Hi there,
I recently purchased a used set of B4's off of Steve(sleigh62) on here. They are an old set of brakes and have managed to free up the pistons and get them moving in and out. I have re-bled the lines and while I have lever pressure, the pads grip on half travel on the lever and full grip at full travel.
My interpretation is that I need more pressure in the system, I believe I cant be losing pressure as (1) the pistons would not return and (2) they would get progressively worse.
Any ideas?
Cheers
Noel.

