Before removing air, it is necessary to wipe off dirt and foreign particles from the locations of the air removal fittings and the filler neck. If air is removed from the entire system, then it is necessary to start from the point furthest from the tank. If only one wheel cylinder or caliper was disconnected, it is sufficient to bleed the air from the circuit to which the specified element belongs.
In auto repair shops, air is removed from the brake system using a special device under pressure. The use of this device is not described here. A well-known method is described here, which consists of manually unscrewing the air bleed nipple.
1. Remove the protective cap from the corresponding air bleed nipple and place a transparent hose over it.
2. Place the other end of the hose into a container filled with some brake fluid.
3. Ask an assistant to press the brake pedal several times, pressing it to the floor.
4. Loosen the air bleed nipple half a turn when the pedal is close to the floor. The brake fluid will flow through the clear hose into the container.
5. As soon as the assistant says that the pedal is pressed to the floor, close the valve and slowly release the pedal.
6. Check and add fluid to the reservoir if necessary.
7. Repeat the above procedure until the liquid flowing into the container does not contain air bubbles.
8. Repeat the same on the other fittings in the indicated sequence. It is necessary to carefully monitor the fluid level in the tank. Reducing it below a certain level can lead to air being sucked into the system, which will require its removal again.
A few words about brake fluid. The brake fluid recommended by Opel should be used. Never use fluid that has been left unsealed for a long time. Brake fluid absorbs moisture.
Brake fluid contains some harmful substances that can harm human skin. If brake fluid comes into contact with your skin, wash the area immediately. If the liquid splashes into your eye, you should immediately consult a doctor. Brake fluid has a destructive effect on paintwork.
Replacing brake fluid
Please also contact Chapter 1.
For cars of the previous series, i.e. manufactured before mid-1995, the brake fluid should be changed once a year or every 15,000 km, depending on the intensity of use. New models of cars with rear disc brakes require replacement of brake fluid once every 2 years. However, for these cars the fluid level in the reservoir should be checked every 15,000 km.
Checking the tightness of the brake system
To check the tightness of the brake system, it must be held under pressure for 10 minutes.
Since holding the brake pedal for the specified time is quite a labor-intensive job, there is a special device for pressing the pedal.
It is inserted between the brake pedal and the seat frame as shown in the illustration. If after the specified time the device is still jammed, this indicates that there is pressure in the system. If the pressure drops, the device will also drop. In this case, you need to look for a leak in the system, a sign of which is brake fluid stains.
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