hey guys my daughters ds250 has had rear brake issues since I bought it second hand a year ago

front brakes work amazing
rear brakes …. handle and pedal feel a little hard and brakes apply but not very good I have to squeeze with all my force to get them to work and my 10 year old daughter cant even get them to work at all

so far I have put in new pads , cleaned and greased the slide, bled the brakes countless times with a vacuum pump . the caliper seems to be working fine with it off bike I hit breaks and it moves in and out freely I am stumped any help would be appreciated :th_smiliepullhair: