One rotor much hotter than other 3 - cause of vibrations?

[speedyspaghetti]

Originally Posted by Gilles

+ 1..

Not sure about the vibration but pretty sure about the overheated rotor..

PS: If it has been sticking long enough, that particular pad will be 'thinner' but once I removed the piston and clean it (polished)
with steel wool and replaced the seals = no more sticking caliper

Fingers crossed...hopefully this is the issue. I'm probably due for new rotors anyway, so I'll probably replace the front rotors + pads, even if the caliper is the issue here.