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I was having the S MoT'd last tuesday at my favourite Central London biking emporium (they're an oasis of expertise and good advice and get a hell of a lot of trade from C. London couriers) and got on to the subject of warped BMW discs, and why many of them suffer it. They've had quite a few courier'd R259s in with disc trouble and they've all been using EBC HH pads.

Now, they themselves really rate the pads as giving excellent stopping power but from experience warned against their use on BM discs - apparently Yamaha discs are soft/warp-prone too. They reckoned EBC 'Green' are the best to use which once bedded-in give nigh on the same stopping power.

EBC Greens suck big time....infact I was told they'd stopped making them??!.....they are the ones made from Kevlar?.I used to run them on a few 2 valve RTs.
The reason that BMW and Yam discs warp is that EBC HH are the highest friction rate available....this causes lots of heat....and warped discs sometimes.I used nothing but EBC HH on my S for 120'000 miles without any problems.Maybe the fact that the discs were the larger diameter Evo models came into play?
Heard the same thing happening on Aprilias too.
If you want something pretty close to EBC HH......but a bit more progressive/less bite...try Ferodo Platinums.
Bailey.

Strange that Bailey - I had greens in my CBR6 and once bedded-in (seemed to take quite a while, must admit) they were great. I was cleaning out Rods' Blackbird's calipers the other day and noticed it had been fitted with Greens.

I had HH's in my first R1100R but for only 30k - seemed alright - but talking to the guys on tuesday, they reckoned the BM's they'd seen with warped discs, all had HH's fitted. Could there be an environmental effect ie where the bike's being used/what type of riding?

Any experience of Carbon Lorraine stuff??

I tell ya what.....if you were hard strapped for cash...EBC Greens are what you should use....they lasted for ever
Maybe they'd work better in a bike with 4 piston calipers.....on me old RT's it was really quite scary.
I've never used Quiche Lorraine stuff....I'm sure someone on here has tho!
Bailey.

Grom,

Your 'S has been running EBC HH pads since about 18k miles, unless you changed them since taking it off my hands. Are your discs showing any signs of warpage?

Cheers,

Paul

Paul wrote:Grom,

Your 'S has been running EBC HH pads since about 18k miles, unless you changed them since taking it off my hands. Are your discs showing any signs of warpage?

Cheers,

Paul

None at all mate - just having a convo with Matt at the MoT shop and he happened to mention warped discs on 259's and asked if I'd had any problems. Brakes feel fine'n'dandy on this beastie

Oh...had a great ride out yesterday - did 'the long way round' up to Cambridge to see a mate (it'd make a nice long half/fullish sunday run actually, if you guys have the time) and finally 'bonded' with the S again. I can understand why folk jump on BM's after riding Jap sportsbikes and don't like them - they do take time to get used to.

Coming back last night around 10pm down the road I used to travel almost every w/e was bliss. Cool night air, engine smooth as you like, Lasers banging and popping on the overrun. Simply lovely.

The fact that the disc's bolt directly to wheel are what kill e'm,because there isn't any disc carrier to help get rid of the heat.

Chris

winger wrote:The fact that the disc's bolt directly to wheel are what kill e'm,because there isn't any disc carrier to help get rid of the heat.

Chris

I've also heard this - the alloy wheel isn't enough of a sink for heat energy, then again the warped discs Matt was referring to were (mostly) on 850R's.

In answer to the question about Carbon Lorraine brake pads - I once owned a Hayabusa and when it came to pad change time I put a set of CL pads in. They were an excellent set of pads and I had no problem stopping that particular bike. I ran the bike for around 12k miles and during that time the discs shows no signs of excessive wear or warpage.

Odly enough - even though I've had one of the discs hot enough to smell (yuck) because of the caliper binding up (due to corrosion) the disc never seemed to warp.

I think the EVO's may be less prone to it because there's slighty more area to disperse the heat off???

I have run EBC HH for about 20,000 miles and now have fitted Carbonne Lorraines equivalents for the last 28,000 miles.Did prefer the intial bite of the EBC,s but overall braking power is about the same.
As for discs,mine are pretty much ready for changing now anyway.Cant say i noticed one set of pads wearing the discs more than the other.But maybe the EBC,s good biting power has something to do with it
gus