Rear brake rotor

[Kilroy]

Hi All,
After a ride yesterday I came home and for some reason touched the rear brake rotor.  I was extremely hot to the touch.... So I guessing that the brake pads have been in contact with the rotor when they should not have been causing friction and heating it up.   My guess is that the pistons in the brake caliper are not functioning right, probably dirty and not retreating back after use.   My question is how and what do I use to clean the cylinders or pistons what ever they are called?  Thanks for your help.

Kilroy

[fstsix]

have you ever adjusted your brake pedal? did that and forgot to adjust back down the pedal when i put new pads on, that was a $350 case of dumba$$

[Rio Wil]

Are you real sure you didn't rest the toe of your boot on the brake pedal "accidentally".....its easy enough to do.....don't ask how I know....

[Ricky-D]

You need to keep an eye on what you found and determine if it's just your riding habit or something is actually wrong.

The rotor is a pretty big piece of steel and holds the heat pretty long so it could simply be the using of the brake in normal operation. Remember that heat is a byproduct of braking.

There is no adjustment available on the brake system hydraulics. "It is what it is"  There is no brake release mechanism with disc brakes so the pads touching the rotor at rest is normal. There will be a drag but nothing like it could stop the wheel from turning.

Keep an eye on it and don't panic. There is most likely, nothing wrong.

***

[hubcapsc]

There is no adjustment available on the brake system hydraulics. "It is what it is" 

***

You can adjust the flop out of it by messing with stuff inside of Box #10:



-Mike "I don't want the flop adjusted out of mine, so I don't mess with it  "

[Kilroy]

Thanks for the input guys.  The pads do rest on the rotor just like Ricky-D says.  I will keep an eye on it, just that the rotor was pretty hot.  I guess I should not be an idiot and touch it when I come back from a ride, don't know why I did it in the first place.
Kilroy

[Friagabi]

The adjustment is at #23, 34, and 16. Not in box #10. Besure that when the pedal is up there is just a little free play between #16 and the cup inside of the cylinder. If the pedal won't rise under spring return and give you that little free play the fluid may not return through the bleed hole and hold the pads against the rotor. The pedal should come fully up when you take your foot off it. If it is like mine was it may be sticking just before it returns to the travel stop. Kind of a pain to remove the pedal, springs and clean the piviot point and regrease it. But it did correct the hot disk problem.

[hubcapsc]

The adjustment is at #23, 34, and 16. Not in box #10.

Better check again 

Lubing the pivot point is a great idea...

-Mike

[Ricky-D]

Actually it is the brake pedal spring that is most important when returning the assembly to "rest" position.

Friagabi says it correctly where if the piston/cup assembly does not return completely there will be a tendency to "lock" the caliper thus holding the pads against the rotor.

The parts identified (23,24,16) are the adjustment for reasons of pedal position. Any free-play (flop/slop) you may have, is in the linkage part #23, the pin, part #36 and the hole where it attaches to the brake pedal which all are affected by wear, especially the pin part #23.

Lubricating the pedal pivot is crucially important to insure the pedal returns to the stop position.

C'mon, all you have to do is and look at the thing. it becomes clearly evident.

Jus sayin

***

[Madmike]

Thanks for the input guys.  The pads do rest on the rotor just like Ricky-D says.  I will keep an eye on it, just that the rotor was pretty hot.  I guess I should not be an idiot and touch it when I come back from a ride, don't know why I did it in the first place.
Kilroy

......... most "common sense" things become that after being subjected to a similar learning experience ........

[Friagabi]

10 is right, I was thinking 15.