Severe Flexing of Rotor
bobmij7
Posts: 128
Hello!
I seem to be having an endless amount of problems with my f*^#ing front Hope Mono Mini. I have new pads, new rotor, fully bled, pistons running smoothly and the caliper seems to be in line (I have used the same number of 0.6mm spacers to line up my caliper. When i apply a fair amount of pressure to the front brake (e.g. endo) the rotor flexes (more on the lines of "bends") LOADS.
The top half of the rotor bends in, towards the wheel. This started today after i sprayed my bike with water to clean it. I haven't noticed the rotor bending before but this takes the p!ss.
Any Ideas? (apart from "visit you LBS which i probably will do!)
Thankies,
James
http://www.pinkbike.com/photo/1346326/
I seem to be having an endless amount of problems with my f*^#ing front Hope Mono Mini. I have new pads, new rotor, fully bled, pistons running smoothly and the caliper seems to be in line (I have used the same number of 0.6mm spacers to line up my caliper. When i apply a fair amount of pressure to the front brake (e.g. endo) the rotor flexes (more on the lines of "bends") LOADS.
The top half of the rotor bends in, towards the wheel. This started today after i sprayed my bike with water to clean it. I haven't noticed the rotor bending before but this takes the p!ss.
Any Ideas? (apart from "visit you LBS which i probably will do!)
Thankies,
James
http://www.pinkbike.com/photo/1346326/
0
Comments
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Probably too much spacers. does the rotor touch the pads when not touching the lever? In that case remove spacers, 'til it stops rubbing. number of spacers must be identical in both bolts.
WD-40? GT-85?? I'd rather use the old AK-47!0 -
I have a fair few spacers in but there are all in line and there is an identical number on both sides. The rotor DIDN'T touch the pads until it started to bend! I don't know why
http://www.pinkbike.com/photo/1346326/0 -
Is the caliper still centred on the rotor? Do both pistons retract fully?
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it is not neccasary to have the same number of washers on each bolt? sounds like you do need to get the mounts faced.
nick
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OK Nicklouse, just to confirm, I should try facing my fork mounts at my LBS, ye?
I'm not a pro, but, i can't imagine that as a result of not having my mounts faced the rotor would flex as much as it does.
I will emphasise that the rotor doesn't bend a little, it bends ALOT. (I wouldn't be suprised if it hit my spokes if i pulled hard on the lever). But, i may be wrong as i'm completely new to this problem!!
Thanks for the help!
http://www.pinkbike.com/photo/1346326/0 -
ok lets say the caliper is not aligned. apply brakes you get some braking power and little deflection. more force more deflection UNTILL a magic point where the disc is nolonger being deflected buy the pads but by the force from the braking operation ie from the wheel.now this could destroy the disc.
get your LBS to sort it.
nick
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OK. Yea that is what is happening by the looks of things. I'll see what my LBS have to say about things. It isnt the pads bending it. It IS the force of the wheel going round when the pads are pressed.
http://www.pinkbike.com/photo/1346326/0 -
but there has to be something to start it. if the rotor is flat and true and the caliper is correct then the disc can not distort.
nick
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true!! haha, this is beyond a joke. my guess is that it could just the the alignment which starts it then when the caliper clamps on the rotor the wheel just does the rest.
http://www.pinkbike.com/photo/1346326/0 -
Is there any way that the wheel could be miss-aligned? I can't imagine so as i have 66s with 20mm bolt through on a hope bulb but im kinda clutching at straws here.
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get it to a shop that can.
nick
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