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If the lever has to be pumped then there is air in the system, use a brake bleeding kit that forces fluid in or draws it outOr try pushing the caliper pistons right back in, holding them there & bleeding Alternatively remove calipers & tap in different positions
Hi, this means that the pistons of your front brake are not recovering properly.
If you feel confortabe with that job, you must remove brake caliper , then remove cilinders and all the protection rubber and sealing rings. Give the cilinders a good cleaning (check for scrathes or rust) replace sealers and reasemble all. Change the brake fluid and purge the circuit properly
similar to bleeding brakes, pump up the lever, then let the fluid out down at the slave cylnder at the bleed nipple. May need to turn the bars or lean the bike so ther is no high point at the first banjo bolt on the clutch cylnder. Its common for the slave cylnder seal to wear out, and this causes fluid loss and air back into the system
I expect it has air in the slave cylinder. Bleeding the brakes will get rid of the air. Check if the brakes are spongy. If they aren't, make sure the spring plates behind the pads are fitted. They ensure the pads are pushed back into the calliper a little bit, reducing heat and wear.
you might have air in the system, if you have drums on the rear the slave cylinders could have a slight leak that is letting in the air, or, the master cylinder is doing the same, you can check to see if the carpet is damp inside under the dash where the brake pedal is, even if you are not loosing fluid it sounds like you have air in the system, if you are a diy person you might be able to bleed the air out but if you have a slight leak anywhere this will not make a difference as it will just get air back in the system again...hope this helps
Does all the usual tricks include wrapping a thick bungee cord around the brake lever and leaving it overnight? That should force any residual air bubbles to the top of the system where the master cylinder should replace them with fluid.
If that does not work try installing some new bleed screws, even speed bleeders.