Braking performance

[fazersharp]

[quote author=Hedgetrimmer link=topic=18877.msg218783#msg218783 date=1450017088]
[quote author=Gnasher link=topic=18877.msg218764#msg218764 date=1450008430]

The length the piston protrudes has no bearing on their performance while in normal use inside the caliper bodies with a pad and disc.  If the pad has no friction surface left, is not square to the disc or held off due to seized rivets/s/warping or the pad is twisted in the caliper body (very common with EBC as they are slightly smaller)  power is greatly reduced.

The thickness of the disc is purely to ensure reduced sensibility to constant heating and cooling which warps them and to ensure longer service life.  The fact these have semi floaters is another way to reduce their thickness, thus unsprung weight, fully floating disc are thinner still.  The brakes fitted to the earlier and later Fazers are eye popping the Fazer is really over braked, but they need carefully looking after to keep that performance.  Brakes are a bit like eyesight they slowly deteriorate and you don't really notice it until you either need them in a hurry or you ride another bike who's brakes are tiptop.

If you run a finger across well-worn discs, you often find grooves running around them, which I would guess also means less pad contact area and so less braking efficiency too?
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The pads will wear into the grooves, so shouldn't really make much difference.
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You could also argue that any grooves would add to the surface area and make for better brakes once the pads have worn to match ???