1970-72 Olds 442 with W-30 performance package and standard transmission were only available with manual, not power, disc brakes. The engine didn't make enough vacuum because of the camshaft. The automatic had a different cam.
On my 55 and 56 Fords with performance camshafts about the only time the vacuum wipers worked was decelerating. Basically when you wanted the wipers to work you let off the gas.
Linear Mode
