 Mismatched front calipers on 911 SC suspension swap – help identifying? |
|
|
|
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. |
|
|
  |
| Nana's_914 |
 Oct 3 2026, 07:09 PM
Post
#1
|
|
Member  Group: Members Posts: 118 Joined: 27-October 06 From: San Diego, CA Member No.: 7,100 Region Association: Southern California  |
My 914 has front suspension swapped over from a donor '78 911 SC. The left front caliper recently started dragging hard, and when I pulled things apart I noticed the two front calipers don't match.
They share the same bolt pattern, pad size, and hose connections, but the castings are numbered differently. On closer inspection the center spacing (the gap between the halves) is also different, and the right caliper seems too wide for its rotor. Right side: ATE, halves stamped 25G and 26G, center spacer about 11 mm Left side (the one dragging): one half stamped ATE 281, the other half unmarked, with squared-off edges instead of the smoother blended shape of the other castings, center spacer about 7 mm Both rotors measure about 20 mm thick. Can anyone help me identify what I have, and which one (if either) is correct for this setup? Photos attached.     |
   |
 
|
| bdstone914 |
Oct 3 2026, 09:04 PM
Post
#2
|
|
bdstone914 Group: Members Posts: 5,396 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
Oops
|
|
|
|
| bdstone914 |
Oct 3 2026, 09:05 PM
Post
#3
|
|
bdstone914 Group: Members Posts: 5,396 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
You have one early A caliper and one later A style calpier. The caliper with the 11mm spacer is meant to be used with a 24mm rotor.
It works but rhe pistons start by sticking out 2mm more. To change it to match you would need a pair of spacers and shorter bolts. |
|
|
|
| Nana's_914 |
Oct 3 2026, 09:34 PM
Post
#4
|
|
Member Group: Members Posts: 118 Joined: 27-October 06 From: San Diego, CA Member No.: 7,100 Region Association: Southern California |
QUOTE(bdstone914 @ Oct 3 2026, 11:05 PM)  You have one early A caliper and one later A style caliper. The caliper with the 11mm spacer is meant to be used with a 24mm rotor. It works but the pistons start by sticking out 2mm more. To change it to match you would need a pair of spacers and shorter bolts. Thanks! Sounds pretty straight forward. |
|
|
|
|
4 User(s) are reading this topic (4 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 3rd October 2026 - 09:47 PM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.