
Not a good idea. You want your front brakes to do most of the braking, thats what the valve does.

if he has disc front and rear, the rear will be undersized from the front, meaning the front will still do most the braking. Its my understanding that explorers with All wheel disc had NO proportioning valve
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Old 04-05-2010, 05:42 PM
Fx4wannabe01 Fx4wannabe01 is offline
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Default

rear disc swaps require a new adjustable proportioning valve on non-4whl abs equipped trucks. cutting it out completely is definately not a good idea. getting a new one is required for proper fluid force distribution.

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Originally Posted by Scottg View Post
if he has disc front and rear, the rear will be undersized from the front, meaning the front will still do most the braking. Its my understanding that explorers with All wheel disc had NO proportioning valve
You're right....i don't think they do either. BUT....they are also all 4whel disc, so the distribution of fluids is all done electronically.
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Old 04-06-2010, 09:45 PM
W1D0MAK3R W1D0MAK3R is offline
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Default Re: Brake Porportioning valve

Actually I got the parts off of a 94 mustang, but the porportioning valve only has the line for the rear brakes going into it and out of it. thats it, front brakes are a go from the master straight to the caliper, but the rear line ran into this valve then on to split off to each drum. but since I put the new stuff on, with disks on both front and back, I wasnt sure I would need it anymore. the front brakes still operate at the same pressure its just that without this valve, all of the brakes would engage at the same time. And yes the rears are smaller so they would have less of an effect on stopping power then the front. But during tests the truck seemed to stop a bit more level then before. My truck is a 5spd as well so Ive always used downshifting to do part of the work in keeping the truck strait during winter while braking. Which the extra drag the downshifting creates through the rear wheels is enough to be taken in consideration as well
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