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Piston sticking wont release the brake properly where can i get a new piston and seals

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If you drive a short distance and the wheel is locking up. You can release the pressure by opening up the bleeder valve on the wheel. This should allow you to drive back to your starting point before it locks up again. The problem in in the master cylinder on the handlebar. If you take off the cover. put a wad of lint free cloth in the reservoir to soak up fluid. Do not spill on paint or plastic parts, cover bike with plastic. You will see a large hole the fluid uses to feed the piston. Now look more closely and you will see a tiny pin hole that returns the fluid back to the reservoir. This is plugged . Clean this pin hole with a piece of wire ( one wire cut from a wire brush will do ). Fill and bleed the system and your problem should be solved. If the bike is old you should replace all the rubber seals in the master cylinder and wheel cylinder (You probably don't need them.)

Posted on May 16, 2010


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Piston sticking wont release the brake properly ,where can i get a new piston and seals

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Reassemble the calipers with new piston seals and use brake fluid to lubricate the pistons as they go in. Reinstall, top off the master cylinder with fresh brake fluid, and bleed the system. Your brakes will now function like new for the next decade or so.

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if pistons can be manually pushed back, then you may have **** in the brake line going to that caliper. a blockage will cause that. the piston seals may be damaged. they are square so when the piston goes out, the seal rocks forward but wants to pull the piston back when pressure is released.don't pull the caliper apart unless you know what your doing. and if you do then i don't need to explain the process.

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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!

Feb 20, 2009 | 2006 Chevrolet Malibu Maxx

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