Question about 1984 Chevrolet S-10

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To anyone familiar with 1984 Chevy s10 pickups. I have been having brake issues for a few months now. Checked the pads and shoes they are fine. However I seem to be leaking brake fluid from beneath the per-portioning valve next to the master cylinder. its not leaking from any fittings, its leaking from a hole at the bottom. The hole looks and feels like its supposed to be there and only leaks when the brakes are compressed. I did buy a new master cylinder anyways just because it may need it in the future and Ill be working on the brakes. Could I need a new per-portioning valve. I was told that they rarely brake on these trucks. The pedal goes straight to the floor and it leaks all the fluid at the one point and nowhere else. Any suggestions would be most helpful. Also anyone have a DIY on bleeding a brake system??

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I have an 1984 S10 Blazer,bought it new.

Replace the leaking valve on the bracket below the master,your taking about.

Posted on Oct 08, 2010

  • ronnie_dehar Oct 14, 2010

    OK new situation with the valve. Im using a 9/16 flare pipe wrench, to remove all the hydrolic fittings from the proportioning valve. However the fittings are so tight that its starting to strip the bolts hold the fittings into the valve. I dowsed it with penetrating fluid with no luck. Any suggestions. Also GM doesn't manufacture the valve. I found a used one but its for a 88. Will it work. They look identical. One last thing, Im thinking about replacing the master cylinder as well anyone have a DIY for this. Thanks in advance.

  • Anonymous Oct 14, 2010

    The tight fittings doesn't supprise me
    You could try a hair dryer, to heat the valve ,and possibly expand,an open flame may not go over well with brake fluid.
    I need the same valve,so I hadn't checked myself,but figured an auto parts store or one of the restoration companies.
    Try not to twist that line or you will need to reflair it.
    Don't know about the 88 valve
    The master should be no problem,parts store for a rebuilt
    I would just remove the retaining ring and take apart and clean,unless the seals are shot.
    Haven't done a kit since the 1960's

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