Quote:
Originally Posted by crawsue
I pm’d Vince (Luddite) earlier as I have a braking sensation similar to Mr Gazza, long pulses as I brake slowly to a standstill but perfect braking at speed. New fluid at last service, and Scotchbrited the discs ...to no effect. I’ll give Mr G’s tip a try on my next outing and report back. All bobbins have some free play, a warped disc gives a more of a shudder...this is a languid “pulse”....
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The idea is to get the surface layer of the disc hot enough to let it change its composition, as the hot metal cools the crystals it's made of can change their state a bit. Different surface states give different levels of friction.
So it's long slow braking from speed, the disc wants to be hot enough that you don't want to put a finger on it, some even say a gentle glow is good if they're cast iron but I think that's a bit much for a thin bikes disc but OK for a thicker car disc.
There is tons written on this