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Finally retired and building my project bike
McCabe-Thiele (Ted):
TBH most of my experience with disc pads is on cars over the last 58 years of working on my own vehicles (35/36 in all excluding motor cycles ) plus working in the motor trade full time for 5 years with my late father who was a RR/Bentley apprentice in the final years of WW2.
My Dad started off working as a motor mechanic in the evenings post 1950 until he and his best mate at RR opened a Vauxhall Car Dealership initially in Mickleover moving to larger premises in Derby in around 1960. After their dealership was bought out by a succession of car retailers he became a Main Board Director of Bristol Street Motors International headed back in the day by the late Harry Cressman of BSG International.
My Dad supervised me fixing my first Honda a 250 Dream then guided me during my early Mini years - I was effectively raised as his apprentice from the age of 14 until I left Uni aged 23. I mention this as we both found squeaky brakes really annoying - feathering seemed to work on disc pads & also as an aside reduced brake grab on drum braked vehicles.
It was always my experience that the harder the brake pad the more regularly brake squeal occurred. I have always been a fan of "soft" brake pads as they used to reduce disc wear but produced a lot of brake dust - they did not last as long as "harder" pads and would fad sooner.
Once Asbestos was banned the issue seemed to become much more frequent as did disc brake run out due to warping discs - more so the early vented type. The move to sliding callipers has not always helped. Car manufacturers started to tell us it was a feature of the vehicles as they seemed to have no answer.
I have found feathering the disc pad not only works for many situations but it is now an integral part of modern car brake pad design. I am not claiming one size fits all - it has overwhelmingly worked for me.
Trigger:
We are on about bikes with floating calipers Ted. It is a totally different from car calipers or any other type of fixed caliper :o
McCabe-Thiele (Ted):
Yes I know the caliper design is different - more similar to a single piston design like many cars with sliding calipers only difference seems to be the length of the pivot point.
Cars have a noise generated from where the pad meets the disc. Even top brands like Merc struggle with brake noises since Asbestos went away - they came out with anti-squeal shime etc - none worked for all.
I did wonder if the SS type disc material was part of the problem.
It did occur to me if multi piston calipers were part of the reason Porsche and the like seem much less prone. Could some sort of surface heat hardening be the cause?
On my Jeep the caliper pistons are not metal - they are a plastic type of material - might be to stop them sticking in wet conditions.
Trigger:
Same stainless material disc on a 750 and no squeal. The 750 piston does have a domed cap that goes in the piston so the pad is not sitting on a flat against the piston.
Johnwebley:
You saying that, the 500 have a circular nylon washer between pad and piston
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