Proportioning valve question on 1LE conversion...
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Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Proportioning valve question on 1LE conversion...
For you guys who've converted to 1LE front brakes on '89 and up cars with the factory rear PBR brakes - do you need a different proportioning valve?
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Re: Proportioning valve question on 1LE conversion...
JamesC
Last edited by JamesC; 05-29-2009 at 10:28 AM.
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Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Proportioning valve question on 1LE conversion...
I have the same question.
I have a 91 GTA with factory PBR rear brakes and I'm thinking of installing 1LE front brakes. I believe its the same proportioning valve as I have right now.
JamesC, could you post a link?
Thx.
I have a 91 GTA with factory PBR rear brakes and I'm thinking of installing 1LE front brakes. I believe its the same proportioning valve as I have right now.
JamesC, could you post a link?
Thx.
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Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Proportioning valve question on 1LE conversion...
From what I have found in a search and in my parts catalog a 91-92 J65(front and rear disc) cars used the same P/V as an 1LE car.
Seems like 89-90 is a lot harder to figure out.
Seems like 89-90 is a lot harder to figure out.
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Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Proportioning valve question on 1LE conversion...
I emailed Spohn. They said my prop valve would be fine.
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Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Proportioning valve question on 1LE conversion...
It seems the main issue with P/Vs is the threads. Makes me wonder if there are any thread issues with the flex lines.
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Re: Proportioning valve question on 1LE conversion...
I have a 91 GTA with factory PBR rear brakes and I'm thinking of installing 1LE front brakes. I believe its the same proportioning valve as I have right now.
JamesC, could you post a link?
The following link is the original how-to:
http://web.archive.org/web/200605221.../1LEbrake.html
The flex lines aren't an issue.
JamesC
JamesC, could you post a link?
The following link is the original how-to:
http://web.archive.org/web/200605221.../1LEbrake.html
The flex lines aren't an issue.
JamesC
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Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Proportioning valve question on 1LE conversion...
The main issue is the thread count on the M/C, P/V and the short hard lines that connect them. The hard lines from the P/V to flex lines have the same thread count from 82-92?
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Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Proportioning valve question on 1LE conversion...
Lets get on the same page. Listed in order starting at the M/C.
1. M/C
2. Short hardlines.
3. P/V
4. Hardlines to the flex(rubber, soft)lines.
5. Flex lines
6. Calipers.
Is the thread count the same where 4 and 5 connect the same from 82-92?
Or is it just the thread count between 1, 2 ,3 and 4 the issue between the years?
1. M/C
2. Short hardlines.
3. P/V
4. Hardlines to the flex(rubber, soft)lines.
5. Flex lines
6. Calipers.
Is the thread count the same where 4 and 5 connect the same from 82-92?
Or is it just the thread count between 1, 2 ,3 and 4 the issue between the years?
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Re: Proportioning valve question on 1LE conversion...
Lets get on the same page. Listed in order starting at the M/C.
1. M/C
2. Short hardlines.
3. P/V
4. Hardlines to the flex(rubber, soft)lines.
5. Flex lines
6. Calipers.
Is the thread count the same where 4 and 5 connect the same from 82-92?
Or is it just the thread count between 1, 2 ,3 and 4 the issue between the years?
1. M/C
2. Short hardlines.
3. P/V
4. Hardlines to the flex(rubber, soft)lines.
5. Flex lines
6. Calipers.
Is the thread count the same where 4 and 5 connect the same from 82-92?
Or is it just the thread count between 1, 2 ,3 and 4 the issue between the years?
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Car: 92 RS(sold) 1989 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: ones that turn
Re: Proportioning valve question on 1LE conversion...
Brining this thread back from the dead instead of starting a new one. Does anyone know for sure that the 1le, and 89-92 j65 cars use the same proportioning valve? I did a c4HD conversion on my car a few years ago, and braking has seemed to be sub par, and since this is basically the same as a 1LE setup I wanted to make sure I have the correct prop valve.
The car in question is 89 Iroc with J65.
The car in question is 89 Iroc with J65.
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Car: 92 RS(sold) 1989 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: ones that turn
Re: Proportioning valve question on 1LE conversion...
I keep getting mixed answers
According to this thread they are the same
https://www.thirdgen.org/forums/brak...-answered.html
According to this thread they are the same
https://www.thirdgen.org/forums/brak...-answered.html
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Car: 92 RS(sold) 1989 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: ones that turn
Re: Proportioning valve question on 1LE conversion...
That's the answer I was hoping for thanks james
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