Front Disc Warp

StuartSF2015 · Mar 21, 2019

Spring has sprung and early short trips to clear cobwebs undertaken, all is well with my biking world. MoT due and and advisory received on my front brakes as they were pulsing under test. Possible/probable disc warp. Bike is 4 years old with 9.5k enthusiastic, without stoppies, miles on the clock.
Anyone other 961ers out there had similar?

Britfan60 · Mar 22, 2019

Me. Close to 7K, pulsating from disc. I do however think the shop that changed my tires may have let the wheel fall over. But of course, try proving that.

oldbeezer · Mar 22, 2019

I'm not familiar with the disks on the 961. Are they full floating? I had a Duc with full floating disks, the buttons would get dirty and sticky preventing the disks from floating. The effect was the same as a warped disk.

TonyA · Mar 22, 2019

It worth checking that first .

StuartSF2015 · Mar 22, 2019

oldbeezer said:
I'm not familiar with the disks on the 961. Are they full floating? I had a Duc with full floating disks, the buttons would get dirty and sticky preventing the disks from floating. The effect was the same as a warped disk.

Sounds like a good shout. I'll get some WD40 on them.

TonyA · Mar 22, 2019

Just on the disc buttons of course !

Fast Eddie · Mar 23, 2019

I once knew a guy who did put WD40 on his discs to stop them rusting if he wasn’t gonna ride the bike for a while.

When I expressed horror he was unmoved and said it burns off after a few miles and is fine.

I was, and remain, unconvinced !

Probably extends pad life though...

ntst8 · Mar 23, 2019

I had a mate back in the day who took a low mileage Ducati Darmah for a test ride, he was surprised at how appalling the brakes were. Same thing, but a shop in that case was spraying the discs and hadn't warned him.

iwilson · Mar 23, 2019

Warped discs are considered by many to be a bit of a myth. There are a number of other causes of the pulsation feeling (that are a lot cheaper to fix).

https://www.brakeandfrontend.com/warped-rotors-myth/

Eljahara · Mar 23, 2019

StuartSF2015 said:
Sounds like a good shout. I'll get some WD40 on them.

Stuart
I had this “pulsing” on the floating discs on my Triumph, the guys at the dealership simply used an air hose to blow the crap out and let the discs float - don’t go full blast or you will blow bits out that need to stay there!
John

Britfan60 · Mar 23, 2019

A. Brake pads are porous, so the is now way I'd spray the whole disc with WD40 for fear of absorbtion. I was told by AF1 to take a toothbrush and hot soapy water and clean btw the floating disc and inner mount. No avail. I tried with a soft brass wire brush too. I can actually see a gnats hair of a gap at one spot on one disc. Guessing that is wear my problem lies. Tried pushing the gap closed but didn't work. I'm not going to give up though. Over time, the pulsing lessoned a bit so I'm going to keep trying. I can also see a very faint strike mark on the edge of the same disc too, so I still think the shop set my wheel fall over. It was fine on the way there. Pick up the receipt and bike....it said "front brake pulses" to protect themselves.