Here's the question,I put a 4th gen rear with discs in a few months ago,and haven't put a new propotioning valve in yet.I don't want to use an adjustable one.Will a 1LE proportioning valve help me out any.The discs on the rear are huge compared to the front so I will be upgrading to 1LE or Baer in the future,but for now i need better brakes.The front are doing all the work right now and i've been pushing my luck here lately.Thanks for any help guys.

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92RS,POLO GREEN

 

ttt

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92RS,POLO GREEN

 

ttt....come on guys....anyone? i'll even take a wild guess at this point...lol

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92RS,POLO GREEN

 

you wouldnt even have to get a 1LE prop valve to get it at least close to what it should be, even if you found an iroc or Z28 with 4-wheel disc it would be closer then you are now.

P.S- Im guessing that you had drums before????

Let me know what you find out, i want to put in a 4th gen rear also

 

I'd venture to say it has to do with how similar the brake systems were between the late 3rd (specifically 89-92) and 4th gen f-bodies. I searched thru carparts.com and they don't list any prop valves for 93-up f-bodies. They listed AC-Delco #172-2074 and AC-Delco #172-2038 for the 92 Z28, the 2074 looks like it's for rear discs.

Luck would be great if the 93-up's use the same prop valve as 89-92! I say give a few GM dealers a call, and ask for part #'s.

If the 93-up rear discs are larger or more powerful than 89-92 rear discs, you should probably hunt down a 4th gen prop valve. If they're the same size/power/etc, the 3rd gen one would probably do fine.

I was told the prop valve doesn't do any proportioning for 4-wheel-discs. It's just a combination valve, to split the m/c outputs into three, and give the BRAKE pressure warning light a home. If that's the case, then any 4-wheel-disc prop valve that fits your lines would work great.

But if the 93-up rear discs are huge, maybe this would screw something up? These are just guesses here, by the way...

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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

[This message has been edited by TomP (edited March 02, 2001).]

 

Hey thanks guys,even the guesses help,lol
it did have drums and yes the rotors in the rear are 12"s i believe.The brakes work well enough to slow me down,but the rear aren't doing anything.The only reason i was thinking of the 1LE valve is cause it uses the 12" rotors on 4 corners.I'll look into the 4th gen proportioning valve,i may call thirdgen parts and see what he has available,thanks for the replys........

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92RS,POLO GREEN

 

you need GM part # 10136840

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82Z 305 w/comp 270 magnum cam,holly.TH700R4 w/B&M holeshot 2000 converter,& megashifter.1LE front brakes, 9bolt 3.27 w/1LE rear brakes.Aluminum driveshaft,boxed rear susp.,IROC swaybar+wonderbar. 70mph@2200rpm ASE Master Tech plus L2
also recently obtained a
'69 chevelle SS396 w/Turbo 400,3.31 posi,11.0 to 1, headers,etc. Latest project car,'86 IROC stock 305TPI hit on left side,but not too bad

 

Thanks Andy............

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92RS,POLO GREEN