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How do i replace a piston seal on my front caliper, it`s a honda cb550 k3?

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Hi buddy easy task to do if you know what your doing 1st remove caliper and pads then using compressed air blow air into the caliper and the seal will pop out fast be carefull on this bit or you can do it with pliers and just grab the piston and twist it and pull it out once the piston is out you will see the seals the big one is the oil seal and the small one is the dust seal just get a screw driver and dig the back one out the oil seal and replace with the new one also it reccomended that you replace the dust seal at the same time there bugers to get back in took me an hour on my bike then clean it out inside and the piston and dab some oil on the seal before you put the piston back in this is to help it go back in use brake fluid and reinstall it all back together once all installed you need to bleed the caliper you can search on google for this buddy just type in how to bleed brakes on motorcycle get back to me if you want more info how do i replace a piston seal on my front - 0ed25f6.jpg

Posted on Sep 23, 2009


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There is no adjustment, but it sounds like the calipers need to be cleaned out. Remove the caliper and push the pistons out either with brake pressure from the master cylinder, or use air pressure from a compressor. If you use a compressor use a low pressure and keep your fingers out of the way. Once the pistons are out remove the seals from the caliper, and clean the area in the bore behind the seal, there will likely be some white crud behind the seal, and this holds pressure on the pistons. DO NOT USE any petroleum based cleaners on any brake system parts, it will cause the seals to swell and then they will be useless, use only denatured alcohol, or brake cleaner. After cleaning re assemble the caliper, wet all the parts with brake fluid to ease piston installation, reinstall on the bike and bleed the brakes, it should cure the problem.

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1985 gold wing my front break is stuck .... where do i start i have opened the bleeder and still seems to be stuck ....

Corrosion develops inside the caliper and causes the piston(s) to stick and fail to retract when the brake lever is released.
What you will need to do is remove and disassemble the calipers. Use compressed air to remove the pistons from the calipers by applying a carefully controlled amount of air pressure to the port where the brake line was attached (be careful to not let the piston become a projectile). Carefully pry the piston seals from the groove inside the caliper bore and clean everything thoroughly with hot soap and water (SimpleGreen works well). Clean all corrosion and other contaminants from the caliper and pistons, paying close attention to the groove where the piston seal goes. Use a dental instrument or similar tool to scrape all traces of corrosion from the groove (this is the key to success).
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All new brake shoes on 97 jeep front callibers still sticking

The problem lays with the Caliper itself and/or the brake hose connected to the Caliper.
However if you replaced the pads, did you also replace the Rotors or have them Turned? The old pads wear the rotor. New pads on old rotors that have not been replaced or turned may end with rubbing or stuck brakes.
A simple way to test whether it's one and/or the other:
1. Remove the Caliper from the rotor, remove the pads. Keep for now the caliper attached to the brake hose.
2. Very slowly push on the brake, exposing more of the piston out of the bore. Not all the way. Usually until the rubber dust seal/boot is fully extended.
3. Check the seal/boot for cracks and tears, and if clean or not. Bad seals may prevent the piston from re-seating.
4. Using a c-clamp and pushing straight in: Try repushing the Caliper Piston back into the Caliper Bore (the cup back into the hole). It should go back in realitively easy.
5. If it doesn't go back in easy: Again slowly pump the brake and re-push the pistons back out to full extended seal/boot (but not the piston out of the bore).
6. Detached the brake hose from the caliper.
7. Again using a c-clamp and pushing straight in: Try again to repush the caliper piston back into the bore without the hose attached. If it goes back-in relatively easy - the caliper is is the brake hose.
8. If the caliper piston does not go back in easily - Replace the caliper.
9. When Installing the new (reman) caliper, remember to bleed the brakes.
After the new Caliper is reattached to hose and has been bled:
10. Again push on the brake petal to fully extend the caliper piston fully (rubber seal/boot fully extended) Again do not push the piston out of the bore! Try pushing the piston back into the bore. If it does not re-seat relatively easy: Replace the brake hose.
11. Another method: After replacing the new caliper back on the rotor: Assumng the entire front end (2WD front wheel drive) or entire vehicle (2WD rear wheel drive) or (4WD all the time) is jacked up off the ground
a. Put the lug nuts back on the rotor.
b. Have helper Start the vehicle and place in Drive. Don't step on gas!
c. Have then let off the brake and then engage the brake.
d. When they let off the brake watch to see if the Rotor is turning or not, if rubbing or not. Or if still sticking.
e. With a new caliper, turned or new rotors, and still a problem? It is the brake hose!
12. Replace the brake hose and try again.

Another method but more expensive:
OR Replace the calipers, brake hoses; bleed and test!

If this helped or not; or if you need additional help or have addtional questions let me know on!

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1 Answer

How do i replace the front caliper seal on 06 malibu maxx??????

while the seals in the calipers are replaceable, its probably easier just to get a new/re manufactured caliper. if for any reason the seals don't work perfectly you could lose control of the vehicle when attempting to stop. with that said i'll try to explain the best i can how to replace the seals in the calipers for that vehicle.

1. jack up the front of the vehicle, place on jackstands and remove the front wheels, make sure the parking brake is on
2. unbolt the caliper and unbolt the brake line from the caliper and take caliper to a clean bench
3. remove the dust boot retaining ring on the caliper that holds the boot to the caliper itself
4. using a blowgun with a rubber tip apply low pressure compressed air where the brake line was bolted to the caliper to push the piston out of the bore (be carefull and ready because the piston may shoot out with some force)
5. when the piston comes out you will need to replace the dust boot and the seal so remove the boot and seal carefully so you don't scratch the piston ( the seal is actually in the caliper piston bore hole)and throw out the old seal and boot.
6. inspect all the surfaces and make sure there are no imperfections at all on the piston, the piston bore, or the caliper, if the surfaces are marred in anyway, replace the caliper, if they are good, using brake cleen and compressed air clean all parts then dry them
7. get the new seal and lubricate with DOT 3 brake fluid
8. install new seal into the caliper bore
9. apply a thin coat of DOT 3 brake fluid to the piston itself
10. install bottom half the the caliper piston into the caliper bore.
11. install new dust boot seal onto the piston
12. compress the piston to the bottom of the caliper bore
13. fully seat the dust boot seal into the caliper and install retaining ring
14. reinstall on vehicle (make sure to use a NEW copper washer on the brake line to caliper fitting) and bleed the braking system while checking for leaks.

repeat process for the other side.

if the caliper leaks at all from the piston after seal replacement, replace the caliper.

make sure you properly bleed the brakes before attempting to drive your car.

*these direction were extracted from personal experience and manufacturer information*

any other questions just ask!

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