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 length, bleed the system.
3. Then close valves 1.
4. 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). 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 failure to maintain constant pressure for 5 seconds, replace the cylinder piston seals.