Figure 6-23. Rear brake wheel cylinder testing diagram:
1 - piston stops;
2 - test cylinder;
3 - cylinder bracket;
4 - low pressure gauge;
5 - high pressure gauge;
6 - cylinder for creating pressure;
7 - vessel;
8 - flywheel.
Adjust stops 1 so that the pistons of the wheel cylinder rest against them, check for fluid leaks. Connect low-pressure gauge 4. Slowly rotating flywheel 8, set the fluid pressure to 0.05 MPa on gauge 4 (0.5 kgf/cm).
Make sure that the set pressure is maintained for 5 min. Repeat a similar test at a liquid pressure of 0.1-0.2-0.3 -0.4-0.5 MPa (1-2-3-4-5 kgf/cm).
Reduce the pressure and connect the high pressure gauge 5. Make sure the pressure is maintained for 5 min, repeat the test at a liquid pressure of 5-10-15 MPa (50-100-150 kgf/cm²).
Pressure loss due to fluid leakage through sealing elements, pipe connections, bleed nipples or through casting pores is not permitted.
A slight decrease in pressure of no more than 0.5 MPa (5 kgf/cm²) over 5 minutes is allowed, especially at higher pressures, due to shrinkage of the seals.
(The article was reprinted from the website ChevyMan.ru)