 Mismatched front calipers on 911 SC suspension swap – help identifying? |
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| Nana's_914 |
 Oct 3 2026, 07:09 PM
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#1
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Member  Group: Members Posts: 119 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.     |
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Replies(1 - 5)
| bdstone914 |
Oct 3 2026, 09:04 PM
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#2
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bdstone914 Group: Members Posts: 5,396 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
Oops
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| bdstone914 |
Oct 3 2026, 09:05 PM
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#3
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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. |
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| Nana's_914 |
Oct 3 2026, 09:34 PM
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#4
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Member Group: Members Posts: 119 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. |
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| Nana's_914 |
Oct 3 2026, 11:25 PM
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#5
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Member Group: Members Posts: 119 Joined: 27-October 06 From: San Diego, CA Member No.: 7,100 Region Association: Southern California |
Follow-up question: since I've already got one wide Carrera caliper, I'm thinking about going the other direction and converting the left side to match, then running 24 mm Carrera rotors on both sides.
Are the 24 mm Carrera rotors a straight bolt-on for my SC hubs, or do I need Carrera hubs? |
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| Luke M |
Oct 4 2026, 05:35 AM
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#6
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Senior Member Group: Members Posts: 1,608 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States 
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QUOTE(Nana's_914 @ Oct 3 2026, 10:25 PM) Follow-up question: since I've already got one wide Carrera caliper, I'm thinking about going the other direction and converting the left side to match, then running 24 mm Carrera rotors on both sides. Are the 24 mm Carrera rotors a straight bolt-on for my SC hubs, or do I need Carrera hubs? The 74 to 89 911 hubs are the same. Swap out the rotors and caliper with the Carrera stuff and your good to go. Attached image(s) 
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