 rear brake adjuster not working! |
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| monkeyboy |
 Aug 26 2008, 01:14 PM
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#1
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Senior Member  Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None  |
I just installed a new set of PMB rear brake calipers, and pads. When I go to adjust the venting clearance, the passenger side, outside adjuster does nothing. I got the driver side adjusted just fine.
Can anyone help? I did search, and tried to use my air gun to get it back on track and didn't have any success. I do know that it needs to be turned counterclockwise, but if it was turned the wrong way, could it have come apart inside? Thanks |
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| davep |
Aug 26 2008, 01:29 PM
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#2
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914 Historian Group: Benefactors Posts: 5,225 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
Use of an air gun is almost guaranteed to cause trouble.
Yes, you can pop it apart inside, although that would be rare in this instance. I would try to get the piston moving by stepping on the brake. You may need to put in a thin brake pad, move the piston out a little, then force it back in. This is just to get the piston moving a little. Sometimes the internal mechanism will spin inside of the piston if there is less friction there than the piston sliding in the bore. This can happen more often when the mechanism is lubed during the install process. There is no lock as such between the mechanism and the piston, and what will move is the part with the least resistance. |
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| monkeyboy |
Aug 26 2008, 01:33 PM
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#3
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
Thanks, I will try that. I only used an air gun to pop it because I saw that suggested by Eric in another thread.
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| monkeyboy |
Aug 26 2008, 02:43 PM
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#4
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
Still spinning freely. Any other ideas?
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| Cap'n Krusty |
Aug 26 2008, 02:58 PM
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#5
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(davep @ Aug 26 2008, 12:29 PM)  Use of an air gun is almost guaranteed to cause trouble. Yes, you can pop it apart inside, although that would be rare in this instance. I would try to get the piston moving by stepping on the brake. You may need to put in a thin brake pad, move the piston out a little, then force it back in. This is just to get the piston moving a little. Sometimes the internal mechanism will spin inside of the piston if there is less friction there than the piston sliding in the bore. This can happen more often when the mechanism is lubed during the install process. There is no lock as such between the mechanism and the piston, and what will move is the part with the least resistance. Well, I don't think that's true .................. Inner and outer adjusters are linked to the pistons, and you MUST apply pressure on the piston as you turn the adjuster to retract it. You don't have to use pressure to move it out. Failure to push on the piston while retracting it can (and frequently does) cause the adjuster mechanism to become disengaged. That's not good. The Cap'n |
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| monkeyboy |
Aug 26 2008, 03:02 PM
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#6
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
QUOTE(Cap'n Krusty @ Aug 26 2008, 01:58 PM) QUOTE(davep @ Aug 26 2008, 12:29 PM) Use of an air gun is almost guaranteed to cause trouble. Yes, you can pop it apart inside, although that would be rare in this instance. I would try to get the piston moving by stepping on the brake. You may need to put in a thin brake pad, move the piston out a little, then force it back in. This is just to get the piston moving a little. Sometimes the internal mechanism will spin inside of the piston if there is less friction there than the piston sliding in the bore. This can happen more often when the mechanism is lubed during the install process. There is no lock as such between the mechanism and the piston, and what will move is the part with the least resistance. Well, I don't think that's true .................. Inner and outer adjusters are linked to the pistons, and you MUST apply pressure on the piston as you turn the adjuster to retract it. You don't have to use pressure to move it out. Failure to push on the piston while retracting it can (and frequently does) cause the adjuster mechanism to become disengaged. That's not good. The Cap'n If I turned it the wrong way when I first installed it, and it came disengaged, how would I reengage it? Do I have to take the whole caliper apart? |
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| Eric_Shea |
Aug 26 2008, 04:24 PM
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#7
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PMB Performance Group: Admin Posts: 19,289 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
If you turned it the wrong way the spring may have popped but, that's kinda rare.
The air method to release the piston can work if you go in the proper direction. You need to spin it counter clockwise fairly fast (short bursts). This will spin the adjuster faster than the mass of the internal piston can compensate for and get the piston moving. If you can't get it, send it back. I'll be back Friday and I can have it on the way back to you Saturday. |
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| monkeyboy |
Aug 26 2008, 04:29 PM
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#8
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
QUOTE(Eric_Shea @ Aug 26 2008, 03:24 PM) If you turned it the wrong way the spring may have popped but, that's kinda rare. The air method to release the piston can work if you go in the proper direction. You need to spin it counter clockwise fairly fast (short bursts). This will spin the adjuster faster than the mass of the internal piston can compensate for and get the piston moving. If you can't get it, send it back. I'll be back Friday and I can have it on the way back to you Saturday. I will give it another shot and let you know. Thanks for the help. |
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| monkeyboy |
Aug 26 2008, 07:24 PM
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#9
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
Couldn't get it to work, but I did get it in the mail. It's on it's way back.
Thanks. |
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| Eric_Shea |
Aug 26 2008, 08:26 PM
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#10
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PMB Performance Group: Admin Posts: 19,289 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Very sorry about that. It's hard to understand... everything goes in as planned/normal. (IMG:style_emoticons/default/confused24.gif)
You should see it back Monday/Tuesday. |
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| monkeyboy |
Aug 26 2008, 08:36 PM
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#11
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
Thanks. I have a few other things I can get done this weekend. No worries.
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