Scheme for checking the wheel cylinders of the rear brakes
1 - piston stops; 2 – tested cylinder; 3 - cylinder bracket; 4 - low pressure manometer; 5 – high pressure manometer; 6 - cylinder for creating pressure; 7 - vessel; 8 - flywheel
1. Before checking, make sure that the parts of the working cylinder move freely in the cylinder.
2. Install the cylinder on the stand, attach the pipeline from the pressure gauges to it and bleed the system.
3. Adjust stops 1 so that the pistons are moved apart as far as possible.
4. Check for fluid leakage. Connect a low pressure gauge; slowly turning the flywheel for controlling the drive cylinder, set the fluid pressure to 0.05 MPa (0.5 kgf/cm2).
5. Ensure that the set pressure is maintained for 5 minutes.
6. Repeat the same test at a pressure of 0.1–0.2–0.3–0.4–0.5 MPa (1–2–3–4–5 kgf/cm2).
7. Reduce pressure and connect a high pressure gauge.
8. Following these rules, repeat the tests at a pressure of 5–10–15 MPa (50–100–150 kgf/cm2). Pressure reduction due to liquid leakage through sealing elements, pipeline connections, liquid pumping nozzles or through the pores of the casting is not allowed. Minor (no more than 0.5 MPa (5 kgf/cm2) within 5 minutes) reduction in pressure, especially at higher pressures, due to shrinkage of seals.