My rear brake is dragging

[Guest]

I surrendered and ordered a piston kit (OEM) and a brake pad (also OEM). I will also get new brake lines from snell (braided steel) when I get the shipping number. No hurry.

 

[rphillips]

If you're riding and the brake is dragging, even a little, doesn't that cause very excessive heat at the rotor?

 

[Guest]

If you're riding and the brake is dragging, even a little, doesn't that cause very excessive heat at the rotor?

It gets warm, but not burn your hand hot. So not a big issue, i think. Not sure what I can try without psrts. But im sure they will be here in a week or two.

 

[Burque73]

It gets warm, but not burn your hand hot. So not a big issue, i think. Not sure what I can try without psrts. But im sure they will be here in a week or two.

Did you try this?

does this caliper use hard steel pins that the pad backing plates slide on?
If so NB these will rust and cause problems all by themselves. A quick clean with wet\dry sand paper to polish them smooth removes them as a source of trouble.

 

[Guest]

Did you try this?

I did not. But after washing my bike today they seemed better, so this makes sense, the pressure hose could have moved some rust around. I will try tomorrw.

 

[Burque73]

I did not. But after washing my bike today they seemed better, so this makes sense, the pressure hose could have moved some rust around. I will try tomorrw.

That would be really cool if it was something simple like that. I hope it is.

 

[rphillips]

Let me ask, is the brake dragging, or just rubbing? Disc brakes have no way to push the pads back away from the rotor.. The pressure is released & the pads still actually rub (touch) the rotors a little, not enough to try to slow the wheel, actually just touching the rotor. If yours aren't dragging enough to make the rotors pretty hot while riding, it can't be dragging very much, any pressure constantly pressing (dragging) the pad against the rotor should cause a lot of heat. Try put the bike on the center stand, prop it up to get the front wheel off the ground, squeeze the brakes, then release them. Then turn the front wheel, see if this rubbing is the same as you hear on the rear? Just something to try.

 

[Guest]

Let me ask, is the brake dragging, or just rubbing? Disc brakes have no way to push the pads back away from the rotor.. The pressure is released & the pads still actually rub (touch) the rotors a little, not enough to try to slow the wheel, actually just touching the rotor. If yours aren't dragging enough to make the rotors pretty hot while riding, it can't be dragging very much, any pressure constantly pressing (dragging) the pad against the rotor should cause a lot of heat. Try put the bike on the center stand, prop it up to get the front wheel off the ground, squeeze the brakes, then release them. Then turn the front wheel, see if this rubbing is the same as you hear on the rear? Just something to try.

You bring up some excellent points.

I don't believe it is opperating as it should, when on the centre stand the rear wheel won't spin freely. But the heat is not a lot (it gets a lot warmer from just a tiny bit of using the rear brake). There is two sounds, one is something hitting once every tire rotation, the other is like a scraping one.

I will try the centre stand thing, but Ill have to buy a 2x4 and stores are closed on monday (bank holiday), so it will be a bit. I will try to take the pads out and sand the metal clip things for rust tho.

 

[rphillips]

Dang, shouldn't need to buy anything. Use the jack from your car to just lift the front end, bike on center stand, raise the front wheel & roll a basketball under the front of the eng., Heck just a neighbor to sit on the rear seat, with bike on center stand, long enough to spin the front wheel