Stuck Piston


Technical information and Q&A applicable to all years and models of Goldwings
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Hoosier Jack
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Location: Terre Haute, IN
Motorcycle: 1982 GL1100 Interstate

Stuck Piston

Postby Hoosier Jack » Tue Feb 10, 2015 3:12 am



I have an 82 1100 and the rear brake caliper has one stuck piston. I have tried to push it out with compressed air, even took it to the local dealer and a transmission shop to see if they could blast it out. Dealer suggested soaking in hot water and soap. Did that and filled it up with PB Blaster. Still stuck. I was able to push it in a bit. Is torching it the next step? Was not sure if I would still be able to use the caliper afterwards if I did that. I put in a thread in the for sale section for another one.



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Aussie81Interstate
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1981 GL1100 Interstate (sold)
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Re: Stuck Piston

Postby Aussie81Interstate » Tue Feb 10, 2015 5:17 am

Screw in to the bleed nipple a grease gun, put the banjo bolt into the caliper from the brake hose. Use a clamp of some sort to hold in the moving piston and pump away - the other piston will move - just keep pumping - a bit of penetrating oil down the sides of the piston won't hurt either. You only have to clean up the mess of grease- and clean up the rusty piston bore and piston then put in some new seals.

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roadwanderer2
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Motorcycle: 83 GL1100A aspencade, previously owned, 1981 honda GL500i silverwing interstate, 1974 yamaha xs400, 1974 Honda cb450 twin cam, 1983 honda vt30, 1982 honda 700 shadow, 1972 cb750four, and my first bike, a brand new 1982 honda CM400e. and a new to me 1986 GL1200 aspencade SEi
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Re: Stuck Piston

Postby roadwanderer2 » Tue Feb 10, 2015 7:14 am

hey Hoosier:

go onto eBay and type in the search box.....82 GL1100 rear brake caliper and you'll find a lot of listings for it.

stuart.

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WingAdmin
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Re: Stuck Piston

Postby WingAdmin » Tue Feb 10, 2015 12:57 pm

The grease gun idea is the best method. Grease guns can apply a tremendous amount of pressure. It will make a mess inside the caliper that will need to be cleaned out, but you were going to do that anyway, right? :)

kybigmac
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Re: Stuck Piston

Postby kybigmac » Tue Feb 10, 2015 1:20 pm

Use the grease gun ,I used this method on my xs650 Yamaha an it worked like a charm.

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Hoosier Jack
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Location: Terre Haute, IN
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Re: Stuck Piston

Postby Hoosier Jack » Tue Feb 10, 2015 1:32 pm

I have a small grease gun but it is not the same thread pattern as my caliper. Gotta figure that out first.

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WingAdmin
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Re: Stuck Piston

Postby WingAdmin » Tue Feb 10, 2015 3:25 pm

Hoosier Jack wrote:I have a small grease gun but it is not the same thread pattern as my caliper. Gotta figure that out first.


The grease gun should have a coupler on the end that locks onto the bleed nipple of the caliper:



You just push it onto the nipple and it clicks into place, then you can pump it (make sure the bleed nipple has been opened first!).

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roadwanderer2
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Motorcycle: 83 GL1100A aspencade, previously owned, 1981 honda GL500i silverwing interstate, 1974 yamaha xs400, 1974 Honda cb450 twin cam, 1983 honda vt30, 1982 honda 700 shadow, 1972 cb750four, and my first bike, a brand new 1982 honda CM400e. and a new to me 1986 GL1200 aspencade SEi
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Re: Stuck Piston

Postby roadwanderer2 » Tue Feb 10, 2015 4:08 pm

if you cant pump anything thru the bleeder screw, take the bleeder screw out, and with a torch tip cleaner, or a piece of piano wire, run it thru the top of the bleeder screw to make sure its clear and you can pump the grease thru it. if its clogged, there's a hole in the lower side of the bleeder screw, ( clean the dirt off and look for a round dot) that will have to be cleared. try to push the tip cleaner or piano wire thru it to unclog it. the tip cleaner or wire should go inside the bleeder screw about 1/8th of an inch if your trying to get it thru the side hole. above is pic of the bleeder screw and the hole at the lower side of it that you might have to clean out.

the pic might not be your exact bleeder screw, but all bleeder screws work the same way, they all have a small hole in the lower part of them and a lot of them get clogged, but most of them are cleanable. if you cant clean it out, replace it.

stuart.

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Mh434
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Re: Stuck Piston

Postby Mh434 » Tue Feb 10, 2015 7:45 pm

You could also try shrinking the piston with extreme cold - invert a can of "Dust Off" or similar, spray the liquid on the piston for 5-6 seconds, until it's uniformly frosted white (it will be something like -100 degrees by then). It will have shrunk several 1/1000's of an inch, and any of the above methods will pop it out. Unlike heat, the extreme cold won't hurt anything. Just don't a) shoot it across the room into something hard (don't want it to shatter), or b) hold onto it immediately, unless you're into extreme cold burns!

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roadwanderer2
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Joined: Thu Aug 08, 2013 4:03 am
Location: sweetwater, Tennessee
Motorcycle: 83 GL1100A aspencade, previously owned, 1981 honda GL500i silverwing interstate, 1974 yamaha xs400, 1974 Honda cb450 twin cam, 1983 honda vt30, 1982 honda 700 shadow, 1972 cb750four, and my first bike, a brand new 1982 honda CM400e. and a new to me 1986 GL1200 aspencade SEi
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Re: Stuck Piston

Postby roadwanderer2 » Tue Feb 10, 2015 8:19 pm

oh definitely do NOT hold onto it, you could wind up with, (and this is no joke), frostbite, and if its bad enough, you could loose a finger and thumb tip if you grab it while its still frozen. think on the lines of cryogenics or dry ice but much colder. be very careful how and where your spraying that stuff. wear safety goggles and thick rubber gloves.

stuart.




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