 how much force to push pistons back into calipers, trying to free up sticky brakes |
|
|
|
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. |
|
|
  |
| swl |
 Aug 8 2010, 02:42 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada  |
DaveP is doing me a new set of front calipers but while I'm waiting I'm trying to free up the front right. It was dragging pretty hard and was the only thing that the car failed on its safety check. If I can get that caliper freed up I can start (IMG:style_emoticons/default/driving.gif)
I followed the haynes instructions for freeing up a stuck caliper. Took out the pads. Put in some wood shims. Applied the brakes until they moved. Felt a little pop as the first side moved. Then a pump or two later the second side moved. So far so good. Now I'm trying to lever the pistons back in but they won't budge. How much force should that take? I feel like I'm putting way more pressure on it than it should need. Starting to wonder if I might have a swollen softline. |
   |
 
|
| ejm |
Aug 8 2010, 03:23 PM
Post
#2
|
|
I can see the light at the end of the tunnel Group: Members Posts: 2,692 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
Open the bleeder and see if you can push the piston back. You are correct about a bad hose causing the original problem.
|
 |
|
| tomeric914 |
Aug 8 2010, 06:05 PM
Post
#3
|
|
One Lap of America in a 914! Group: Members Posts: 1,259 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States 
|
You didn't mention in your post, what kind of condition you found the pistons and cylinder bores in? The pistons usually clean up pretty easily with some 600 grit paper. The bores you hopefully honed.
If your calipers have knockbacks in them, they will take some force to put back together. |
|
|
|
| realred914 |
Aug 9 2010, 08:14 AM
Post
#4
|
|
Senior Member Group: Retired Members Posts: 1,086 Joined: 1-April 10 From: california Member No.: 11,541 Region Association: None |
yup open the bleeder and see if that helps, if it does, then I would suspect your rubber hoses maybe restricted or the master check valve is stuck closed. the pistons should go back in freely (I am assuming they were still retianed in the caliper and that teh caliper is still mounted to the car with rotor.
if the pistons are al rusty, then it sohould all come apart good luck |
|
|
|
| swl |
Sep 3 2010, 05:31 PM
Post
#5
|
|
Senior Member Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada |
sorry it took so long to close the loop. It was the caliper - new ones work great. Thanks DaveP!
The "open the bleeder" bit was brilliant. Kinda smacked myself for not thinking of it. |
|
|
|
| davep |
Sep 3 2010, 07:33 PM
Post
#6
|
|
914 Historian Group: Benefactors Posts: 5,148 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
Now get out there and DRIVE!
|
|
|
|
| swl |
Sep 4 2010, 05:35 AM
Post
#7
|
|
Senior Member Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada |
QUOTE(davep @ Sep 3 2010, 05:33 PM)  Now get out there and DRIVE! Took it back for reinspection and now the tie rods ends failed (IMG:style_emoticons/default/headbang.gif) Going to get a set of turbos and do it right. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 23rd May 2024 - 06:03 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.