Firebird V8-305 5.0L (1982)
Brake Proportioning/Combination Valve: Description and Operation
Brake Distribution Valve & Switch
Fig. 18 Brake distribution switch (normal)
Fig. 19 Brake distribution switch (failed)
Fig. 20 Typical brake distribution switch used in diagonally split brake systems
This switch assembly which is used on some diagonally split brake systems and Corvette four wheel disc brake systems, is connected to the outlet
ports of the master cylinder and also to the brake warning lamp that warns the driver if either the primary or secondary brake system has failed.
When hydraulic pressure is equal in both primary and secondary brake systems, the switch remains centered, Fig. 18. If pressure fails in one of the
systems, hydraulic pressure moves the piston toward the inoperative side, Fig. 19. The shoulder of the piston contacts the switch terminal, providing a
ground and lighting the warning lamp.
Fig. 20 shows a brake distribution valve and switch used on some diagonally split brake system applications.
