 Rear caliper pad vent adjustment, what is the magic? |
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| VaccaRabite |
 May 23 2026, 01:13 PM
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#1
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En Garde!  Group: Admin Posts: 13,874 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region 
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New rebuild calipers.
I have not yet bled the brakes. Inner rear adjustment went as I remember it going. Inner pads set at .005. I found a couple different specs for the adjustment so I just went with .005. Outer rear adjuster just spins. I can spin it as much as I want and the pad does not move closer to the rotor. This is for both rear calipers. So I suspect operator error. It’s been 15 years and I don’t remember the magic words. For late calipers do you not need to adjust the outer adjuster? Is it just the inner adjuster that needs to get set? HELP! Zach |
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| Shivers |
May 23 2026, 01:54 PM
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Senior Member Group: Members Posts: 3,414 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
Both should be adjusted. Outer adjuster- Remove the cap and the 13mm lock nut. Turn the 4mm hex screw counter-clockwise to retract the outer piston.Inner adjuster- Remove the steel cover. Turn the 4mm hex screw clockwise to retract the inner piston.
0.008 @VaccaRabite |
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| VaccaRabite |
May 23 2026, 02:04 PM
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#3
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En Garde! Group: Admin Posts: 13,874 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region
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QUOTE(Shivers @ May 23 2026, 03:54 PM)  Both should be adjusted. Outer adjuster- Remove the cap and the 13mm lock nut. Turn the 4mm hex screw counter-clockwise to retract the outer piston. @VaccaRabite Retracting isn’t an issue. The outer pad (and piston) is fully retracted. New pads when in with zero effort or issues. My issue is I can’t get the outer adjusters to now push the piston and pad back towards the rotor, on either side of the car. As for adjustment - I have seen everything from .002 to .008 inches. I picked .005. I think I saw PMB said .004. I suspect all of them will work just fine. I’m kinda wondering if I need to bleed the brakes and just stomp the pedal a few times to wake up the outer adjusters or if there is something else I missed. I can wait till Tuesday and just call PMB, but if I can figure it out this weekend all the better. I really should just know this, but the information leaked out of my brain at some point. Zach |
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| cgnj |
May 23 2026, 02:29 PM
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Senior Member Group: Members Posts: 724 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None
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I had a similar problem. recall watching PMB rear caliper rebuild. I put the caliper on the bench, applied pressure by hand on the non compliant piston and was able to get the adjustor to engage.
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| Ishley |
May 23 2026, 04:03 PM
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#5
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Member Group: Members Posts: 349 Joined: 4-October 21 From: Clarendon Hills Il Member No.: 25,957 Region Association: Upper MidWest
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You might need an inner adjuster gear. PMB sales them.
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