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Having problem with my 1975 f150 1st was having problems braking pedal went all the way down to the floor so i bled the breaks had problem with rear cylinders replace those still same issues replace all brakes front pads rear shoes now some of the problems went away break are nice and tight but after a couple times going forward and reverse and braking sometime the breaks go back to the floor seems like air or calipers loosing grip anyone might know what it could be.