91 Disc/Disc Prop Valve question
#4
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Re: 91 Disc/Disc Prop Valve question
Good question.
You could retain the drum valve (I assume that's what's currently in the car). While it would work, best braking performance wouldn't be achieved.
You might try to find a fitting and/or fittings that would accommodate your 91's M1.5 tube nut threads at one end and the 87's M1.0 tube nut threads at the valve. I have no idea if such a fitting exists or whether it would work.
You could cut the lines, slip on the correct fittings from an 84-88 and reflare the lines. How much grief that would cause, I'm uncertain.
Hopefully, some who has experienced your issue will chime in.
EDIT: You could swap to bigger brakes, such as the so-called 1LE's (PBR's and 11.7" rotors) and simply use the correct second design 1LE valve, which would bolt up to your 91.
http://www.flynbye.com/catalog/i172.html
JamesC
You could retain the drum valve (I assume that's what's currently in the car). While it would work, best braking performance wouldn't be achieved.
You might try to find a fitting and/or fittings that would accommodate your 91's M1.5 tube nut threads at one end and the 87's M1.0 tube nut threads at the valve. I have no idea if such a fitting exists or whether it would work.
You could cut the lines, slip on the correct fittings from an 84-88 and reflare the lines. How much grief that would cause, I'm uncertain.
Hopefully, some who has experienced your issue will chime in.
EDIT: You could swap to bigger brakes, such as the so-called 1LE's (PBR's and 11.7" rotors) and simply use the correct second design 1LE valve, which would bolt up to your 91.
http://www.flynbye.com/catalog/i172.html
JamesC
Last edited by JamesC; 12-06-2011 at 04:07 PM.
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Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: 91 Disc/Disc Prop Valve question
You could try an adjustable proportioning valve. Not sure what fittings work with which ones etc.
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#9
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Re: 91 Disc/Disc Prop Valve question
Hey, Pat,
Replying to your PM:
Using the tap/die method would be new territory for me. Frankly, I don't know whether it would work or not. I'd think the easiest method would be to throw in an adjustable.
Where part numbers for the disc/disc combination valve is concerned, the following is from my 82-91 Parts and Illustration Cat:
Valve, Comb (J65) (1986-88) 14089497
I suggest any 84-88 valve (as long as it's the alum type) would work. I'd hit the bone yards and see what's available.
JamesC
Replying to your PM:
Using the tap/die method would be new territory for me. Frankly, I don't know whether it would work or not. I'd think the easiest method would be to throw in an adjustable.
Where part numbers for the disc/disc combination valve is concerned, the following is from my 82-91 Parts and Illustration Cat:
Valve, Comb (J65) (1986-88) 14089497
I suggest any 84-88 valve (as long as it's the alum type) would work. I'd hit the bone yards and see what's available.
JamesC
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: 91 Disc/Disc Prop Valve question
You will NOT be able to rethread the valve. The fitting size is too close and the threaded port has a tapered seat at the bottom and if you damage it you will never be able to get the lines to seal. Only thought I had would be to swap the guts of one valve into the other, I believe they are compatable internally. I would try this long before trying to retap the valve and if that all fails, go with an adjustable vave.
#12
Re: 91 Disc/Disc Prop Valve question
what adjustable valve do i get? and how hard is it to adjust it? that kinda sounds like a pain in the butt, plus if it is adjustable with a **** couldnt it easily come out of adjustment over time, just by road vibration or whatever?
Can I use the late 1LE valve wth the iron calipers? But from what im told that vale is near impossible to get...
Can I use the late 1LE valve wth the iron calipers? But from what im told that vale is near impossible to get...
#13
Re: 91 Disc/Disc Prop Valve question
Actaullay I think I found a 10164112. think thats exactly what i need.... Gmpartsdirect.com showed it then i clicked on it and went to check out and they wanted 416 bucks for teh shipping... what a scam.. but i found it somewhere else
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