The machine uses the principle of pressure or vacuum to perform non-destructive airtightness testing of the cylinders, and judges the sealing state of the cylinders according to the change of the air pressure value.
Operation steps for airtightness test of brake master cylinder:
1. Check whether the instrument is in good condition.
2. Place the master cylinder on the workbench and depress the pushrod pedal to push the master cylinder.
3. Place the vacuum plug close to the sealing ring of the oil cup and step on the vacuum pedal to make the value in the vacuum gauge between 0.04 and 0.08 MPA. (The vacuum plug should be close to the oil cup sealing ring to prevent air from leaking from here.)
4. Observe whether there is a drop in the vacuum gauge in 5 seconds. (There should be no drop in the pointer of the vacuum gauge within 5 seconds.)
5. Release the pushrod control pedal and observe the pointer of the vacuum gauge. (After the pushrod is released, the pointer of the vacuum gauge should return to below 0.03MPa within 2 seconds. If not, then the product is substandard.)
6. Repeat the above steps to detect the second cavity.
The operation steps of the airtightness test of the brake wheel cylinder and the clutch cylinder are almost the same as the brake master cylinder.