Join Date: May 2011
Location: Orlando, Fl
Motorcycle: 05 gsxr 750 (track only)
Re: How To Clean Calipers and cure sticky pistons or brake rubbing
Just got done rebuilding/cleaning my front calipers... I like to make sure everything is right because my wheel was free spinning for way too long. I initially was just going to take the front rotors off, and de-glaze them.
When I had my left side caliper off with the right side one still on, I hit the brake lever a couple times just to see what the scoop was. The inside pistons of that caliper didn't move at all. So, I took them apart and broke them down.
A really easy way to get the pistons out is to blow about 30psi of compressed air into each housing. They pop right out. I cleaned the pistons real good (scotch brite), and the seals with soapy water. When I went to assemble them I made sure everything was spotless. I lubed everything up with some brake fluid, and pushed them in and out using compressed air to make sure everything was functioning that I could see.
Oh yeah, the right side caliper had some milky looking shit in both of the housings when I cracked them open. I've never seen that before. It didn't smell too good either. I had just flushed the entire brake system front and rear before my first track day a couple weeks ago.
I did note that going out on one session before I entered the track I went to hit my front brakes, and the lever came all the way back to my knuckles. Hmmmm.... Don't know what caused that, but I just adjusted the lever out to where it didn't hit and rode with it.
Now, I'm waiting on an adapter for my power bleeder. I have a might vac too, but its just so damn quick to flush an entire system with one of these units. Should be here wed, so I'll make good use of down time. I'll probably tackle servicing the forks while everything is off.
O, and its a T30 torx bit for breaking the calipers in half. It's a fairly easy task. Just take your time.