| Author | Message | ||
     Oldbmw1 |
I have a 2009 xb12xp with 6k miles on it. I recently noticed my rear rotor is way to hot. Can't touch it even after a short ride. The front brake rotor does not get as hot and has normal temp when touched. I have never lost my rear brakes due to brake fluid getting too hot. Is this normal for a uly? If not, normally this means a dragging brake caliper caused by a frozen caliper piston, warped or bent rotor, or a blockage of the tiny "bleed back" hole in master cylinder causing the brake piston in caliper to not release when brake lever is not engaged by rider. But none of the these problems are exhibited on my bike. I have a warranty and could take it into the dealer but would rather fix it myself and know its done correctly. Thanks for any thoughts on the matter. | ||
| Panhead_dan |
I would bleed the system and see if that cures it. I would also work the pads out from the rotor and pump them up to observe caliper function. | ||
| Etennuly |
If you are comparing the rear to the front rotor it is oranges and apples. Part of that large diameter rotor's genus is it's ability to cool rapidly. Is the rear rotor turning blue from heat? Are there grooves forming from the pads rubbing? Does it get hot enough to smoke? If you jack up the bike then turn the wheel by hand, does the brake drag? Determining a rotor's heat with a bare hand is not going to be very relevant. A car rotor will get to where you cannot touch it without even using the brakes on most cars. I have found that the rear hub of the rim actually gets quite hot under normal running conditions. I would think that if you elevate the rear tire and are able to turn it with ease, but hear the brake drag a bit, it would be normal. If you feel turning resistance it would not be so. The slider pins have rubber boots on them. This is an easy caliper to take of to clean. Make sure to clean the outside of the pistons before pushing them back into their bores. | ||
| Jphish |
Had that problem too. While what Etennuly sez is true - heat is relative. There is hot & damn hot. As mentioned, clean the caliper pins, then - dont forget to lightly LUBE them with silicone. Floating calipers dont like being "stuck". | ||
| Natexlh1000 |
One other "gotcha" that I fell victim to on occasion with my X1: Make sure your brake pedal goes all the way back when it's not being pushed. If the master cylinder is pushed even a tiny amount, the bleedback hole will be covered and the fluid will be trapped in the line and caliper. | ||
| Oldbmw1 |
Update: I rode to work this morning and did a test. I rode without ever using the rear brake. Then check for heat. It was barely warm so I'm guessing this hotter than what I'm normally seeing in rear rotors is normal for this bike. Thanks for the input. | ||
| Skifastbadly |
Wait. There's a rear brake? | ||
| Teeps |
Skifastbadly Posted on Friday, September 07, 2012 Wait. There's a rear brake? Yes, it's used for trail braking while cornering, under some conditions. | ||
| Uly_man |
"Yes, it's used for trail braking while cornering, under some conditions." Use it to "scrub off" speed in a corner if you are going to fast. Slamming on the front will unbalance the bike and may cause it to "stand up" which is very dangerous. Press your front/rear levers and you should see the pads move and lift off the disc. If they do not lift off the disc they need looking at. | ||
| Rdkingryder |
Don't suppose your actually resting your right foot on the brake pedal? You know, like an old man and his Buick?  | ||
| Oldbmw1 |
No. I have been conscious of where my right foot rests ad keep it near but not touching brake peddle but a good thought on the matter. "It takes a village...." I think the hot rear rotor is just normal for this bike. | ||
| Uly_man |
Yes the thing to remember is that it is a "floating" caliper. A system long since dumped on the front brakes. The pins bind causing wear on one pad. Sometimes it will even warp a disc as one side gets hotter than the other. | ||
| Ourdee |
Rear brake is used for holding the bike at a light on a slope. | ||
| Oldbmw1 |
Coming off my last bike, a Ducati Multistrada, I used the rear brake for more than that! And flogging this uly in the twisties is not that far off the mark compared to my multi 1000ds. I shift less and am on the throttle longer. Rear brake is the only sub par component that can be remedied I'm told with better brake pads. | ||
| Thumper1203 |
The stock exhaust tip flow direction was roasting the rotor/hub/pads on my 06' uly, mostly on longer warm weather rides.. installed a drummer.. fixed |
