SOHC.co.uk Forums > CB350/400
Brake master cylinder rebuild kit
mattsz:
I have a brake master cylinder kit from 4 into 1:
https://4into1.com/reproduction-brake-master-cylinder-rebuild-kit-45530-377-305-cb360-cb400f-cb450-cb500t-cb550-cb750/)
I know not everyone has had success with these rebuilds, but what the heck...
Regarding lubricating the reassembling bits: the Honda manual says to use brake fluid. The 4 into 1 kit includes a tiny tub of pinkish grease, but doesn't say what kind it is or exactly where/how to use it (I've got silicone grease for use in the caliper, as recommended in the manual). I've seen a Youtube tutorial in which Marvel Mystery Oil is used. I'm tempted to forego the grease and oil and just use the brake fluid as the manual recommends - anyone have better ideas?
Bryanj:
Brake fluid on the seals WEAR GLOVES use the greasin the area above the circlip to try and stop corrosion like there was when you took it apart.
When rebuilt these masters frequently need bleeding to banjo fitting.
With gloves on put a finger over the outlet hole and pull in lever, release and re apply finger, release lever. Repeat until you get pressure on finger then whilst holding lever in quickly fit pipe with banjo bolt and washers----oh should have said have them handy before starting!!
mattsz:
Thanks for the tips Bryan! I have some big syringes, one of which I was going to use to try to fill the system from the bottom through the bleeder, but if that doesn't work out, I'll remember your suggestion...
Bryanj:
It wont is the easy answer, i find well over 95% of the masters need to be bled the way i said, also forgot to mention make sure both the holes from reservoir to bore are clear one is tiny
Trigger:
--- Quote from: Bryanj on August 09, 2020, 10:00:21 AM ---It wont is the easy answer, i find well over 95% of the masters need to be bled the way i said, also forgot to mention make sure both the holes from reservoir to bore are clear one is tiny
--- End quote ---
I would say the same Bryan.
You have to bleed the M/C first as Bryan has explained or fit a banjo with a bleed nipple on the M/C ;)
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