1949 Delco Brakes Service Manual (Courtesy of Pat Gizz)
	DELCO BRAKE SERVICE MANUAL
		Fig. 7—Styles of Check Valve became unseated and interferred with proper opera­tion of the check valve. The design was changed in 1938 as shown in Figure 8A and this new design has been used on all Master Cylinders since that time.
	Fig. 6—Pedal Clearance When the cylinder is installed on the car, be certain the pedal is adjusted properly to give approximately 1/2" clearance from the toe-board (See Figure 6). If the pedal is adjusted properly, fluid will spurt up through the port when several quick applications of the brake pedal are made. Check the stop light switch with a volt-meter. If defective, replace. Flush the system with Declene (See Figure 12) and refill with the recommended Delco Hydraulic Brake fluid. Do not fill fluid reservoir beyond the LOWER end of the Filler Plug. See Figure 2 for recom­mended fluid level. Never reclaim used fluid. Throw it away. Increased speeds and the use of boosters have led to more severe braking operations. Style "A" check valve, (See Figure 7), where the rubber insert seat­ed itself in the contour of the check valve was used successfully for many years. In 1942 the "collar button" type, Style "B," was introduced. In this style the rubber insert was buttoned in place. In 1949, Style "C" was manufactured for the first time. The rubber insert is firmly held in place by an inner retainer and is entirely surrounded with perforated metal as shown in Figure 7. Until 1938, the head nut and check valve seat washer shown in Figure 8B were used. There were a few cases of trouble in the field where the washer
		A                                                                                    ft Fig. 8—Styles of Headnut WHEEL CYLINDERS DETAILED DESCRIPTION AND OPERATION The Delco Wheel Cylinder (See Figure 9) is the unit that changes the hydraulic pressure produced in the master cylinder into mechanical force which is applied to the brake shoes. The introduction of fluid into the cylinder causes the two pistons to move in opposite directions thus forcing the shoes into contact with the brake drum. Pressure cannot be built up in the system until all brake shoes are in contact with the brake drums. WHEEL CYLINDERS DETAILED SERVICE INSTRUCTIONS To remove the front wheel cylinder: —Disconnect hose from copper tubing at the
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1949 Delco Brakes INDEX

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