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Old 18-07-2021, 03:50 PM   #1
crawsue
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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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Old 18-07-2021, 05:19 PM   #2
Mr Gazza
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Well you have the advantage in your locale that you can extend the braking time by doing it going downhill..

Give the discs a good wipe all round with clutch and brake cleaner before you head out.

Good luck.
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Old 18-07-2021, 08:14 PM   #3
Nickj
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Quote:
Originally Posted by crawsue View Post
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”....
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
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Old 06-01-2022, 04:54 PM   #4
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Quote:
Originally Posted by crawsue View Post
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”....
I’ve had this with Galfer wavy discs, always used to get an MOT advisory despite them being perfect at 120+ mph on track. Oz had similar with another make of wavy discs, he removed the bobbins and checked the rotors on a surface plate, perfect. Since discovering this, I swap the left and right pads before MOT, it passes with absolutely no pulsing, which returns when the pads bed in again.
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