Join Date: Jan 2019
Location: Coromandel, New Zealand
A thumbs-up for DaveNZ (brakes)
I’ve read several posts about warped disks and/or “pulsing of the brakes” and mentally filed it away in case it ever applied to my bike.
A few weeks ago, I noticed that whilst slowing from low speeds (e.g, approaching a T junction), my front brake seemed to slightly grab, release and grab again under light pressure on the lever. Although spinning the front wheel didn’t reveal any rotor warping or runout to the naked eye, it was still a bit worrying.
However, I tend to be very light on brakes and my cornering style is a combination of observing the vanishing point and using throttle and gearbox accordingly. Looking at the front rotor faces, they appeared glazed and I wondered whether my light use of brakes had contributed to this. I mentioned this in a recent post and DaveNZ recounted past experience on his Multistrada and how he addressed the problem.
Yesterday, I followed Dave’s advice and used 400 wet and dry paper (wet) on a block to remove the glaze on both sides of each rotor then washed them thoroughly. Also removed the pads and lightly sanded them in a figure of 8 pattern on a flat plate, then sprayed them with brake cleaner.
Went out today to a straight(ish) side road and repeatedly did high speed stops to build up rotor temperature. Back to the village and no more low speed judder! Dave, you’re a star mate – thanks so much for the tip.
If anyone else suffers from these symptoms, it might just be worth trying Dave’s remedy before worrying about warped rotors!
Photo on the left is the rotor after cutting the glaze but before riding. Photo on the right shows nice even marking after a whole series of stops from high speed.