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I think I will have to replace the front disc`s on my yr 2000 R1100s. They have become "pock marked " They are Brembo brakes, and they still appear to work well, and have recently passed the MOT. If I have to replace them, which is the cheapest option,while still maintaining efficiency.

Reg - are these those small black spots you get on the disc's surface? If so I've had them on nigh on every bike I've owned, and not been too worried about it. If your MoT guy's happy (and I'm sure he's someone you trust) I wouldn't be too concerned for the time being.

Richard,
it`s a bit more than normal. Quite pronounced in places ,as if it is where the pads have been for some time while the bike has been standing,and the damp has corroded the disc. My MOT guy said they would need watching but are OK for now.

Braking discs are very good, but i think you can only get them from wunderlich so failing that go OEM as they are cheaper. You could try
http://www.allbikeengineering.co.uk/index.html
They do older beemers, but may well match or manu them. But dont let them touch your bike, the mech has two left feet for hands.

I have the same problem, standing bike in winter (even after washing) would have rust patches on disc where it was covered by the calipers.

I think it has affected performance a bit but then again the front brakes could do with a strip and clean....

let us know how you get on, I'd be curious to see how much it would cost and what difference it makes.

Ade

I have had both front discs replaced under warranty over a period of 18 months.

After washing the disks would corrode and pit at the calliper position within approx 3 days if stood during the winter months, even after drying.

The only way to prvent this after washing has been to turn the wheel the next day after the discs and pads have dryed completely.

Never had the problem with the rear disc!

The front pads are sintered metal and the rears aint.
The metal in them cause them to rust/corrode the disc when wet.
I wouldnt worry reg,as long as there are no cracks or serious defects.
gus

My discs were replaced by S*C just after I bought the bike (mines a 2000 model too) The discs had, what looked like air bubbles in the metal (if that makes sense), they were pitted all over. There were apparently problems with a batch of discs around this time.