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Username Post: where to buy proportioning valves. . .89-94        (Topic#348942)
Forum Newbie
Posts: 10

Reg: 12-29-17
12-31-17 05:54 PM - Post#2719578    

88 seems to be available, and so does 95 and up , but where do ya find valves for 89 - 94....

carolina classics has them but cant seem to find anywhere else. . .

Valued Contributor
Posts: 3965
Age: 35
Loc: wv
Reg: 08-29-12
01-01-18 08:43 AM - Post#2719639    
    In response to letsgo7815

Are you keeping the RWAL? If not just get a Wilwood adjustable.


'88 Chevy K3500, aluminum head roller cam 511inĀ³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

Forum Newbie
Posts: 10

Reg: 12-29-17
01-01-18 01:22 PM - Post#2719691    
    In response to bowtie44s

what if any would be the difference in the 88 , vs the 89 - 94. . . .every pic i find it looks identicle....i might try one used. . .

Posts: 28694
Age: 48
Loc: Texas
Reg: 08-01-03
01-01-18 01:43 PM - Post#2719692    
    In response to letsgo7815

On the GMT400 body pickup, 88-94 should all be the same. You may be seeing a part listing for the old squarebody which was also made in 88. Not sure if that part is the same; wouldn't bet on it, but it might be.

Used is probably a decent bet as these don't often go bad, but I could also say with this many years on them and people's tendency to never flush out brake fluid, excessive moisture in the fluid may have ruined more than a few by now.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

Forum Newbie
Posts: 10

Reg: 12-29-17
01-01-18 02:08 PM - Post#2719695    
    In response to someotherguy

Ok ill try an 88 if this guy gets back to me. . .

I have no rear brakes right now and the rear plunger on the valve is all the way in. . . I changed the master as old on had moisture and goo in it. . .

Ill let ya know what happens

Posts: 48

Reg: 01-01-18
01-02-18 12:28 PM - Post#2719783    
    In response to letsgo7815

Sharing what worked for me.

I used a proportioning valve from an S10, it has the same port spacing top & bottom, just had to transfer my mount bracket.
Works fine, the S10 valve is for front discs and rear drums.

You would need to use the old mount bracket, grind off the peened aluminum (bottom of valve) on the old valve, remove old bracket
then attach old bracket to the new valve, same mount point. Just have to peen the aluminum over on the new valve, I put new valve
in a vice ,used hammer and flat punch to peen metal on bracket. When peening,make sure the valve is facing the right way, it can be mounted
either small or large port to the front or rear.

The bracket that comes with the S10 valve comes not attached so no need to remove bracket on the new valve. There is plenty
of fresh aluminum on the aluminum mount point to make a good factory type peen.

This proportioning valve ng-Valve...

The picture shows large port to front, this can be turned around because the valve does not come with the bracket mounted.
Thats how you can use your bracket.

'92 K1500 Blazer Z71 350TBI 700R4 , 253,000 miles
'94 C1500 Cheyenne WT 350TBI 4L60e , 565,000 miles

Forum Newbie
Posts: 10

Reg: 12-29-17
01-02-18 06:27 PM - Post#2719824    
    In response to runamukker

well gm said the 88 is completely different so after a lengthily discussion i decided to stick with the 89 - 94 valve.

i did find one after much searching used.
changed it
and voila , ... rear brakes. . .

this just goes to show that even without a brake light on the dash , and after testing with a test light , proportioning valve was still bad.

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