my rover 114 just failed its mot .on rear brakes, changed the master cylinder ,rear cylinders,rear shoes rear drums,bleed it to death, no air comiong out ,adjust rears up with handbrake disconnected,still no good so week that i can turn both rear wheels,if someone has there foot on the brake,ive bed the brakes in for about 60 miles,fronts are really good,so is handbrake,any thoughts