1955-59 CHEVY TRUCK FIREWALL MOUNT POWER BRAKE CONVERSION FIREWALL MOUNT POWER BRAKE BOOSTER KITS ARE DESIGNED TO ENHANCE YOUR DISC BRAKE SYSTEM AND MADE TO ALLOW EXTRA CLEARANCE OF VALVE COVER COMBINATIONS. A MUST WHEN RUNNING DISC BRAKES ON YOUR CHEVY OR GMC TRUCK. THIS KIT INCLUDES: � CHROME 8" DUAL DIAPHRAGM POWER BOOSTER � FIREWALL MOUNT WITH PEDAL ASSEMBLY � CHROME PROPORTIONING VALVE (DISC APPLICATIONS ONLY) � PROPORTIONING VALVE BRACKETS AND LINES (DISC APPLICATIONS ONLY) � MASTER CYLINDER � ALL MOUNTING HARDWARE