Warped Rotor?
#1
01-07-2009, 02:46 PM
Join Date: Jun 2008
Location: Austin
Posts: 172
Warped Rotor?
The other day I had my bike up on the front and rear stands, and when i spun the front tire there was an awkward clicking noise as the tire made its rotation (im assuming it is the brake pads being in contact with the rotor). The tire would only complete one revolution before something "grabbed" though and brought its spin to a stop. Should a front tire be able to spin pretty freely once up on the stand? I don't feel any vibration or pull when I brake while riding, so if it's a warped rotor it must not be too bad yet....but it still doesn't seem normal. Any thoughts would be very helpful
#2
01-08-2009, 09:10 AM
Join Date: Feb 2006
Location: Roswell, NM
Posts: 5,432
hmmmm. Tire should spin freely. Have on all my bikes anyway. lol.....sounds like you might have to tear into her a bit and try to isolate the clicking/grabbing.
#4
01-08-2009, 10:00 AM
Pads do drag a little on the disc - they're pushed back a couple of thou further by the airflow at speed. Any warping in the disc and you'd feel it under braking. It's easy to measure the run out with a dial guage, or if you don't have one, improvise with a bit of stiff wire and a feeler guage. A couple of mm run out is acceptable - the service manual for your bike will give you the exact figure.
It's also worth checking that the caliper mounts are free and the caliper can slide (assuming the usual semi-floating calipers), and that the pistons themselves aren't sticking, but it sounds pretty normal to me..
Clicking noise sounds more like something in contact with the wheel or disk, such as a speedo or abs sensor.
Rob
It's also worth checking that the caliper mounts are free and the caliper can slide (assuming the usual semi-floating calipers), and that the pistons themselves aren't sticking, but it sounds pretty normal to me..
Clicking noise sounds more like something in contact with the wheel or disk, such as a speedo or abs sensor.
Rob
Last edited by williamr; 01-08-2009 at 10:03 AM.
#5
01-08-2009, 11:39 PM
A slight warp or drag from the pads and rotor will not normally make a person alarmed. You can tell on the stands if you have a wheel, rotor etc causing an issue.
#6
01-10-2009, 01:37 PM
Join Date: Jun 2008
Location: Austin
Posts: 172
Alright so I borrowed a run out gauge from work and I'm going to check the rotors this afternoon while I am rewiring my bike....someone actually buttspliced an entire 15 wire connector together one at a time, using whatever wires they could find, and then electrical taped over all of it so it looks like a pack of firecrackers. I'll re post and let yall know what I find with the gauge. Thanks again