1942 - 1947 Chevrolet Shop Manual



	5-16

	3. Line up the hydraulic main piston rod yoke with the hole in the power lever so the clevis pin will have a free fit. Install the clevis pin. Any necessary adjustment can be made by turning the yoke one way or another on the threads of the rod. 4. Line up the brake pedal rod yoke with the clevis pin hole in the valve operating lever, so the clevis pin will have a free fit. Then install the clevis pin. Any necessary adjustments to obtain correct alignments can be made by turning the yoke on the threads of the brake pedal rod, Fig. 37. 5. Loosen the valve operating lever adjusting screw locknut and push down slightly on the brake pedal so the over-diameter bushing in the valve links comes against the clevis pin. Then tighten the adjusting screw finger tight against the power lever and tighten the lock-nut, Fig. 38. CAUTION—Do not, under any circumstances, disassemble the power cylinder. If a vacuum test of the power cylinder still shows a leakage after the above operations have been performed, the cylinder should be removed and exchanged.	If a truck owner desires at any time to remove the Vacuum Power Brake Unit from one truck and install it on another, the unit should be serviced as instructed under "Maintenance."

		Fig. 38—Adjusting Valve Operating Lever Adjusting Screw

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