Master Cylinder Leak Test Diagram
1 - valve for pumping; 2 - manometer; 3 – absorbing cylinder; 4 - main cylinder; 5 - flywheel; 6 - pusher displacement 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, by moving the master cylinder pistons several times to their full stroke length, bleed the system. Then close valves 1.
3. Rotating the flywheel 5, slowly move the master cylinder pistons until the pressure controlled by the pressure gauges 2 reaches 12.5 MPa (125 kgf/cm2).
4. In this position, block the pusher of the master cylinder. The specified pressure must remain constant for at least 5 s.
5. In case of fluid leakage or loss of constant pressure within 5 seconds, replace the cylinder piston seals.