Information and questions on GL1100 Goldwings (1980-1983)
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Post by bobbo52 » Sat Mar 05, 2011 10:29 am

Hello, i got a little problem with my rear caliper, one of the pistons is seized and will not come out. What can i do to get it out?

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Re: Help

Post by HALBUDD » Sat Mar 05, 2011 8:58 pm

I would spray it with some sort of penetrating oil then give it some lite taps with soft hammer or 2 by 4 not to hard if she does not break lose put a grease gun on it and pump it until she comes out. Note dont use compressed air and make sure that you put something between piston and body dont want it to go shooting across the room. Hal
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Re: Help

Post by 86GW1200 » Sat Mar 05, 2011 9:03 pm

I just did mine last week. I stuff a little rag between the puck and the caliper body and stomp/pull the brake pedal/lever. It usually sends them out in a hurry. You can always re-instal the one that came out and use a rag to wedge it in and the pressure may dislodge the "stuck" one.

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Re: Help

Post by thrasherg » Sat Mar 05, 2011 9:47 pm

I saw another technique that I have not seen before, someone purchased some of those expanding bolts (normally meant to be inserted in into a hole in a concrete wall. As you tighten the bolt up, the wedged end moves upwards and makes the metal sides move out (Expand). They put one of these bolts into the piston and tightened the bolt until it was a tight fit inside the piston, they then pulled on the bolt removing the piston with it.. Then simply loosened the bolt and the piston dropped off.. It seems like quite a simple way of getting a piston out if you have already disconnected the hydraulic lines.. Worth a go for $3 the cost of an expanding masonry bolt.


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Re: Help

Post by WingAdmin » Sat Mar 05, 2011 11:13 pm

Have a look at How to rebuild your rear brake caliper, starting at step 9. It's a simple solution, doesn't require any tools or force, and uses the caliper itself to drive the seized piston out. I've used this method many times, and it never fails.

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Re: Help

Post by RBGERSON » Sun Mar 06, 2011 8:57 am

The trick is to get them out or loose BEFORE you take the caliper off the bike..


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Re: Help

Post by bobbo52 » Sun Mar 06, 2011 10:16 am

Thanks for the responses. i am sure that i will get it out. Thanks again.

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Re: Help

Post by t2oldbikes » Mon Mar 07, 2011 11:09 am

I think if you used the technique on rebuilding that administrator posts you'll be fine. I would have saved the $40 for new pistons had I found this site earlier. If you have some stray sheet metal ( including duct metal or shim ) you can cut a few pieces to use as shim as you work them out. It will allow you to get them even, remove a piece at a time and move them out equally in the end.
As a shameless plug for myself, if you need a dual piston rear; I bought one as insurance that i need to sell but the pistons look like they need a good cleaning.

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