SOHC.co.uk Forums > CB350/400

Master cylinder bleeding

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K2-K6:
Have you dismantled to clean it through ?

Athame57:
I bought a replacement from DSS it looks a little different but it works fine.

fogrider:
I've sometimes got things going by placing a long clear tube over the bleed nipple and sucked on it whilst working the lever.
Worth a try, minimal cost.

McCabe-Thiele (Ted):
With brakes I'm a big fan of either pressure bleeding where possible from the top or suction from the caliper end.

K2-K6:
Ultimately it's about that vent/passage between the piston bore and the reservoir for any brake system.

If it's not competently open, clear and able to pass through fluid easily, then the system won't work as designed.

There's almost nothing in them, with the lever piston first closing that vent pathway then subsequent travel pushes pressure into the now sealed line to caliper to exert force on the pistons/pads.

As soon as the lever is retracted the line then has to be filled with new fluid in volume to how much the pads have been worn. It's this that keeps the lever travel equalised during use. Any impairment on that feed flow will stop the system working/bleeding etc. It just shunts the fluid down and then retracts the fluid (which it shouldn't do) because a vacuum is held in the operating line when that shouldn't be so.

Because you can feel it suck with your finger on output that shows the main seals are functioning,  but it should be able to pass backward along the master cylinder bore without doing that, and facilitated by the vent being open.

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