 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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| 914_teener |
Jan 25 2014, 06:05 PM
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#2
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914 Guru Group: Members Posts: 5,266 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Ok....so if it is static then the output will be linear. Correct? The output is linear.
Doesn't the output on the valve want to be non-linear for driving on the street....meaning that in certain situations.....say a panic stop... you want a nonlinear output especially on the rears on a 914...otherwise the brakes would lock up...not good. That is what I would think as dynamic output. Varying in degree to input. * Dynamic valve regulates output pressure as a function of input pressure AND a measure of vehicle load or rate of acceleration. But.......the engineers weren't concerned about the load...they were concerned about the polar moment and the rears locking and losing control as Newtons laws started to do their thing. So if the valve you installed doesn't do the above...that could be a problem if you car is set up in a stock configuration. I would think? |
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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 GeorgeRud I wonder if an additional bleeder at the highest p... Dec 21 2013, 05:41 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 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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