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 )

3 Pages V < 1 2 3 >  
 Reply to this topicStart new topic
> 914 Rear Caliper Adjustment Procedure
914werke
post Apr 27 2009, 12:47 AM
Post #21


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,920
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest
Uh (IMG:style_emoticons/default/sad.gif) what if you find that turning your inner adjusters (w/gear in place)
provides no effect IE does not move the inner pad closer to the disc?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Apr 27 2009, 01:03 AM
Post #22


914 Wizard
**********

Group: Members
Posts: 10,633
Joined: 12-September 04
From: Life Elevated..planet UT.
Member No.: 2,744
Region Association: Rocky Mountains
Seriously you guys didnt get the inners adjusted ?
one or both ?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914werke
post Apr 27 2009, 01:18 PM
Post #23


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,920
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest
yup..brand new calipers. No workie on BOTH inside adjusters & yes it has adjustment gearz installed on both sides (now).
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Dec 14 2015, 02:29 PM
Post #24


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
Sorry Rich, only 6 years late on a reply but, I was looking for this for another customer and just saw this.

If we look at the first picture in this thread:

(IMG:http://www.914world.com/bbs2/uploads/post-1110-1228603821.jpg)

...you can see the basic relationship of what's in the "inboard" 1/2 of the caliper. When you spin the adjuster and nothing happens, this means the adjuster shaft is spun up "tight" inside the mechanism in the piston. When it is too tight, it's like a frozen fastener. In turning it, you will be turning the entire mechanism inside the piston shell. This happens if they've sat for a while. If the mechanism inside the shell is spinning, no adjusting will occur.

To remedy this, you'll need to overcome the lock by spinning the adjuster gear in a "clockwise" direction at very high speeds with little or no ramp up. This means an air wrench. By turning the gear clockwise, you will turn the adjuster counter-clockwise and with a few short bursts, the velocity and inertia of the adjuster should overcome the mass of the piston and mechanism and release itself.

I know we're 6 years late but, hopefully that will help others. (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomrev
post Dec 14 2015, 03:37 PM
Post #25


Member
**

Group: Members
Posts: 231
Joined: 25-February 14
From: N. Mich.
Member No.: 17,037
Region Association: None
I have to smile; in desperation, I used the same vice grip special, after scratching my head wondering how else to do it, back when I first had to do this. Necessity is a mother...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SKL1
post Dec 15 2015, 02:01 PM
Post #26


Senior Member
***

Group: Members
Posts: 1,637
Joined: 19-February 11
From: north Scottsdale
Member No.: 12,732
Region Association: Upper MidWest
Great right-up Eric. And good timing.

Even though I did adjust them after putting your new rear calipers on my '73, I'm going to check clearance again as I'm still having a hell of a time getting a firm pedal after NUMEROUS bleeding procedures.

Everything is basically new or rebuilt including your 19mm MC, and cleaned rear "proportioning valve" or whatever the correct name is. (IMG:style_emoticons/default/smile.gif)

Wonder if some of the horrible spongy brake is too much rear clearance. This is my next project!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MartyYeoman
post Apr 28 2016, 04:49 PM
Post #27


Senior Member
***

Group: Members
Posts: 1,526
Joined: 19-June 03
From: San Ramon, CA
Member No.: 839
Region Association: Northern California
QUOTE(Eric_Shea @ Dec 14 2015, 01:29 PM) *


To remedy this, you'll need to overcome the lock by spinning the adjuster gear in a "clockwise" direction at very high speeds with little or no ramp up. This means an air wrench. By turning the gear clockwise, you will turn the adjuster counter-clockwise and with a few short bursts, the velocity and inertia of the adjuster should overcome the mass of the piston and mechanism and release itself.


OK, Now, what's the technique for getting an outer adjuster unfrozen? Same idea except in a counterclockwise direction? I'm currently in a "need to know" situation.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Amphicar770
post May 17 2016, 08:18 PM
Post #28


Senior Member
***

Group: Members
Posts: 1,209
Joined: 20-April 10
From: PA, USA
Member No.: 11,639
Region Association: MidAtlantic Region
The how to restore / modify 914 book mentions removing the pin retainer before adjusting. Is that necessary? Thx.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post May 17 2016, 09:07 PM
Post #29


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
I like to leave them in. We're talking about the pad springs. The reason being; that's the way the car will be run. I tend not to use feeler gauges for the .004" though. It may be easier to use the feeler gauges if you remove the springs. I run a full rotation while adjusting the outer and the inner separately. I back the adjusters off just enough so there's no rubbing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Amphicar770
post May 19 2016, 09:13 PM
Post #30


Senior Member
***

Group: Members
Posts: 1,209
Joined: 20-April 10
From: PA, USA
Member No.: 11,639
Region Association: MidAtlantic Region
Hi Eric,

So, tonight I went to adjust the rears on the rebuilt calipers I received from you.

Both sides are missing the gear mechanism? Is this something I should have removed from the cores before returning them?

Thx.

Mike
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post May 20 2016, 08:32 AM
Post #31


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
Yes. Do you need a pair?

Attached File  Caliper_Installation.pdf ( 41.66k ) Number of downloads: 604
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Amphicar770
post May 20 2016, 08:53 AM
Post #32


Senior Member
***

Group: Members
Posts: 1,209
Joined: 20-April 10
From: PA, USA
Member No.: 11,639
Region Association: MidAtlantic Region
QUOTE(Eric_Shea @ May 20 2016, 10:32 AM) *

Yes. Do you need a pair?

Attached File  Caliper_Installation.pdf ( 41.66k ) Number of downloads: 604



My bad. Next time I should actually read the instructions. (IMG:style_emoticons/default/chair.gif)

Yes, I suppose I do need those. If you have, please PM me as to how I can get them from you.

Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Fatboy007
post May 23 2018, 09:04 AM
Post #33


Member
**

Group: Members
Posts: 62
Joined: 23-May 17
From: San Diego, ca.
Member No.: 21,124
Region Association: Southern California
Fantastic article thank you for the help!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Oct 2 2018, 08:57 AM
Post #34


Senior Member
***

Group: Members
Posts: 1,142
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
Dumb question probably. I need to adjust the hand brake. It's a factory six and as far as I know, it has the original calipers, beautifully restored by Eric a couple of years ago. Are they the same, and the procedure the same, as this DYI?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Oct 2 2018, 09:20 AM
Post #35


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

Group: Members
Posts: 19,592
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(jfort @ Oct 2 2018, 10:57 AM) *

Dumb question probably. I need to adjust the hand brake. It's a factory six and as far as I know, it has the original calipers, beautifully restored by Eric a couple of years ago. Are they the same, and the procedure the same, as this DYI?

yes. exactly the same.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Oct 2 2018, 09:44 AM
Post #36


Senior Member
***

Group: Members
Posts: 1,142
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
thanks, mepstein, for the quick reply. as the restored calipers were installed in 2015, I am hoping for no frozen parts and a quick/easy adjustment
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Oct 2 2018, 10:59 AM
Post #37


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

Group: Members
Posts: 19,592
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(jfort @ Oct 2 2018, 11:44 AM) *

thanks, mepstein, for the quick reply. as the restored calipers were installed in 2015, I am hoping for no frozen parts and a quick/easy adjustment

I'm 99% sure that all the ebrake hardware is the same as the 914-4 parts. Only the caliper castings, pistons and some seals are different. Maybe the bolts that hold the caliper halves are different but I'm not sure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914werke
post Nov 6 2020, 08:57 PM
Post #38


"I got blisters on me fingers"
**********

Group: Members
Posts: 10,920
Joined: 22-March 03
From: USofA
Member No.: 453
Region Association: Pacific Northwest
@Eric_Shea So every few yrs its seems I have to revisit this thread (IMG:style_emoticons/default/smile.gif)
Lets try this scenario:
Install new R. brakes new pads & set venting clearance.
Drive the car over a period of a .5 yr and at that interval need to adjust calipers due to wear (about .5 gone).
Go through process as described prior & continue driving.
Another 6 months of driving passes & its time for service including replacement of rear pads.
By this time the caliper pistons are extended well out of their bores.
Logically by reversing the direction of the adjuster's I should be able to retract the pistons into the calipers bores so I can fit the new pads with their increased/ original thickness
BUT instead the calipers DONT WANT TO RETURN?
Testing the adjuster action in the opposite direction seems to operate as intended (pushing OUT the piston further)
What am I missing?
Should not this process work for both inner & outer adjusters?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Nov 6 2020, 09:56 PM
Post #39


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

Group: Members
Posts: 19,592
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
I think you will have to manually push in the pistons as you screw in the adjuster.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Nov 7 2020, 07:54 AM
Post #40


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
Pressure may be needed to retract extended pistons when installing new pads. We always apply thumb pressure upon assembly when pulling pistons into the bore.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

3 Pages V < 1 2 3 >
Reply to this topicStart new topic
3 User(s) are reading this topic (3 Guests and 0 Anonymous Users)
0 Members:

 

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

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

- Lo-Fi Version Time is now: 22nd November 2024 - 12:26 PM
Invision Power Board v9.1.4 © 2024  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 ...