Warped Discs?

yorksrsvr · Mar 16, 2009

I have had some pulsing on the lever on the front brake, only at really low speed and when coming to a complete stop I use the back as there is 100% a bit of a jerk , took delivery of my front paddock stand today and when I rotate the wheel there is a spot where it isn't as tight on the pads, the other 4/5's of a turn is constant. Can't see anything visable but is the disk warped or something else like stuck rivets...pads?

As always appreciate your wisdom being the mechanical newby :dowhat

r896neo · Mar 16, 2009

From you description you may be right but first job would be to take the wheel off and check your discs are floating properly. There should be some play between the disc and the carrier, There is a good post on it here,

http://www.rsvzone.com/forums/showthread.php?t=6058&highlight=floating+discs

Second give the caliper a good service. Both these are cheaper than a new set of discs.

yorksrsvr · Mar 16, 2009

just read that thread.. just ran out and checked, none of the bobbins really move, one or two wobble slightly ... guess this could be it ...wd40 with white spirit clean after coming up :devious

LEGS · Mar 16, 2009

Be carefull not to contaminate the pads with the WD40. You might want to try using brake cleaner first. You can spray this on quite liberally to remove the brake dust from the bobbins. Then just a minute squirt of WD40 to lubricate the bobbins until they rotate freely

yorksrsvr · Mar 16, 2009

I was just going to do the bobbins at the bottom, then really clean with white spirit before moving round... no brake cleaner to hand but I might wait till tomorrow

yorksrsvr · Mar 16, 2009

well all free now, some were fairly solid, sounds more even as it goes roud, going to try a felt tip now :biggrin

yorksrsvr · Mar 18, 2009

well its slightly better, but still not right, I'm assuming if you have one warped disc you need to replace bothto keep the braking even? ... I put the bike on the paddock stand and put a line on the disk with a board marker and one didn' touch the line the other scrubbed it out .. could it be a pad problem?

LEGS · Mar 18, 2009

Just double check that you've freed up all the bobbins. You should be able to rotate them easily with your thumb and forefinger, i.e thumb and forefinger either side of the disc. 9 times out of 10 it's the bobbins rather than the discs themselves

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Warped Discs?

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