Rear caliper

[imacwalker]

After my service, a few weeks back I've started to nottice my rear break caliper is making a clicking noise when coming off the break, the caliper seems to have a small amount of movement in it- is this normal?

[Fatbelly]

The caliper should be able to move in and out a little. It's called a floating caliper and it allows for brake disc or wheel running slightly off true.

The click might suggest a piston getting sticky - if that is the case it will need stripped & cleaned.

[Juvecu]

The caliper mounting is held in place by the rear axle and a slide mechanism. The mechanism has a rectangular metal block attached to the inside of the swingarm and matching grove on the caliper mounting bracket so it fits over the block. This allows the brake caliper mount (and the caliper mounted on it) to slide forward and backwards with the wheel so that it's always at the right place when you adjust the chain. There might be a very small amount of upward and downward movement on the mounting bracket because the of the way the sliding block mechanism works. You will also have a small amount of movement between the caliper and the actual mount bracket because the rear mounting bolt has a rubber sleeve. Additionally, your pads are not rigid mounted so they have a small forward and rear movement (probably less than a millimetre) as well as floating left and right to move with the disk. In the end all these add up and you might hear a soft clunk noise when you engage the brake or when you release it after stopping. This really isn't anything to worry about, but to be sure you can try to move the rear caliper with your hands (preferably when they bike is stood still   ) and if you find that the movement is excessive it should be checked out properly.