SOHC.co.uk Forums > CB350/400
Brake lever sponginess
Lobo:
Ta Lester, as I mentioned, will give this a try.
Does seem to be 'opposite' to what deep sea divers experience, ie bubbles forming (in their bloodstream) as the pressure reduces (the dreaded bends)... but who cares as long as it works!
Cheers,
Simon.
busa:
Thanks lester. I do this even with cars its just make any air seep back up the pipe.
just a thought have you tried bleeding it from the front brake light switch aswell. or from the banjo at the master cylinder this will also get an air lock in it and not go down the brake pipe..
or reverse bleed it open caliper bleed nipple use a syringe and small bleed pipe, drain all fluid out put new in from caliper end but do not pull brake lever. keep ya eye on fluid level in master cylinder so as not to over flow. squeeze fluid in slowly once bubbles stop coming through the master. leave syringe and pipe attached until you close the nipple.
Lobo:
Thanks busa, like the idea of reverse bleeding, though have little intention of undoing mid-joints due the mess & awfulness of brake fluid!
You guys given me a couple of new possibilities - cheers!
Simon
Dan:
I had a similar problem with my old GSXR.
Eventually, I found that the seals in the calipers were not allowing the pistons to slide freely. The pistons were moving to put pressure on the pads but the seals were flexing as the pistons moved and when the lever was released the seals pulled the pistons back. It took ages for me to find this but you could see the pads moving back when you looked closely. On strip down of the calipers, I found a resin-like build up - mainly around the seals and I the seal grooves.
Once cleaned out and reassembled with new seals I had a solid feel at the lever after about a minutes bleeding, whereas before I was bleeding the brakes for ages for no improvement.
If you haven't stripped your caliper for a while this may be worth checking if nothing else is working 👍
Dan
Bryanj:
Dan, the seals are supposed to pull the pistons back, in fact that is all that gives pad/disc clearance
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