 914 Rear Caliper Adjustment Procedure |
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| 914werke |
 Nov 7 2020, 11:54 AM
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#41
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"I got blisters on me fingers"  Group: Members Posts: 10,027 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest 
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Ya no joy, is the process to then push them completely free, clean of any rust or crust & reinstall?
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| Van914 |
Nov 6 2023, 05:53 PM
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#42
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Van914 Group: Members Posts: 698 Joined: 5-January 03 From: Cincinnati, Ohio Member No.: 90 Region Association: Upper MidWest
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Rich,
Having the same problem today on a PMB rebuilt set. Used wood and pushed the brake pedal to move the pistons and lube the seals. Outside pushed back in the inner piston is stuck and won’t retract. Tried to open bleeder still no luck. What did you do to fix? |
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| davep |
Nov 6 2023, 06:37 PM
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#43
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914 Historian Group: Benefactors Posts: 5,137 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
You do realize that the rear pistons do not move freely like the front pistons?
The rears have the adjuster mechanisms, and the free axial movement is minimal. the adjusters HAVE to be used to move the pistons within the bores. |
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| PatMc |
Nov 6 2023, 08:11 PM
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#44
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Member Group: Members Posts: 119 Joined: 27-June 21 From: Long Beach Member No.: 25,669 Region Association: None
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QUOTE(Van914 @ Nov 6 2023, 06:53 PM)  Rich, Having the same problem today on a PMB rebuilt set. Used wood and pushed the brake pedal to move the pistons and lube the seals. Outside pushed back in the inner piston is stuck and won’t retract. Tried to open bleeder still no luck. What did you do to fix? Is this a freshly installed set of calipers? I'm unclear on what you're doing with a piece of wood. If fresh rebuilts, the pistons should be all the way retracted when they come out of the box...bolt them on the car and manually adjust them before putting any hydraulic pressure to them. The adjuster mechanism is retained in the pistons with a circlip. If you apply hydraulic pressure first it can push the pistons off of the adjuster mechanism, and then the mechanism will simply spin in the piston rather than move the piston when you spin the adjuster. If this happens, unbolt the caliper, open a bleeder, and use a C-clamp to try and squeeze the pistons back in...not too hard, just enough to pop them down over the adjuster machanism so the circlip snaps into place, then they should manually adjust like normal. |
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