 Rear Caliper Install Rotor Clearance Issue, 914-6 |
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| DennisV |
  Jun 24 2025, 08:11 PM
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#1
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Senior Member  Group: Members Posts: 670 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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I have newly restored calipers from PMB. They look great. Front went on no problem. The rear have been a real bear. I've tried both sides and I can't get reasonable clearance between the caliper (no pads) and rotor. I wonder if I have the alignment of parts wrong. (IMG:style_emoticons/default/confused24.gif)
My understanding, working from outside in, is: Trailing arm mount <- cover plate bracket <- caliper <- bolt Meaning the cover plate bracket is sandwiched between the caliper and trailing arm. Do I have that right? I tried the reverse as well and it still didn't line up well. (IMG:style_emoticons/default/blink.gif)  Not sure what I'm doing wrong... Damn you Ian Karr and your videos that make this look so easy. (IMG:style_emoticons/default/biggrin.gif) P.S. As you can see in the photo, the rotors are not vented so that should not be adding to any clearance issues. |
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| rgalla9146 |
Jun 24 2025, 08:34 PM
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#2
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Advanced Member Group: Members Posts: 4,773 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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Is the stub axle tightened in the wheel bearing /hub ? Is the rotor tight on the hub ? The order of the caliper mount looks right. |
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| DennisV |
Jun 24 2025, 09:26 PM
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#3
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Senior Member Group: Members Posts: 670 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(rgalla9146 @ Jun 24 2025, 07:34 PM)  Is the stub axle tightened in the wheel bearing /hub ? Is the rotor tight on the hub ? The order of the caliper mount looks right. Stub axles are not installed yet, so I literally have some wiggle room. The rotor is tight on the hub. 2 retaining screws installed. Both sides. |
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| porschetub |
Jun 24 2025, 11:25 PM
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#4
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Advanced Member Group: Members Posts: 4,877 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(DennisV @ Jun 25 2025, 03:26 PM) QUOTE(rgalla9146 @ Jun 24 2025, 07:34 PM) Is the stub axle tightened in the wheel bearing /hub ? Is the rotor tight on the hub ? The order of the caliper mount looks right. Stub axles are not installed yet, so I literally have some wiggle room. The rotor is tight on the hub. 2 retaining screws installed. Both sides. Your order is off on assembly and is real important ,you won't address your issue unless its all back together as things will change when final torque of the axle nut is completed..250ft/lbs if I remember right ,cheers . |
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| DennisV |
Jun 25 2025, 09:00 AM
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#5
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Senior Member Group: Members Posts: 670 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(porschetub @ Jun 24 2025, 10:25 PM) Your order is off on assembly and is real important ,you won't address your issue unless its all back together as things will change when final torque of the axle nut is completed..250ft/lbs if I remember right ,cheers . Hrmm. OK. I am blending topics a bit, but here goes. I stripped the car of engine, suspension, brakes, and fuel components. I did a post about order of assembly operations and the most popular path seemed to be installing the engine before stub axles for better clearance. So long story short, I left the stub axles off as I haven't installed the engine yet. So I have to do the engine and stub axles before I can complete the brakes? (IMG:style_emoticons/default/confused24.gif) I would have thought the rotor would wobble in the caliper, but not prevent it from being installed. The car is on jack stands. I had planned to drop it on its wheels once I get the brakes done. |
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| Superhawk996 |
Jun 25 2025, 07:49 PM
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#6
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914 Guru Group: Members Posts: 7,212 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(DennisV @ Jun 25 2025, 11:00 AM) The car is on jack stands. I had planned to drop it on its wheels once I get the brakes done. warning - if you put weight on those bearings without the stubs installed and torqued, you might as well order another set of bearings right now. Life of the bearings will be degraded just by putting weight on them without the stubs installed. The rear bearings are a split race, double row ball bearing. They are not designed to support load without having preload on the bearing (via the stub). Note: you can still install the axles after the stubs install and before the engine goes in. |
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Posts in this topic
DennisV Rear Caliper Install Rotor Clearance Issue Jun 24 2025, 08:11 PM
DennisV
warning - if you put weight on those bearings wit... Jun 25 2025, 10:30 PM davep
Stub axles are not installed yet, so I literally ... Jun 25 2025, 08:51 AM
sixnotfour what's the PN on rotor ?
Jun 24 2025, 08:35 PM DennisV
what's the PN on rotor ?
I ordered 901-352-4... Jun 24 2025, 09:24 PM mate914 Axle has to be installed.
Matt Jun 25 2025, 04:56 AM nditiz1 Does the axle need to be installed???
The bearing... Jun 25 2025, 06:14 AM Superhawk996 Warning. - do not roll the car around without thos... Jun 25 2025, 07:02 AM mepstein Like others said, torque the stub axles. It will m... Jun 25 2025, 09:19 AM davep Never roll the car without stub axles torqued down Jun 25 2025, 12:09 PM Superhawk996 Extra long socket with triple square or hex drive ... Jun 26 2025, 12:42 AM |
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