Long story: My Monster failed a MoT a few years back because the front discs were warped - or it may of just been an advisory - can't remember now. At the time. I had virtually no workshop facilities but I replaced the discs with EBC ones The underlying problem was that the calipers were sticking and not freeing off - thus overheating the discs and that caused the warping. When I had sorted myself out with a decent garage and workshop, I stripped the calipers and sorted out the sticking. Problem was that I didn't do it quickly enough and the disc were slightly warped again. Now, they seem worse than ever as it is unpleasant to ride the bike because the braking is unpredictable. I am not sure whether the warping has gotten worse, or that I am just noticing it more. I need to take off the wheels for new tyres this week. I will double check the calipers but I am pretty sure that nothing is sticking. So, I will have to change the discs again. Anybody got any recommendations of on make? EBC was what I used last time but there is the more expensive Bosch ones or cheaper Ebay shit. Brembi - I meant Brembo not Bosch! F*c%wit!
Are you sure they warped ? Have you actually checked them for runout ? Here is my reply from a similar thread....
Do they move reasonably freely? Not sure of the official test but I freed mine until I could move them freely enough between thumb and forefinger to get an audible click.
I hate the intro and it’s probably not the best vid out there but it explains it well Also check out Delboy’s Garage on YT, he’s bound to have something on it and his vids are good.
Pfm Discs - got them on my RSV4 factory, expensive to start with but, you can buy all the component parts nice and cheap - ie if you warp a disc, 90 quid for a replacement... http://www.thestopshop.co.uk/pfm-disc-shop/ Any discs that need replacing here on, on my bikes will get these.... Plus...if the pads are sticking then maybe a caliper strip down and clean...much cheaper to try that first...
I had the same problem with mine. I replaced the discs with EBC VEE waves (EBCVR624BLK) from Demon Tweeks and cleaned up the caliper pistons. Perfect. Also... I had a Guzzi Breva which had the same issue and the same Brembo discs as standard.
I watched a couple of YouTube vids on seized bobbins on floating discs last night. I have had bikes with floating discs for years and not just Ducatis. I never even considered this seizing as an issue. But... it does fit with my symptoms. I have taken the wheels off because I am dropping them off at V-Ten tomorrow for new tyres. I had a very quick inspection of the from discs and there does appear to be seized bobbins. When I get the wheels back, I will have a good look. I'll get some brake cleaner anyway. I may use WD40 to free up the bobbins an then clean up with brake cleaner,
I put back the wheels with new tyres today. I tried to un-seize the bobbins on the front wheel. I haven't been out on it yet but the front wheel now spins freely but when I apply the brake, the wheel stops immediately with a 'clunk'. Then when I let the brake go, the wheel spins freely again. I'll take it out tomorrow morning but it looks promising!
Brakes work well now and so it must of been seized bobbins. Got new Contisport tyres on and they are shit. Actually no: first of all, I hadn't realised how bad the state of the b-roads on my route had got. I blamed my old tyres but the road surface is still terrible with new tyres. Second problem: V-Ten really pressed home that is very important to take it easy for the first 100 miles and gave me an Avon sticker to remind me. Heard it all before but was told a story about a Fireblade owner who left one night in the dark with new tyres. They have small high vent windows along the side of their unit. The guy spun up the tyres and he was seen through the windows flying without a bike. Concussion and bust three ribs. I am taking it easy for the first 100 miles...
Glad to read the brakes are ok now, and yes, you need to scrub those tyres in. Same thing with new brake pads, got to bed them in as well.
Had brake issues again last Friday. I talked to EBC technical support today about the problem. The conclusion that I have reached is that the YouTube videos are bullshit. I am annoyed with myself because I know form experience that much YouTube 'technical' stuff is wrong. The bobbins don't seize. The discs should not move side to side but they 'float' to allow the hot disc to expand outwards whilst the relatively cold disc hubs contract. You can't turn the bobbins because the are square internally, I was told. My problems are with the calipers sticking.
You certainly can turn the bobbins on my 999. There are a lot of very knowledgeable people on this forum, so if unseizing bobbins were not a valid exercise, I'm sure it would have come to light before now.
Certainly mine are round on both my 748 and my M1100S. Certainly mine can turn, they also can get a bit stuck and gunged up with brake dust/road gunk/corrosion and IMO it never hurts to free them off. Also there will be a very slight side to side movement on the outer rotor if it is a floating disk, but we're talking VERY slight.
Most discs are "semi-floating". They can move laterally, but this movement is restricted by little spring washers on the bobbins so that you will not be able to feel any slack when you try to wiggle the disc. Fully floating discs (mostly used on race bikes) don't have these spring washers, so you can feel movement. You can also hear it .. they rattle (a lot). So, back to the problem. As I said earlier, I doubt that warped discs is your problem. Bobbins can seize and this is often blamed, but is seldom the real culprit. I could go through the whole explanation again but its much easier (and less repetitive) simply to say .. did you read the post that I linked to in my earlier post on this thread ? All is explained there. What exactly are your symptoms and at what speed do they occur ? And ps ..... the bobbins are round in every relevant respect. There are no square bits.
Excuse me if I get a little cynical of the stuff available on YouTube but I think a lot of it is crap. EBC Technical Department told me that the bobbins are square and don't rotate. This conforms with my experience - and almost wrecking Bosch drill. I may be wrong and the Technical Department may be wrong, or have misunderstood me, but I would want to see hard evidence of this. I could feel pulsing through the lever and pushing the bike around with the brakes off would enable me to hear the disc rubbing against the pads and freeing off like a warped disc would. However the bike is not doing it now and there is some feeling of pulsing from the lever but nowhere near as bad as last week. I think that all of the stuff about seized bobbins is crap. The point of floating discs is allow movement required due to expansion of the disc due to heat. No reasonably small amount of material, like brake dust, is going to interfere with this. Also, as the wheel is spinning, any dust is centrifuged outwards. If I am wrong (and I accept that I may of missed something) then cite proper references to contradict me - as opposed to baseball cap wearing YouTube stars.... Is the cap thing about making you look credible, or something? It does seem to be a YouTube 'thing'.
EBC uses a patent system where the bobbins have flats that prevent them from rotating. All other manufacturers use round bobbins http://www.ebcbrakes.com/Assets/sdrive.jpg
