Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> How to set brake rear pressure regulator preload?, I have two and they are set differently.
GeorgeKopf
post Jun 27 2025, 10:31 PM
Post #1


Member
**

Group: Members
Posts: 230
Joined: 9-February 21
From: Princeton, NJ
Member No.: 25,186
Region Association: MidAtlantic Region
Time to figure out my braking system. I have two old and crusty rear pressure regulators. I'm going to tear them down and refurbish one. I noticed that their adjuster screws are set at different depths.

Is there a way to determine proper preload?

Thanks.

George
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 9)
930cabman
post Jun 28 2025, 04:59 AM
Post #2


Advanced Member
****

Group: Members
Posts: 4,167
Joined: 12-November 20
From: Buffalo
Member No.: 24,877
Region Association: North East States
(IMG:style_emoticons/default/popcorn[1].gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Geezer914
post Jun 28 2025, 05:21 AM
Post #3


Geezer914
****

Group: Members
Posts: 2,003
Joined: 18-March 09
From: Salem, NJ
Member No.: 10,179
Region Association: North East States
Take note of how many threads are exposed so you can put it back together the same way . Better yet, send it to PMB for a rebuild.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Superhawk996
post Jun 28 2025, 10:50 AM
Post #4


914 Guru
*****

Group: Members
Posts: 7,197
Joined: 25-August 18
From: Woods of N. Idaho
Member No.: 22,428
Region Association: Galt's Gulch
QUOTE(Geezer914 @ Jun 28 2025, 07:21 AM) *

Better yet, send it to PMB for a rebuild.

(IMG:style_emoticons/default/agree.gif) Your life may depend on it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Jun 28 2025, 11:37 AM
Post #5


914-6 GT in waiting
***************

Group: Members
Posts: 19,952
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
The late Brent Brock / bbrock had a pretty comprehensive write up on his build thread.

http://www.914world.com/bbs2/index.php?sho...mp;hl=Regulator

“Just to close this out, I emailed PMB about setting the regulator or sending it in to have them do it. I got an email from the man himself saying that if I didn't have a gauge and hydraulic pump, I could just adjust the adjuster so it protrudes 10mm out of the spring housing as that's close to where they all seem to be set from the factory.

I'm going to take it to the local European car specialist that does most of the German car work around here and see it they can set it. If not, I'll just follow Eric's suggestion.”
User is online!Profile CardPM
Go to the top of the page
+Quote Post
GeorgeKopf
post Jun 28 2025, 11:29 PM
Post #6


Member
**

Group: Members
Posts: 230
Joined: 9-February 21
From: Princeton, NJ
Member No.: 25,186
Region Association: MidAtlantic Region
I measured both of my adjustment screws and one is 10mm and the other is 12mm.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
zulu33
post Jun 29 2025, 04:28 AM
Post #7


Newbie
*

Group: Members
Posts: 12
Joined: 24-May 15
From: Germany
Member No.: 18,755
Region Association: Germany
Attached Image Attached ImageAttached Image
George, this ist what the manual said.
Use only a good working or refurbished one.
If you use big brakes you will use different caliper sizes and won't need ist anyway.
cheeRS
Dirk
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
930cabman
post Jun 29 2025, 09:30 AM
Post #8


Advanced Member
****

Group: Members
Posts: 4,167
Joined: 12-November 20
From: Buffalo
Member No.: 24,877
Region Association: North East States
Achtung to you too
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Montreal914
post Jun 29 2025, 12:00 PM
Post #9


Senior Member
***

Group: Members
Posts: 1,854
Joined: 8-August 10
From: Claremont, CA
Member No.: 12,023
Region Association: Southern California
There is a thread with related information but no procedure though... (IMG:style_emoticons/default/dry.gif)
http://www.914world.com/bbs2/index.php?sho...225728&st=0

I find this graph on post #40 of interest for what the you are hoping to achieve. But as mentioneed, one would need a way to put pressure on the valve and meaure it with a gauge to dial in the graph numbers.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
930cabman
post Jun 29 2025, 03:49 PM
Post #10


Advanced Member
****

Group: Members
Posts: 4,167
Joined: 12-November 20
From: Buffalo
Member No.: 24,877
Region Association: North East States
Mine is 12MM, PMB is the right answer
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 1st July 2025 - 07:18 AM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...