Bleeding the brake system with a special tool
1, 2 - Rear brake calipers
3, 4 - Front brake calipers
After the brake system was repaired, during which its hydraulic path was opened, air can enter the latter, which must then be completely removed. A sign of the presence of air in the working circuits of the brake system is the softness of the brake pedal.
Note. If air enters the system as a result of a violation of its tightness, the cause of the malfunction must first be eliminated.
If air gets into a single wheel cylinder, it is enough to bleed only the corresponding caliper. If air enters the system tract as a result of an excessive drop in the liquid level in the GTZ tank, as well as after removing / installing the latter, the entire system is pumped. This also applies to the case of performing maintenance procedures requiring the dismantling of the hydraulic modulator.
The removal of air from the hydraulic path of the brake system is carried out using a special device, the connection of which must be carried out in strict accordance with the instructions of the manufacturers - the procedure should be entrusted to car service specialists.
Note. The pumping pressure is 2 atm.