Hold Off Valve - GM
1970 GM A-body Chevelle / El Camino / Monte Carlo
GM Valve Notes:
This item is an exact reproduction
disc brake hold off valve. This valve was used to hold off pressure to the rear
brakes so the front brakes would go on a split second before. This was also
considered a correction valve for the 1970 model year. During extreme braking
conditions, this valve prevented the car from getting sideways and evened out
braking loads. This valve is located at the rear of the car, mounted to the back
cross member close to where the rubber brake hose attaches through the frame. In 1970, these cars had three valves that made up the disc brake system.
The valves include: above hold off valve, distribution block, and round golf
ball valve. In 1971, these three pieces were combined into one valve which
simplified the system.