Proportioning valve question on 1LE conversion...

[chazman]

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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[JamesC]

Originally Posted by chazman

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?

I'm not exactly answering your question; however, I converted to both the 1LE fronts and PBR rears. I use the 1LE proportioning valve along with what would be an OE master on an 89+ car. The link I provided elsewhere on the 1LE conversion also has info on PBR's (and what proportioning valve and master are required) that you may find interesting.

JamesC

[Dokken10]

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.

[Dokken10]

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.

[chazman]

I emailed Spohn. They said my prop valve would be fine.

[Dokken10]

It seems the main issue with P/Vs is the threads. Makes me wonder if there are any thread issues with the flex lines.

[JamesC]

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

[Dokken10]

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?

[JamesC]

Originally Posted by Dokken10

The hard lines from the P/V to flex lines have the same thread count from 82-92?

By flex lines, I'm talking about the line from hardline to caliper.

JamesC

[Dokken10]

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?

[JamesC]

Originally Posted by Dokken10

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?

I upgraded my 85 to 1LE. Because of thread count, I used the first design proportioning valve. It was a simple bolt-up to existing lines,(2 & 4). Since 82-83 had some SAE pieces, I'd guess 84+ are the same (5 & 6).

[Dokken10]

Originally Posted by JamesC

I upgraded my 85 to 1LE. Because of thread count, I used the first design proportioning valve. It was a simple bolt-up to existing lines,(2 & 4). Since 82-83 had some SAE pieces, I'd guess 84+ are the same (5 & 6).

I'm more concerned about the 4 & 5 connection.

[JamesC]

Originally Posted by Dokken10

I'm more concerned about the 4 & 5 connection.

I've never heard of anyone having issues there--I didn't.

JamesC