thanks 1 bad. no there is no adjustment at all on this arm. i know what your saying though as the power brake unit that came with the front disc brake system i bought does have the adjustable arm. but does not fit with the 426. so i got the same bendex unit the cars came with. installed exactly like the service manual. i took the whole unit out to be sure there is no adjustment and it looks like it just needs an another arm about an inch longer. its a must have as it does not retract far enough to shut off the brake light switch.