Warped rotors

[baffa]

Hey all, Ive owned an 07 fireblade for a couple of months now, and I bought it with the wavy rotors fitted.
Over the last few weeks ive noticed when coming to a halt at low speeds, there is a slight vibration or shimmy through the front of the bike, which feels like there is slightly warped rotors.
Is this a thing on bikes?
And does it involve skimming the discs and/or pads?

Brakes are still very effective, and it is only noticeable at low speeds. Expensive fix?

[caseye]

Check your Steering Head Bearings, no shit, they will give you exactly that feeling.

[mossy1200]

Check a brake piston isn't stuck as this will force the other side to bend the disc and it grabs.
Also check that the floater rivets are not seized up with brake dust etc

[Gremlin]

Check the rotor thicknesses as well. Potentially, you could have deposits on the rotors which could be rectified with some sanding.

Skimming them, with such low tolerances often doesn't work, or they're so thin that you need to replace them anyway.

Going through the same thing at the moment with discs that vary in thickness. Pain in the ass. First attempt at replacement discs didn't match what's needed... :rolleyes:

[Jay GTI]

Chasing my tail with an old Nissan Pulsar GTIR with Wilwood 4 pots on the front, which developed serious brake judder lead to an interesting discovery around "warped" disks.

Here's a good article to explain:

http://www.stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths

[F5 Dave]

Check your Steering Head Bearings, no shit, they will give you exactly that feeling.

Conversly warped discs left will knacker your steering head bearings.

if felt in the lever at higher speeds & its def discs warped. Some good advice above, service first. but you can tape a stick to your forkleg & see how close it gets to the disc when you spin the wheel while a mate holds it on the sidestand. Of course he will wobble & the stick will be move about.

Front stand & a secure mounting will make it obvious. Have used a vivid pen before to mark high spots. You probably won't notice a mm movement. Discs that float a bit are harder to check. Sometimes have to take callipers off & centralise those discs.

Dragging callipers will warp discs. If it gets hot with a test run & no application of brakes then you're in danger.

[actungbaby]

Hey all, Ive owned an 07 fireblade for a couple of months now, and I bought it with the wavy rotors fitted.
Over the last few weeks ive noticed when coming to a halt at low speeds, there is a slight vibration or shimmy through the front of the bike, which feels like there is slightly warped rotors.
Is this a thing on bikes?
And does it involve skimming the discs and/or pads?

Brakes are still very effective, and it is only noticeable at low speeds. Expensive fix?

How you liking the 07 fireblade i got 97 there nice well mines out action at moment

I had warped rotors on the vfr 750 mind you really bad u chould hear them .

with floating discs shoudint be as common ,of a problem

wonder taking the calibers of and giving them a clean around pistons chould be sight

sticking of one of them . being more presure on one side . grit on one the pads

its easy to do . just use detergent and old tooth brush .

[baffa]

Actung:

I sold my 97 Fireblade recently. Loved it, great bikes. Probably gonna regret getting rid of it.
07 feels smaller lighter and more chuckable, and much smoother. Id argue the 97 has much more character.

Anywho, its only at low speed, and I have my doubts it is the steering head, as there is no "notchyness" im aware of.

Plenty of meat on the rotors. it pulsed slightly when I was breaking hardish in the wet, as if there is a lumpy spot, so Im pretty sure its either warped a tiny bit or as someone said there are deposits on the rotors. I cant see any though.

Awaiting a front stand and a service, whichever arrives first will sort it.