 Proportioning Valve, replace with a "T" |
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| rmital |
 Feb 8 2006, 12:54 PM
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#1
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Northeast optimist  Group: Members Posts: 1,947 Joined: 12-December 05 From: Park Ridge, NJ Member No.: 5,268  |
Brake system just about completely replace....master cylinder, all lines, etc. Just the proportioning valve still original.
Part A: Bleeding still producing a sloppy brake pedal...too much play. I'm hoping replacing the proportioning valve with a "T" will solve my problem. Has anyone had success with this? Part B: Considering how the car is balanced, will the "T" replacement be safe...no fishtailing? I hope I was clear with my description...be kind. Thanks, Ray |
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Replies(20 - 31)
| 914-8 |
Feb 8 2006, 05:14 PM
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#21
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Senior Member Group: Members Posts: 802 Joined: 23-January 06 From: Cal Member No.: 5,461 Region Association: None |
+1 on that - what's a good source for a T?
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| Eric_Shea |
Feb 8 2006, 07:08 PM
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#22
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
www.cip1.com or James Adams here sells them (Resource section)
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| Eric_Shea |
Feb 8 2006, 07:09 PM
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#23
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Here's the actual product link hard to beat $4.95 (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
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| cobra94563 |
Feb 8 2006, 09:41 PM
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#24
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Chris Group: Members Posts: 341 Joined: 1-March 05 From: San Francisco Member No.: 3,696 |
Thank you, Eric.
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| Always Looking |
Feb 8 2006, 09:48 PM
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#25
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Member Group: Members Posts: 194 Joined: 9-December 04 From: Orange, CA Member No.: 3,246 |
1980 BMW 320i fronts, stock rears-
Replace with a T? (or adjust P-valve?) Good discussion. (IMG:http://www.914world.com/bbs2/html/emoticons/beer.gif) |
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| J P Stein |
Feb 8 2006, 09:53 PM
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#26
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Yeah, itteration # 73 if my memory serves ....which is questionable, I fear. (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) |
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| rmital |
Feb 8 2006, 10:03 PM
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#27
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Northeast optimist Group: Members Posts: 1,947 Joined: 12-December 05 From: Park Ridge, NJ Member No.: 5,268 |
Thanks for all the great responses.... I'm definitely concerned about the rear brake adjustments. What the heck is the check on that? When depressing the brake pedal, it just kind of travels pretty much right to the floor board. Not really spongy, just consistent right to the floor. Hopefully we could get a better bleed tomorrow. Maybe a sucking power bleeder would be better than a blowing bleeder.......to pull the air out of the pvalve....if that's the case. ...since pumping the crap out of the brake pedal didn't work! This is really killing me... |
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| r_towle |
Feb 8 2006, 10:06 PM
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#28
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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The stock p-valve is designed to not let fluid through until pedal force, or fluid force reaches something like 750 lbs...
Here is how I do it...it works for me... bleed the whole system twice, till you get decent pressure.. then push on the brake pedal really hard for about 3-5 minutes...you feel the air bubbles slowly work through the valve...the pedal kinda bumps on the way down each time a bubble goes through... I had to do this twice...just the other night.. Your leg will get real tired...but you will get all the air past the valve.. Then bleed the system twice more... now the pedal should be right up to the top... this assumes venting clearance is correct, and push rod is set to the right length... the air seems to be trapped just in front of the valve...so you have to push it through the valve... Car has great brakes now. Rich |
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| pek771 |
Feb 8 2006, 10:13 PM
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#29
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Member Group: Members Posts: 273 Joined: 23-November 05 From: Conover, NC Member No.: 5,175 Region Association: None
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Drive that buggy up the hill, and I'll take a look at them for you. I want to see what your car looks like anyway!
Pat |
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| Eric_Shea |
Feb 8 2006, 10:20 PM
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#30
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
320's have the same piston as the M-caliper. With stock rears, T.
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| 914-8 |
Feb 8 2006, 11:09 PM
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#31
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Senior Member Group: Members Posts: 802 Joined: 23-January 06 From: Cal Member No.: 5,461 Region Association: None |
Does that just bolt right up in place of the P valve? |
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| Eric_Shea |
Feb 8 2006, 11:13 PM
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#32
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Pretty much. Minor bending and tweaking. Minor.
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