| Author | Message | ||
     Longdog_cymru |
I have been experiencing pulsing or chattering under braking. I don't think it's a warped disc, there's not feed back through the lever. Today, I noticed this pitting. It is in 2 areas on the front disc, one is more severe than the other. I intend to pursue it through my dealer as my bike is still under warranty, but I'd like your thoughts first and I'd like to know if any of you has seen the same thing on your discs.  | ||
| Longdog_cymru |
Here is a closer look  | ||
| Froggy |
Looks like clumps of brake pad residue. Scrub it off with a sponge, that will get rid of most of it. Don't use the front brake to hold the bike at a stop. Also, dealer switched mine under warranty no questions asked. | ||
| Longdog_cymru |
and another view  | ||
| Froggy |
Ok you snuck that second photo in there, the first pic looks like brake residue, but the second one??? Stop parking under the acid drip. | ||
| Dentguy |
Looks to be about the size of the pad. Did it sit out in the weather in one spot for a while, holding water and brake residue between the pad and rotor? Stock pads? Just throwing some things out there. Could just be a bum rotor. (Message edited by dentguy on March 13, 2009) | ||
| Jphish |
I'd say a trip to the Buell dealer is in in order. Had warped disks before but Never had any rotor an any bike look like that. Even if you had water trapped in there somehow, you'd perhaps get some surface rust - but pitting like that ain't normal. But hey...we're Buell owners - eschewing any remnant vestiges of normal. j | ||
| Longdog_cymru |
Nope, bike has never stood. I ride it most days each week, all year around. The bike is 13 months old. There are 2 areas like this on the disc, one is as you see it, the other is not so bad and is about 30 degrees away. | ||
| Jphish |
Longdog - Can't imagine it NOT being covered under warranty. Thats clearly a defect in materials/workmanship. Don't know how the UK laws apply in this case, but the Magnuson act here would make it hard to argue against a mfg fix. Don't know how YOU could have caused it ?? Unless you got a pitbull teething on rotors. j | ||
| Etennuly |
Seein's how it is a stainless rotor, rust shouldn't be a consideration. That looks like a flaw in the material that the rotor was made from. To clear up the pulsing/chattering, I put Lyndall pads on the front. Break it in hard. Hard stops from 10 to 0, 20 to 0, 40 to 0, and 60 to 0, as quickly as possible. When you get to 0 do not hold the brake on. After the last two the smoke will be flying and the rotor will be blue. Then just ride for a while to let it cool down. I haven't had the problem since. | ||
| Longdog_cymru |
I cleaned up my disc with Muc-off brake cleaner yesterday. Went for a ride today and for the first 100 miles, it felt nice and smooth and progressive. Then the pulsing/chattering gradually returned. My take on it is a manufacturing defect, just like Etennuly says. The pits look like little cavities in the casting process. | ||
| Ulyscol |
Longdog_cymru, Very curious about that pitting. Could you measure the thickness of your disc and post the dimension? Wondering if that could be some inclusions in the material. | ||
| Etennuly |
I cleaned up my disc with Muc-off brake cleaner yesterday. Went for a ride today and for the first 100 miles, it felt nice and smooth and progressive. Then the pulsing/chattering gradually returned. Mine would do exactly the same thing. I kept cleaning the rotor until the stock pads wore out. Cleaned it, put the Lyndall pads on, broke'm in and it has been great ever since. | ||
| Longdog_cymru |
Ulyscol Yes, I'll measure and post the results. Etennuly I have a set of EBC HH pads to go in, but I wanted to get this pitting issue sorted out first. | ||
| Court |
>>>>but the Magnuson act here would make it hard to argue against a mfg fix. Magnuson-Moss is unrelated. | ||
| Johnboy777 |
""Magnuson-Moss is unrelated"" Correct, they co-sponsored the Act, but they're not related....just friends. . | ||
| Jphish |
Correct Johnboy, their names both began with 'M', but just unrelated friends in opposite houses...And back in 75' when a Senator took a 'wide stance' it meant something entirely different. | ||
| Ourdee |
Inclusions or porosity? | ||
| 99savage |
Will wager that the problem is porosity. - There are holes outside of the path of the pads. Quick check - Using good light & a magnifying glass look inside of the bored holes. If you see pits there it is porosity for sure. More exotic check - If you have access to an ultra sonic thickness tester, check the thickness in the area of the pits & someplace remote from them. If you come up w/ different thickness you know there is subsurface porosity (physically you know the rotor is the same thickness every place) You COULD remove the rotor & have it Xray'd but it would be simpler & cheaper to give up the fight before that point. | ||
| Longdog_cymru |
Result! I went to my main dealer yesterday, (a 305 mile round trip), and they changed the disc rotor and can under warranty. It is the second time they have changed the can for rust and said it was "a significant issue for Buell". They have changed a tremendous number of Buell cans. The first time, they gave me a Cam Coated one, but it still rusted!!! On the most important problem, the front disc rotor, they were non-committal on the inclusion/manufacturing defect that I believe is the fault. However, they said that if the disc rotor was warped, that would be different as "it is not an unknown fault with Buells". So I said, OK, maybe it's warped! They measured the runout at 0.25 and said the tolerance is 0.45, (I assume that is mm?). On the basis that it had started to warp, they changed it under warranty. The ride home was a real pleasure!!! |
