Checking the tightness of the rear sealing ring
Scheme for checking the condition of the rear sealing ring for leaks
1 – master cylinder; 2 – vessel; 3 – adapter with seal; 4 – pressure gauge; 5 – tee; 6 – adjusting screw; A – air from the compressor; B – air release
1. Mount the master cylinder on the stand, ensuring a good seal between the cylinder flange and the mating surface of the stand. Attach vessel 2 with hydraulic fluid to the cylinder. Open the compressed air valve with adjusting screw 6 unscrewed, then slowly close the adjusting screw until air comes out of vessel 2.
2. Check the air pressure using a pressure gauge; it should be within 0.05–0.08 MPa (0.5–0.8 kgf/cm²). If the pressure is lower, replace the rear sealing ring.
Checking the tightness of the front sealing ring
Scheme of checking the condition of the front sealing ring for tightness
(The text is copied from the online resource: VAZBOOK)
1 – bleed screw; 2 – tap; 3 – pressure gauge with a division value of 0.2 MPa (2 kgf/cm²); 4 – pressure gauge with a division value of 0.005 MPa (0.05 kgf/cm²); 5 – vessel; 6 – pusher; 7 – master cylinder
1. Install the master cylinder on the stand and connect it to a vessel filled with hydraulic fluid and to pressure gauges.
2. Close the pressure gauge valve 3 and, by moving the master cylinder pusher, ensure a stable pressure of 0.2 MPa (2 kgf/cm²).
3. With the plunger secured and no fluid leaking, the pressure should remain constant for 2 minutes.
4. Close the pressure gauge tap 4 and open the pressure gauge tap 3. By moving the pusher, set a stable pressure of 10 MPa on the pressure gauge (100 kgf/cm²).
5. With the pushrod secured and no fluid leaking, the specified pressure should remain constant for at least 2 minutes. Otherwise, replace the front sealing ring.