 Brake Caliper Piston Won't Compress |
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| DennisV |
  Aug 31 2025, 12:13 PM
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#1
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Senior Member  Group: Members Posts: 697 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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I have newly refurbished brake calipers that I am trying to install for the first time. New rotors and pads too. One of the 8 pistons will not compress sufficiently to allow me to the install the brake pad on that side. I have:
* Swapped brake pads * Removed the caliper from the car worked on it on the bench * Attempted to compress the piston with quick-action clamp * Backed off the adjustment screw I will of course call the vendor, but that puts me two days behind. I'm hoping for something obvious that I'm missing... Original 914-6 calipers if it matters. Thanks.  |
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| Superhawk996 |
Aug 31 2025, 12:28 PM
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#2
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914 Guru Group: Members Posts: 7,349 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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The adjuster should pull the piston in.
I’m going to attach the PMB video just so you have clarity on what the internals are https://www.youtube.com/watch?v=dm_DnizKOZM?si=Ku4c6ZRuVEYbtXHu There is an outside chance the adjuster mechanism wasn’t full seated into the piston. If you’re convinced the adjuster is backed all the way out and no longer pulling the piston in, you might want to be a little more aggressive with the clamp and see if you can push the piston back the rest of the way. See time stamp 27:00 or so to see what I’m talking about. |
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| DennisV |
Sep 1 2025, 07:42 PM
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#3
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Senior Member Group: Members Posts: 697 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(Superhawk996 @ Aug 31 2025, 11:28 AM)  The adjuster should pull the piston in. I’m going to attach the PMB video just so you have clarity on what the internals are This video was very helpful. Thanks for the pointer. In short, I was a bonehead. I missed the part in the workshop manual about the cap for the adjuster. I was using the hex to turn the cap. Not the adjuster underneath. The adjusters weren't even installed for the inside rear. (IMG:style_emoticons/default/headbang.gif) Lesson learned, and we got the calipers and pads on today. Brakes bled too. She's a roller again! (IMG:style_emoticons/default/smilie_pokal.gif) |
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| fixer34 |
Sep 1 2025, 08:10 PM
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#4
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Senior Member Group: Members Posts: 1,330 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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QUOTE(Superhawk996 @ Aug 31 2025, 01:28 PM) The adjuster should pull the piston in. I’m going to attach the PMB video just so you have clarity on what the internals are https://www.youtube.com/watch?v=dm_DnizKOZM?si=Ku4c6ZRuVEYbtXHu There is an outside chance the adjuster mechanism wasn’t full seated into the piston. If you’re convinced the adjuster is backed all the way out and no longer pulling the piston in, you might want to be a little more aggressive with the clamp and see if you can push the piston back the rest of the way. See time stamp 27:00 or so to see what I’m talking about. Actually, I don't think the adjuster retracts the piston, it is one-way only. |
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