Master Cylinder Leak Test Scheme
1 – bleeding valve; 2 – pressure gauge; 3 – absorption cylinder; 4 – master cylinder; 5 – flywheel; 6 – pusher offset indicator; 7 – crane; 8 – vessel
1. Install the master cylinder on the stand and connect it to the stand elements as shown in the figure.
2. Open valves 1 to bleed the stand and, moving the master cylinder pistons several times to their full stroke, bleed the system. Then close valves 1.
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3. Rotating flywheel 5, slowly move the pistons of the master cylinder until the pressure monitored by pressure gauges 2 reaches 12.5 MPa (125 kgf/cm²).
4. In this position, lock the master cylinder pushrod. The specified pressure should remain constant for at least 5 sec.
5. In case of fluid leakage or decrease in constant pressure within 5 seconds, replace the cylinder piston seals.