pulling to one side when braking

[Fostang]

Mine tends to jerk to the right. When I'm about to take a look and replace the part it'll work fine. They're both new calipers and the wear is the same on both. Only thing is that sometimes the right tire will make a noise when I take off as if it were staying stuck.

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67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s