SOHC.co.uk Forums > CB350/400
This piston must need replaced?
Eldrick:
--- Quote from: K2-K6 on January 24, 2024, 07:53:45 AM ---To the original question....the stainless piston option is a good one. Experience on here is that they are well made and work well.
As Bryan has already contributed, the seal, its groove, how clean that is, are one of the most crucial aspect of getting this (and any caliper) to work correctly.
They should be assembled with silicone grease (it's directed even in the very first 750 Honda manual) to work well and protect it from corrosion.
--- End quote ---
I noticed that the Haynes book suggests smearing the piston with Brake Fluid before inserting back into the caliper body. Is the silicone grease a better choice or is there a good reason to use it?
Thanks
Bryanj:
Nope and nope
K2-K6:
--- Quote from: Eldrick on January 24, 2024, 09:18:48 AM ---
--- Quote from: K2-K6 on January 24, 2024, 07:53:45 AM ---To the original question....the stainless piston option is a good one. Experience on here is that they are well made and work well.
As Bryan has already contributed, the seal, its groove, how clean that is, are one of the most crucial aspect of getting this (and any caliper) to work correctly.
They should be assembled with silicone grease (it's directed even in the very first 750 Honda manual) to work well and protect it from corrosion.
--- End quote ---
I noticed that the Haynes book suggests smearing the piston with Brake Fluid before inserting back into the caliper body. Is the silicone grease a better choice or is there a good reason to use it?
Thanks
--- End quote ---
They have absolutely no weather sealing on these caliper, the silicone grease excludes water from piston seal to effectively do this function.
Silicone grease is highly hydrophobic (near zero water attractive) with brake fluid the opposite in it's vulnerability to water ingress. Combine this with any available salt from road use gives effective electrolyte solution, causing the corrosion you've already got in the old piston.
Silicone grease is advised in the original Honda (first product disc brake really) and very effective.
It's your choice, but I use it on all caliper builds.
McCabe-Thiele (Ted):
I used Silicone grease when fitting the seals & pistons, I also use Silicone brake fluid.
Mikep328:
I had a poor experience with silicone (DOT 5) fluid a few years back when I tried it in my Ducati 996. The lever felt spongy and no amount of bleeding, etc would eliminate it. Went back to DOT4 and the brake returned to normal. I realize that liquids are not compressible and that DOT 5 is the spec fluid for some brake systems but I couldn't get it to work well for the Ducati. Might have been my own incompetence in some way but as the old saying goes, "Once bitten, twice shy." ;)
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