Hi Richard, Good to hear the cleaning helped it pass. I wonder if they got something onto your pads that's made them dreadful afterwards. Dreadful in which way - poor grip, vibrations, or squealing ?
Hi John, Fluctuating pressure. I tried a few high speed stops to clean things, to no avail. Now got the bobbins soaking in releasing oil - will give everything a going over with brake cleaner tomorrow and if that doesn't work I'll strip the lot down. Can't see any obvious runout on the discs.
Did they have the wheel out ? If so You could try undoing the fork pinch bolts, and make sure the legs are correctly aligned. If ducati won't replace my discs I'm going to try a pair of brake tech ones. Not cheap but worth it imo.
I can't imagine they won't change them...im on my fourth replacement set. They are replacing hundreds of sets across europe on multis and diavels.
Johnson, that's why they want to reduce the number. On my last mts p&h said ducati uk would not replace them, even though the run out was within the prescribed range. We shall see soon enough, it's going to snells this time
Finally took mine to Ducati Manchester this weekend , to be fair they were very good about it and agreed they need replacing , so news ones on order @ 6k miles
I had 2 sets of discs under warranty on my M1100 evo. none of mine had visible warping so no idea what was going on. Came back each time in under 1000 miles. (they fitted new Pads each time too) got sick to claims taking weeks and bought a pair of Braking wave discs Never had a problem since.
Good. So no vibrations under high speed hard braking now. With what did they change your discs? Stock OEMs?
no absolutely none , they were replaced with the same type of disks , or at least they looked the same
What I find stricking is I cant see anything wrong with my discs with my bare eyes, untill I brake hard of course. Gonna use some flexible rods and line it up against my discs to see if I can discover the warping that way.
You would be better using a proper clock , I couldn't notice mine either till I rode the bike It only needs to be a small amount and I don't know what would be considered unreasonable It certainly wouldn't take much
90+% of the time brake judder is in fact 'variance of thickness'. I never knew about this until I had a M696 with this problem. Purchased 2nd hand with 6 month warranty left, 1,100 miles. Everything fine until I went for a spirited ride, and tested it's acceleration/braking. Noticed a feint judder as I came to a halt that got worse over the next 50-odd miles. Decided to check for warpage using a dial gauge, was within tolerance but noticed that some areas of the disc had wear ridges against the centre of the rotor whereas some areas on the disc (same disc/side) had barely lost their cross-hatching. Mic'd the discs and there's my answer. It is considered that there are four main reasons for disc thickness variation (or DTV): 1) Poor quality manufacturing 2) Incorrect fitting 3) Sticking callipers (bent pins/filth) 4) Poor bedding-in (not allowing an even layer of brake lining to form correctly) Well I certainly didn't cook the brakes and the bike was immaculate/correctly set up, so it can only be no.1 But Ducati still said no to my warranty, saying that it was a wear & tear part (really, after 1,100 miles???) btw 1st time experienced this in over 30yrs of motorcycling...
just went to a pro and he measured the discs with a clockmeter there was a offset of 0.3mm. I dont know the allowed offset of the OEM discs, but he things that 0.2mm offset is the maximum and higher than that, discs should be replaced. BTW, he also experienced the vibrations. And he thought the speed they were felt was weird, since it only appears at high speed braking, not a low speed breaking wich is typical for warped discs... But does anybody here know what the offset numbers are for the discs? He will start to replace the suspected disc and replace that one. We'll see if that will cure the issue. The discs is being ordered. Normally I'll be able to share an update next week from now..
to continue the mechanic used this clock to measure if my break disc was warped: while turning the wheel, we read a difference of 0.3 milimeters. this is with the tool at the surface of the disc, where the brake pads touch the disc. Alternatively, he also measured the disc from the top, at the border of the disc, like so: Normally, discs arent measured this way, but we did see the difference was huge!! Much more than 0.3mm! more like 0.6-0.9mm.. Mabye that difference caused the vibrations at specific higher speeds...? Because imagine the pads touching the disc while its moving up and down? I can imagine that must give some feedback to the handlebars in some way... But fact is, I am not experiencing normal warping = vibration at LOW speed. I get it only at high speed braking! We are still guessing, and we are gonna change that disc to see what will happen.
