 who rebuilds - proportioning valves ?, and master cylinders ?? |
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| jimkelly |
 Apr 8 2010, 08:03 PM
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Delaware USA  Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region  |
i was wondering?
jim |
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| URY914 |
Apr 8 2010, 08:22 PM
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,466 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
No one should be.
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| underthetire |
Apr 8 2010, 09:37 PM
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
QUOTE(jimkelly @ Apr 8 2010, 07:03 PM)  i was wondering? jim Masters are easy to re-build, but the seals kit are not available any more. |
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| Cap'n Krusty |
Apr 8 2010, 09:38 PM
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(jimkelly @ Apr 8 2010, 07:03 PM) i was wondering? jim No one in their right mind. Or, maybe, no one without massive liability insurance. The Cap'n |
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| realred914 |
Apr 9 2010, 10:50 AM
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#5
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Senior Member Group: Retired Members Posts: 1,086 Joined: 1-April 10 From: california Member No.: 11,541 Region Association: None |
i believe it is PMB that does 914 brake work, i know they do the calipers, give them a call. I dont have his number right now. sorry
or suggest you call rich at 650 364-6234 and see what he has to offer. he does sell the calipers that PMB rebuilds so he should know. |
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| 914Sixer |
Apr 9 2010, 11:35 AM
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#6
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914 Guru Group: Members Posts: 8,877 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Proportioning valves can be redone by Wilhoit Restorations in Long Beach, Ca, They do mostly 356 stuff but advertise redoing prop valves.
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| realred914 |
Apr 9 2010, 11:46 AM
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#7
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Senior Member Group: Retired Members Posts: 1,086 Joined: 1-April 10 From: california Member No.: 11,541 Region Association: None |
QUOTE(914Sixer @ Apr 9 2010, 10:35 AM) Proportioning valves can be redone by Wilhoit Restorations in Long Beach, Ca, They do mostly 356 stuff but advertise redoing prop valves. they are no fly by night outfit either, they have a very good reputation in the 356 world |
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| Joe Bob |
Apr 9 2010, 12:19 PM
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Take the P-Valve out and put in a tee from a VW squareback....go with a new 19mm 911 master. They are cheap.
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| URY914 |
Apr 9 2010, 01:20 PM
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#9
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,466 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
As Mr Suave said........
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| streetrover |
Apr 11 2010, 12:12 PM
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#10
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Member Group: Members Posts: 87 Joined: 22-December 09 From: Inland Empire Member No.: 11,163 Region Association: Southern California |
QUOTE(jimkelly @ Apr 8 2010, 07:03 PM) i was wondering? jim Just curious . . . what EXACTLY do these proportioning valves do? What happens if you eliminate the valve (as shown in the pix posted by URY914)? |
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| Joe Bob |
Apr 11 2010, 06:30 PM
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#11
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
65/35 or thereabouts bias to the front. Keeps the rears from locking up before the fronts, which is a BAD thing. Removing the valve brings it closer to 50/50 as the front brake pads are larger than the rears.
Going to bigger calipers on the fronts is good thing with the valve removed. |
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| McMark |
Apr 12 2010, 12:35 AM
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#12
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Technically speaking, it doesn't proportion anything. It's a limit valve. It keeps the pressure that's going to the rear brakes from rising above a certain level, whereas the fronts are free to keep rising. At low brake pressures you have the same pressure at the front as you do at the rear. A true proportioning valve would mean less pressure to the rears even as low levels.
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