slacker83
Novice Class
Posts: 50
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posted August 30, 2010 07:35 AM
So brake problems after drop
Well on wenesday I dropped the bike leaving my garage, just a small drop in the grass no damage to the bike so I thought. I didn't realize I put my foot in a hole and couldn't catch the bike fast enough to keep it up. The frame slider seemed to take all the damage but on saturday when I went to take the bike out my front brakes were not acting normal at all. When I hit the front brakes I get a terrible shimmy and bad squealing noise, I have taken the pads out (only 600 miles on the new pads) and one side looked very very dark compared to the others. I'm not sure if grease or something else got on them from the drop, or worse case I bent the fork leg when the bike landed on the right side. Has any one experianced anything like this?
Thanks,
Steve
  
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Shane661
Needs a life
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posted August 30, 2010 07:37 AM
Sounds like you may have bent a rotor. They bend very easily.
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slacker83
Novice Class
Posts: 50
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posted August 30, 2010 07:45 AM
Is the best way to check for a bent rotor just to take a caliper to it in many different places. I've never checked for a bent one on a bike before. Also any suggestions for replacements.
Thanks,
Steve
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Shane661
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posted August 30, 2010 07:57 AM
A lot of times you can just check it while on a front stand. Rotate the wheel and look for runout on the rotor.
Otherwise, you can remove the wheel and check it for runout on a balancing stand or similar.
The stock rotors are good parts, and there are many excellent aftermarket parts as well. Galfer and EBC come to mind.
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Hellmutt
Needs a job
Posts: 2013
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posted August 30, 2010 10:56 AM
 Edited By: Hellmutt on 30 Aug 2010 18:57
Are both rotors/calipers like this?? Wonder if your forks twisted in the clamps and bound the rotors in both calipers a bit?? Or is that even possible?
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British flying couch with endtables and an orange thumper
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dubious
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Needs more time to ride!
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posted August 30, 2010 11:09 AM
Check rotor runnout as Shane discribed.
yes, you can twist them lower fork tubes and axle assembly in a down. I have seen this numerous times on dirtbikes after a good fall.
Back off the axle nut so the axle can turn but doesn't havemore than 1mm end play, then loosen the axle pinch bolts and pump the forks with the brakes applied, pump the forks a dozen times, ypou can even do this with the bike in gear, using its own power and momentum to realign everything.
The dirt bike crowd has been aligning forks and axles like this upon assembly , to prevent fork friction forever.
Then tork the axle pinch bolts, torque the axle nut, then torque the axle nut (collar)pinch bolts.
If you still have issues, then you will need to inspect further for axle and fork distortion/ damage
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Hellmutt
Needs a job
Posts: 2013
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posted August 30, 2010 11:30 AM
What I thought, bound my CR up a few times slayin' the woods -- but those are easy to re-adjust!! Stand in front of her and bang the wheel between your knees until they're straight again - haha 
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British flying couch with endtables and an orange thumper
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted August 30, 2010 11:33 AM
also, check to ensure the master cylinder is not sticking partially, or damaged.
Sometimes air in the system, or a master cylinder set up too close to application will cause the pads to drag when the fluid warms and expands, causing the brakes to drag, which will overheat and can also cause the symptoms you discribe.
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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slacker83
Novice Class
Posts: 50
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posted August 31, 2010 10:05 AM
Thanks for the input guys, I didn't even think about the the forks getting twisted but that actually makes a lot of sense. The brakes only seem to make the noise when the brakes are applied so I think the master cylinder is ok but I will check the brakes also by bleeding them. Thanks everyone for the help, this bike has been killing me in repairs this last 1k miles. Valve cover gasket, brake pads, exhaust manifold gaskets. All in the last month or so. Been thinking about buying a second bike just for when I'm fixing this one maybe a tuono 
Steve
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