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New (to me!) '77 CB400F - US model
K2-K6:
You have to be reallllly careful with those as they will snap off. Think the common advice on here is to heat them first, but they can be very tricky.
Looks like it was mainly stuck on pad corrosion. Rain and salted roads make easy work to get that going, if you're not using in winter then obviously less likely.
Interestingly, the original manual for the 750 says about the caliper, to use "silicon sealing grease" all around those pads and the interface with the piston. Presumably they are trying to exclude water as that stuff really resists any ingress. It specifically states "Do not use molybdenum grease, known as brake grease".
mattsz:
--- Quote from: K2-K6 on October 26, 2018, 11:20:30 PM ---You have to be reallllly careful with those as they will snap off. Think the common advice on here is to heat them first, but they can be very tricky.
Looks like it was mainly stuck on pad corrosion. Rain and salted roads make easy work to get that going, if you're not using in winter then obviously less likely.
Interestingly, the original manual for the 750 says about the caliper, to use "silicon sealing grease" all around those pads and the interface with the piston. Presumably they are trying to exclude water as that stuff really resists any ingress. It specifically states "Do not use molybdenum grease, known as brake grease".
--- End quote ---
I will be reallllly careful, I promise!
My download copy of the CB350F-400F service manual, which can be found just about everywhere, says "apply a coat of silicone sealing grease to the sliding surface of the calipers when installing the pads." Doesn't say anything about the pad/piston interface though. Is this grease heat resistant as well as water resistant?
mattsz:
--- Quote from: Oddjob on October 27, 2018, 02:27:14 AM ---Yeah it's silicon, they use that stuff to make oven mitts out of these days.
--- End quote ---
:-[ I suppose if I had thought about it, I would have made the connection...
Bryanj:
You will find the hole in the master nearest to the pipe end reduces to the tiny one at the base of the cone you can see. Personaly i would replace that piston, they are not expensive and you only got one neck
mattsz:
--- Quote from: Bryanj on October 27, 2018, 08:17:09 AM ---Personaly i would replace that piston, they are not expensive and you only got one neck
--- End quote ---
I will replace it - only one neck, as you say! Are there new pistons/pads made from materials that won't corrode as much, or at all?
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