it's all been said already about adjusting the rear brakes, but my little habit is to use a 1/4
inch drive socket to turn the adjusters. Put the side that goes onto the rachet onto the adjuster, pick the appropriate size allen key ( i usually use a 6 mm allen key & socket) & the risk of rounding off the adjuster is significantly reduced. The name for a shifting spanner around here is the nut f@cker. As the rear brakes aren't self adjusting, finding they're rounded off isn't fun. Later Nissans like the B310's & Stanza's had the star shaped wheel style rear brakes. they're a real pain to assemble compared to the 1200's. & they are supposed to self adjust by a linkage from the handbrake cable, but they never did.