SOHC.co.uk Forums > CB350/400

Brake lever sponginess

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Lobo:
The front brake on my 400F is spongy versus my K2, where you can barely pull the lever before the pressure gets too much for further movement.

The 400 has new hoses, and has been bled, bled, bled... no bubbles / cloudiness... nothing but clear fluid.  And stiil, (with a lot of effort, granted) I can pull the lever back to the handlebar. MOT fail?

Would the master cylinder benefit a rebuild with new parts / seals to cure this?  I only ask because I have my doubts ... due the pressure does not 'leak away' as you hold the brake lever on. (and if the consensus is this... the DSS kit ok / recommended?)

Answers, suggestions please?  I can't believe the difference in my two old & very similar systems; I've got the two extremes.....

busa:
have you tried dead legging the leaver  (tying it back to the bars over night  and loosen cap on resovior

tom400f:
http://www.sohc.co.uk/index.php?topic=4812.msg22283#msg22283

I refurbished mine using the genuine kit from DSS

Does the master piston move freely or is all your effort going into not moving it much (is it seized?)

Lobo:
Thanks guys.

Busa, nope, not tried that.... 'what' is that doing?  Return to work (abroad) today, but will try when I'm back in a couple of weeks.

Tom - thought you might have it, but then realised it 'pumps' (moves freely) fine when bleeding, with good fluid flow, so I don't think that's the cause.

Keep the thoughts coming!

Simon

LesterPiglet:

--- Quote from: busa on August 07, 2013, 10:45:14 PM ---have you tried dead legging the leaver  (tying it back to the bars over night  and loosen cap on resovior

--- End quote ---
'what' is that doing?
It lets any micro-bubbles rise to the MC. I do it everytime I bleed my brakes and it does improve the pressure.

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