1970-72 GM Factory Disc or Drum Brake Distribution Block. Applications: 1970-72 Chevelle / Elcamino 1970-72 Buick - Skylark GS 1970-72 Oldsmobile - Cutlass / 442 1970-72 Pontiac - GTO / Lemans / Tempest 1970, 1971, 1972, ( Chevelle / Elcamino, Pontiac GTO / Oldsmobile Cutlass 442 / Buick Skylark GS) distribution block: This block was used on all cars, either disc or drum, and is located down on the frame below the master cylinder. This is not a proportioning valve because it does not proportion pressure.
