[woogie11]

I know they're kinda older but I am rocking the 4 piston Shimano XT 755s (I think that's the number). I was wondering if anybody knows which 8 inch rotor is best to run on these brakes? I am currently running a Hayes V-8, I love the extra power and modulation but it rubs pretty good. This has nothing to do with shims or the pistons needing to be reset. Since they're older the LBS doesn't know and I don't want to spend another $40 on a bad idea. So if anybody knows the magic rotor or has some crafty advice I'd appreciate it. Woogie11 out...

 

[XSL_WiLL]

I know they're kinda older but I am rocking the 4 piston Shimano XT 755s (I think that's the number). I was wondering if anybody knows which 8 inch rotor is best to run on these brakes? I am currently running a Hayes V-8, I love the extra power and modulation but it rubs pretty good. This has nothing to do with shims or the pistons needing to be reset. Since they're older the LBS doesn't know and I don't want to spend another $40 on a bad idea. So if anybody knows the magic rotor or has some crafty advice I'd appreciate it. Woogie11 out...

The 4pots had a slight tolerance issue with the pistons and the bores, so the pistons never quite moved as freely as they should. Switching rotors won't stop the rubbing unless it's just that your rotor is real warped.

 

[Nick.]

Use Shimano rotors, which are still available in 6-bolt model.
If the brakes aren't retracting try removing the pads and cleaning the caliper assembly. I've run 755s for years on two bikes. If they're just rubbing take the time to get them properly aligned and you should be good.

 

[jvp108]

dont hate on the m755s, they are money. check your PMs for a solution to your problem.

 

[woogie11]

Hey Nick when you say "take the pads off and clean the caliper assembly" are you saying the pistonts themselves or what? Thanks

 

[XSL_WiLL]

Clean the pistons with isopropyl alcohol, and lube with mineral oil or caliper grease.

 

[Martin.au]

I switched to Hope 160mm floating rotors on my XT755 brakes. No rubbing at all under normal conditions and a very minimal rub after a long hot downhill. It's usually gone in 10 minutes too.