1942 - 1947 Chevrolet Shop Manual



	5-9



	Fig. 20—Checking Alignment of Brake Shoes with Flange Plate

	MAIN CYLINDER OVERHAUL Disassembly 1. Remove the end plug and valve seat washer. 2. Remove the valve seat washer from the button on the end plug. Fig. 23. 3. Remove the valve assembly and spring. 4. Remove the main cylinder boot.	5. Remove the pedal stop snap ring with a screw driver and remove the pedal stop and push rod assembly. 6. Remove the piston with the secondary cup. 7. Remove the primary cup. After all parts have been removed from the main cylinder, they should be washed in CLEAN ALCOHOL. Special care should be taken to make sure that the compensating port in the main cylinder housing, and the bleeder holes of the piston are clean. BEFORE WASHING PARTS. HANDS MUST BE CLEAN. DO NOT WASH HANDS IN GASOLINE OR OIL BEFORE CLEANING HYDRAULIC BRAKE CYLINDER PARTS, USE SOAP AND WATER TO CLEAN HANDS. Inspection Inspect the cylinder bore to make sure it is smooth. Inspect primary and secondary cups, valve and valve seat for damage or swelling. Replace when necessary. Swelling of the rubber parts is due to the use of improper brake fluid, or the washing of the parts in gasoline, or kerosene. NOTE—The primary cup of the main cylinder has a brass support ring vulcanized in its base to prevent the primary cup from imbedding in the bleeder holes during braking action. Check piston fit in the cylinder bore, Fig. 24. The clearance between the piston and wall of the cylinder should be from 1 to 5 thousandths of an inch.

	Fig. 21—Adjusting Rear Brake Toggle