how to unseize a brake caliper piston


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how to unseize a brake caliper piston

Postby B-2 » Fri May 25, 2012 1:33 pm



Is there a easy way to unseize a brake caliper piston on a 1977 GL1000. It looks like it has sit for a very long time, & it is seized up pretty good. I have had very good luck finding all of the parts on E-Bay to rebuild everything, if I can just get the piston unseized from the caliper.
Thanks Bill


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Re: how to unseize a brake caliper piston

Postby virgilmobile » Fri May 25, 2012 2:00 pm

Some different ways.I found this works well and is messy to boot.
Open the reservoir.Get a bottle of fluid to keep it topped off.
Remove the caliper from the rotor and remove the pads.(single piston type)
Leave the caliper hang in a bucket and start pumping the brake.It will push the piston out.
If it's dual piston,hold a large screwdriver blade across the pistons.This will stop them just short of coming out till the second one can catch up.

Another method is less messy but also works...
refit the bleeder screw with a grease zerk and pump grease into the caliper.
I avoid using compressed air.It can send a piston into a breakable object....Please don't ask me how I know. :oops: My wife also likes to read these posts.
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Re: how to unseize a brake caliper piston

Postby B-2 » Fri May 25, 2012 2:06 pm

I will try the grease first because I have already taken every thing else apart. I am rebuilding the complete front forks to use on a VW Trike.
Thanks Bill
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Re: how to unseize a brake caliper piston

Postby shawnee1952 » Thu Jun 07, 2012 8:37 am

If you have already taken everything apart you will need to plug the supply line port in order to build pressure thru the grease zerk. Once you put the grease gun on you may have to adjust the tip to tighten it up on the zerk as it is hard to hand hold it when you start building pressure.
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Re: how to unseize a brake caliper piston

Postby rowejimf » Thu Jun 07, 2012 1:53 pm

I used an air pump (cigarette lighter powered). Attached a fitting to the end and (air mattress type). Blow air into fluid line attaches and be sure to point it at something soft like Virgil's sofa. They will shoot out with some speed.
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Re: how to unseize a brake caliper piston

Postby WingAdmin » Thu Jun 07, 2012 1:56 pm

rowejimf wrote:I used an air pump (cigarette lighter powered). Attached a fitting to the end and (air mattress type). Blow air into fluid line attaches and be sure to point it at something soft like Virgil's sofa. They will shoot out with some speed.


The first time I did my 1100's rear caliper, one of the pistons was so seized that 150psi of air pressure wouldn't even budge it. I ended up refilling it with brake fluid and using the brake pedal to push it out (while I had the other piston braced against a piece of steel).

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Re: how to unseize a brake caliper piston

Postby B-2 » Fri Jun 08, 2012 2:20 pm

Thanks guys
I think I am going to buy a kit for the master cylinder since I have to rebuild it any way, & use it to push out the caliper piston. The bike had sit for a very long time because there was almost no brake fluild in the whole system. I put some brake fluid in it to sit until I can order the parts I need. Has any one bought the new Apex Stainless Steel Brake Hose Lines, from rennsportautoparts ( Feedback Score Of 9432) on E-Bay. They sell custom lines for what ever you need, & since I am using 8" over tubes from Franks Forks, I will need longer hose's. Now that I think about it will I have to get a longer speedo cable, I did not get a cable with the front end when I bought it, so I do not know how long they are.
Thanks for all of the info guys BIll


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