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New (to me!) '77 CB400F - US model
mattsz:
--- Quote from: Laverda120 on December 05, 2018, 10:09:29 AM ---I tried to repair the original front caliper on my 400/4 but it was beyond help with both the fluid union and the bleed nipple snapped in the housing. I bought a pattern caliper from DSS along with a master cylinder repair kit. The master cylinder was an easy rebuild. The hardest part is removing the internal circlip to enable piston removal. You need to buy a cheap pair of long nose or circlip pliers and maybe grind the ends down to fit. Easy job to do though and you keep the original master cylinder with the correct exterior finish, the pattern ones are painted black.
--- End quote ---
Thanks Laverda - I was planning to purchase a stainless steel piston to replace the slightly pitted/corroded caliper piston (and a new piston seal, too, of course!). But when I initially removed the caliper, I wasn't able to loosen the fluid union or bleed nipple. So before I buy anything, I'll see if I can remove those items without damaging anything. Any advice for this? I've got plenty of time for penetrating oil, etc - I could even simply drop the whole unit into something to soak, for months if need be.
I'll suppose I'll dismantle the MC as well and see how things look before I buy anything...
taysidedragon:
Try some heat on the offending parts. It may be enough to break the joint. Need to be careful with the heat on the aluminium caliper body of course.
If that fails then soak the body in a container of diesel oil or penetrating oil for a few weeks.
Good luck!
mattsz:
--- Quote from: taysidedragon on December 05, 2018, 11:18:51 AM ---Try some heat on the offending parts. It may be enough to break the joint. Need to be careful with the heat on the aluminium caliper body of course.
If that fails then soak the body in a container of diesel oil or penetrating oil for a few weeks.
Good luck!
--- End quote ---
Thanks taysidedragon! I'll give it a try...
Bryanj:
Use one of the disposable cartride plumbers torches and warm the alloy round the fittings till slightly uncomfortable to touch then use a long six sided socket with a tee bar so you are turning evenly not twisting. Never failed to get one out yet. If the pipe union is really bad cut the pipe off flush with the top of the nut and follow same instructions.
mattsz:
--- Quote from: Bryanj on December 05, 2018, 12:02:37 PM ---Use one of the disposable cartride plumbers torches and warm the alloy round the fittings till slightly uncomfortable to touch then use a long six sided socket with a tee bar so you are turning evenly not twisting. Never failed to get one out yet. If the pipe union is really bad cut the pipe off flush with the top of the nut and follow same instructions.
--- End quote ---
Cheers for the tips Bryanj - I don't have a t-bar, but who doesn't like to buy a new tool?!?
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