Back Brake

RhinoBiker · L Plate Warrior Joined: 21 Mar 2016 Karma :

Hi guys,
After not using my bike for a few months whilst at uni, I took it for a spin down my road today only to find that the back brake was sticking on once applied.

I took the brake apart and cleaned everything, paying particular attention to the pistons. I sprayed them with a healthy amount of WD40. Once the break was applied and released, everything seems to be fine with the piston coming out then going back in to the usual position. However once it's been applied a few times in quick succession, causing the piston to come far out, it's very hard to get back in again (I only managed to do it with the help of a big screwdriver and a lot of force!), but then sometimes it would go back in with relative ease.

Any of you have any idea what you think might help?

Cheers, Ry.

RhynoCZ · Super Spammer Joined: 09 Mar 2012 Karma :

bladeblaster · Trackday Trickster Joined: 19 Jan 2015 Karma :

new seals required.

Often when the dust seals perish they start to break up and get stuck down the side of the piston making the piston hard to move.

tom_e · Brolly Dolly Joined: 27 Feb 2016 Karma :

replace your seals and only ever put silicone or red rubber grease anywhere near your brakes as they're rubber safe.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

I'm guessing it's a Suzuki?

If so they have a habit of getting a build-up of crud in the bottom of the seal groove. I have made a tool for scraping the oxidisation out but one of those skinny brass wire wheels on a dremel would probably do a great job. Otherwise scrape them clean by hand.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy