traaidmark Posted February 4, 2011 Posted February 4, 2011 Hey guys, Since I got my new bike I hear a very distinct *plink plink* sounds coming from my front wheel, and a strange scraping from my brakes (disc), but only after heavy braking. I have taken it in several times, but they can never reproduce the issue. The sound stays even after braking for quite a while. Yesterday went riding again, and on one corner after a steep downhill i had to brake quite hard and all of a sudden the noises came back, but when i let go of the brakes my bike went into quite a hectic speedwhobble. even after i slowed down (nogals geskrik) and picked up again on the straight if i let go of some pressure on my bars and lean forward the bike goes back into a whobble. The plink sounds like my spokes, and the brake rub is obviously the brake, but what's wrong? Everything seems to be tightened and in place. Now that I am keeping an eye on it the bike does feel a bit unbalanced.
traaidmark Posted February 4, 2011 Author Posted February 4, 2011 Also, the wheel does look true. It doesn't wobble about if you look straight down while spinning.
Mojoman Posted February 4, 2011 Posted February 4, 2011 Is there any movement on the wheel? Prehaps your bearings?
traaidmark Posted February 4, 2011 Author Posted February 4, 2011 Hmm it feels solid enough, but lemme go checck that when i get home.
KiNgL Posted February 4, 2011 Posted February 4, 2011 (edited) Warped Disc Maybe?Ditto , the plink plink may be gravel,debris, dust etc collecting in the caliper and then on every rotation you hear it intermittently , maybe the caliper pistons are not releasing all the way back and hence the wobble feel ?Just a theory ... Take front brake off ride without it braking is for sissies anyway , Na kidding i wouldnt mess around with it mate could cease or fail at a critical point . what components ? , bike etc were you riding heavy mud at some point ? I assume a warped disc could have happened if there was a lot of heat build up then a instant cooling down like water or such... happens on road cars dont see why it couldnt happen to a bike disk ? Edited February 4, 2011 by KiNgL
MattyG Posted February 5, 2011 Posted February 5, 2011 i had same problem the disk is rubbing on the edge of the caliper mount..just loosten your caliper(the 2 bolts on the fork bracket) then re allign the calipers so it doesnt hit the rotor..try that.. it worked for me
ichnusa Posted February 6, 2011 Posted February 6, 2011 check your computer magnet... and then the discs
Black Widdow Posted February 6, 2011 Posted February 6, 2011 Yip, wobbly disc. The disc might just touch the caliper normal, but after hard braking it heats up and the effect doubles for a while after because of heat expansion (the disc). This would be because of not true wheels, being spokes or bearing.
traaidmark Posted February 7, 2011 Author Posted February 7, 2011 Thanks guys. I will just take it into the lbs to fix up. It's getting worse, now when i just brake normally the entire fork shudders quite badly.
DirtyFrank Posted February 7, 2011 Posted February 7, 2011 Sounds like your steering head bearings. Either loose or worn.
traaidmark Posted February 7, 2011 Author Posted February 7, 2011 Dunno, I am not a technical person, but the headset feels okay. Will update you when I know for sure!
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