 Rear brake pressure regulator valve, Brake repair |
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| DamonsCarrera |
 Nov 24 2013, 06:26 PM
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#1
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Newbie  Group: Members Posts: 36 Joined: 2-September 12 From: Chicago IL Member No.: 14,886 Region Association: Upper MidWest  |
The brake pedal on my 914-6 is very spongy, even after repeated bleeding with a pressure bleeder. I isolated the problem to the brake-proportioning valve or pressure regulator. I cannot seem to get the brakes properly bled with this valve in the system.
I've read other posts by some here and it seems this valve is a source of some debate . Is there some trick to bleeding the brakes with it? Do I need to bleed the brakes the old-fashioned way, have someone push on the brake pedal? |
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| GeorgeRud |
Dec 21 2013, 05:41 PM
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#2
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
I wonder if an additional bleeder at the highest point of the system wouldn't help getting a solid pedal. I did install a T fitting many years ago (sorry, Eric), and have had a very solid pedal, but I certainly can understand the purpose of the regulator. I assume that 911s and VW Beetles didn't need these because of the higher polar moment of inertia compared to the 914 design.
I also think that flexing of the floorboars where the master cylinder is mounted also contributes to the spongy pedal feel. Eric's master cylinder brace should help address the movement quite easily (or there are posts on how to use hoseclamps and metal to achieve the same effect, but much less elegantly). |
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Posts in this topic
DamonsCarrera Rear brake pressure regulator valve Nov 24 2013, 06:26 PM
toolguy No trick concerning the proportioning valve. . . a... Nov 24 2013, 06:40 PM DamonsCarrera Thanks for your input toolguy. I guess I will try... Nov 24 2013, 07:17 PM nine9three Everybody needs these: http://speedbleeder.com/ Nov 24 2013, 08:44 PM toolguy Air seeping past the bleeder threads on the calipe... Nov 24 2013, 08:46 PM 914_teener :agree:
+1 Nov 24 2013, 08:47 PM
gothspeed
:agree:
+1
+2 .... :agree: Nov 24 2013, 09:37 PM Mark Henry If you don't mind the super-fund clean-up mess... Nov 24 2013, 08:56 PM barefoot
If you don't mind the super-fund clean-up mes... Jan 25 2014, 12:01 PM ConeDodger Don't remove the valve. You will eventually co... Nov 24 2013, 09:05 PM walterolin Speed bleeders (above). I did my '70 4 cyl la... Nov 24 2013, 09:29 PM r_towle After you think you are done, drive it and slam th... Nov 24 2013, 09:47 PM DamonsCarrera Thanks for all the advice guys.
Mark, besides b... Nov 25 2013, 05:56 AM Eric_Shea There is no aftermarket valve.
It is a "pres... Nov 25 2013, 05:24 PM DamonsCarrera I think there are other aftermarket valves availab... Nov 25 2013, 07:47 PM Racer Chris There is nothing about the pressure regulator whic... Nov 25 2013, 11:32 PM Racer Chris
There is nothing about the pressure regulator whi... Dec 22 2013, 10:31 PM Eric_Shea
There's 100's of bias proportioning valv... Nov 27 2013, 04:24 PM DamonsCarrera Sorry for the late response. Work has been a bear... Dec 21 2013, 03:51 PM DamonsCarrera The highest point would probably be the at the top... Dec 21 2013, 08:51 PM DamonsCarrera I've decided for now to replace the factory pr... Dec 22 2013, 01:13 PM r_towle
The brake pedal on my 914-6 is very spongy, even ... Dec 22 2013, 04:24 PM Eric_Shea Wrong move. All the Tilton can do is reduce fluid ... Dec 22 2013, 11:48 PM SirAndy Wrong move. All the Tilton can do is reduce fluid ... Dec 23 2013, 03:15 AM Racer Chris
Wrong move. All the Tilton can do is reduce fluid... Dec 23 2013, 08:30 AM Jeff Hail
[quote name='Eric_Shea' post='1973906' date='Dec ... Dec 23 2013, 03:29 PM Eric_Shea I disagree. ;) Dec 23 2013, 02:22 PM Eric_Shea You boys have fun... I agree on the pressure aspec... Dec 23 2013, 04:27 PM DamonsCarrera Don't know what the argument is about. It see... Dec 25 2013, 03:25 PM DamonsCarrera Well, in case anybody is following this thread ...... Jan 24 2014, 09:39 PM Bob L.
So next on the agenda, after making a permanent ... Jan 25 2014, 04:29 PM 914_teener I would think your next move is..... if you want t... Jan 24 2014, 10:23 PM DamonsCarrera Yes, true. I set the valve according to the chart... Jan 25 2014, 10:10 AM stugray Which model tilton did you get? Did it fit easily ... Jan 25 2014, 11:20 AM DamonsCarrera @barefoot
I think Mark was referring to cracki... Jan 25 2014, 12:23 PM 914_teener I have re-read your posts and I have a few questio... Jan 25 2014, 02:54 PM DamonsCarrera @ 914 teener
The difference between a static valv... Jan 25 2014, 05:40 PM 914_teener Ok....so if it is static then the output will be l... Jan 25 2014, 06:05 PM DamonsCarrera @ 914 teener
I'm not sure how you mean to use... Jan 25 2014, 08:03 PM flypfi DamonsCarrera - I realize this is an old post, but... Nov 21 2016, 04:12 PM |
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