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Thread: How to Reset Brake Proportioning Valve after fluid is cuttoff?

  1. 2nd August 2013, 11:18 PM #1
    oversite
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    How to Reset Brake Proportioning Valve after fluid is cuttoff?

    Hi all,

    My disco 1 ran out of brake fluid becasue the master cylinder was leaking, my understanding is that this has led to the proportioning valve to cutoff the fluid flow to the rear.

    I have now fixed the master clyinder and the rear brakes are not getting any fluid?

    so my question is how to I reset the brake proportioning valve? My mechanic thinks we will have to replace the unit but Im trying to save some $$.

    Thanks for any advice.
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  2. 3rd August 2013, 05:20 PM #2
    Discomark
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    No Idea but heres a pic of whats inside one, maybe worth pulling it apart to give it a clean before getting a new one.
    http://img19.imageshack.us/img19/953...enodiscov8.jpg
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  3. 4th August 2013, 07:41 AM #3
    oversite
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    Thanks Disco.

    Has anyone done this before?
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  4. 4th August 2013, 01:00 PM #4
    sheerluck Guest
    I tried, but totally failed to pull one apart.
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  5. 4th August 2013, 07:55 PM #5
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    460cixy
    460cixy is offline YarnMaster
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    This might be a dumb question but have you un done the fitting on the valve going to the rear and is there fluid there? Could be a colapsed hose on the rear or even blocked bleeders on the rear and may not be the valve at all
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  6. 4th August 2013, 11:07 PM #6
    oversite
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    Yeah its not comming out of the valve, we have isolated that as a problem.

    How has no-one done this before??
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  7. 5th August 2013, 08:44 AM #7
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    460cixy
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    If I had one here I would gladly pull it apart. Anyone want to donate one for dissection ? Maybe just try a wrecker and get a secondhand one
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  8. 5th August 2013, 08:49 AM #8
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    clubagreenie
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    Stupid idea but it's applicable for RRC so may also apply here.

    There's a switch on the side of the master cylinder that, when you run out of fluid, holds the piston in a different position inside the bore and uses the second circuit on the fronts only. You only need to unscrew it and the piston will return to it's usual position. Won't leak any fluid.
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  9. 5th August 2013, 08:58 AM #9
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    460cixy
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    Quote Originally Posted by clubagreenie View Post
    Stupid idea but it's applicable for RRC so may also apply here.

    There's a switch on the side of the master cylinder that, when you run out of fluid, holds the piston in a different position inside the bore and uses the second circuit on the fronts only. You only need to unscrew it and the piston will return to it's usual position. Won't leak any fluid.

    I was thinking about this but I would of thought it would part of the the prop valve it's self. But it won't have a effect on fluid flow what it does is detects a pressure differential between front and rear circuits and trips the light it won't open and close a circuit if all was well but the light needed reseting what your saying is correct
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  10. 5th August 2013, 09:11 AM #10
    sheerluck Guest
    Quote Originally Posted by oversite View Post
    Yeah its not comming out of the valve, we have isolated that as a problem.

    How has no-one done this before??
    I have a brand new valve in the shed with exactly the same issue as you are describing. I was replacing mine as the original was leaking, plus I had replaced the brake hoses all round.

    When I tried to bleed the brakes (mine's non-ABS) I got zero fluid through to the rear. I tried blowing some compressed air through, and nothing got through to the back.

    I tried undoing the big bolt at the rear of the valve, but it pulled the vice off my bench instead! And after all the messing about, I just bit the bullet and bought a replacement.
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