Rear brake caliper question - equal piston movement on both sides? |
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Rear brake caliper question - equal piston movement on both sides? |
Tdskip |
Jul 1 2020, 04:52 PM
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#1
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
First time looking at/working on these and have a couple questions if I may.
I hit the lines with compressed air and the pistons moved but the pistons on the same side as the hard line moved much further than the ones on the other side of the caliper. Shouldn’t they move the same amount so there’s equal pressure on both sides of the brake rotor? If I need to get the Pistons out just remove/cut away the rubber boots and put a thin block of wood in there and then hit them again with compressed air? Should the Pistons come all the way out or just out far enough where I can get them with some sort of vise grip? Thanks! |
bbrock |
Jul 1 2020, 05:30 PM
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#2
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
From the guru himself:
https://www.pmbperformance.com/brakehowto.html and https://www.pmbperformance.com/video.html |
Tdskip |
Jul 1 2020, 05:36 PM
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#3
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Thanks Brent, great links.
Any thoughts on how even the piston movement should be? |
bbrock |
Jul 1 2020, 05:52 PM
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#4
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I'm thinking that would be normal when using air because I doubt the pressure is as evenly distributed as with brake fluid. I know when I took mine apart, it was typical for one side to pop out with air while the other barely moved. Then I had to block off the other side to pop the second piston out. They shoot out like a bullet so follow Eric's instructions carefully.
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bbrock |
Jul 1 2020, 07:18 PM
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#5
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I wasn't paying attention and just caught you are dealing with the rear calipers. They are completely different due to the adjuster mechanism. Watching the video should clear things up on removing the pistons but they don't pop out with air like the fronts.
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Tdskip |
Jul 1 2020, 10:27 PM
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#6
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Thank you, appreciate the follow up.
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