6.9.3. Check of wheel cylinders of back brakes at the stand

Fig. 6.28. Scheme of check of wheel cylinders of back brakes: 1 – emphasis of pistons; 2 – the tested cylinder; 3 – cylinder arm; 4 – manometer of low pressure; 5 – manometer of high pressure; 6 – the cylinder for creation of pressure; 7 – vessel; 8 – flywheel

Install the cylinder on the stand, attach to it the pipeline from manometers (fig. 6.28) and pump over system.
Adjust an emphasis 1 so that pistons of the wheel cylinder rested against them.
Check lack of leak of liquid. Connect the manometer 4 of low pressure and slowly rotating a flywheel 8, establish pressure of liquid of 0,05 MPas (0,5 kgfs/cm2) on the manometer.
Make sure that the established pressure keeps within 5 min. Repeat similar test with a pressure of 0,1-0,2-0,3-0,4-0,5 MPas (1–2–3–4–5 kgfs/cm2).
Reduce pressure and connect the manometer of high pressure. Following the specified rules, repeat test with a pressure of 5-10-15 MPas (50–100–150 kgfs/cm2).
Pressure decrease because of leak of liquid through sealing elements, connections of pipelines, unions for pumping of liquid or through a casting time is not allowed.
Reduction of pressure is allowed insignificant (no more than 0,5 MPas (5 kgfs/cm2) within 5 min.), especially, with more high pressures, because of shrinkage of sealants.