Pic. 6-21. Scheme for checking the wheel cylinders of the rear brakes:
1 - piston stops; 2 - tested 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 leakage. Connect a low pressure manometer 4. Slowly rotating the flywheel 8, set the pressure gauge 4 fluid pressure 0.05 MPa (0.5 kgf/cm2).
Ensure that the set pressure is maintained for 5 minutes. Repeat a similar test at a fluid pressure of 0.1-0.2-0.3-0.4-0.5 MPa (1-2-3-4-5 kgf/cm2).
Reduce pressure and connect high pressure manometer 5. Ensure that the pressure is maintained for 5 min, repeat the test at a liquid pressure of 5-10-15 MPa (50-100-150 kgf/cm2).
No reduction in pressure due to leakage of liquid through sealing elements, pipe connections, bleed fittings or through the pores of the casting is allowed.
A slight decrease in pressure is allowed (no more than 0.5 MPa (5 kgf/cm2) within 5 minutes, especially at higher pressures, due to shrinkage of the seals.