Before removing the air, it is necessary to wipe the location of the fittings for removing air and the filler neck from dirt and foreign particles. If air is removed from the entire system, then you need to start from the point furthest from the tank. If only one wheel cylinder or caliper was disconnected, it is enough to remove air from the circuit to which the specified element belongs.
In car workshops, the air from the brake system is removed by a special device under pressure. The use of this device is not described here. A well-known method is described here, which consists in manually unscrewing the bleed valve.
1. Remove the protective cap from the respective bleeder port and fit a transparent hose onto it.
2. Lower 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 bleed screw half a turn while the pedal is close to the floor. The brake fluid will flow through the transparent hose into the container.
5. As soon as the assistant says that the pedal is pressed to the floor, close the fitting and slowly release the pedal.
6. Check and, if necessary, add fluid to the tank.
7. Repeat the above procedure until the liquid flowing into the container does not contain air bubbles.
8. Repeat the same on other fittings in the specified sequence. It is necessary to carefully monitor the level of liquid in the tank. Reducing it below a certain level can lead to air being sucked into the system, which will require it to be removed again.
A few words about brake fluid. Brake fluid recommended by Opel should be used. Never use liquid that has been left open for a long time. Brake fluid sucks in moisture.
Brake fluid contains some harmful substances that can harm human skin. If brake fluid comes in contact with your skin, wash the area immediately. If liquid splashes into the eye, seek medical attention immediately. Brake fluid has a damaging effect on paintwork.
Brake Fluid Replacement
Please also contact Chapter 1.
For a car of the previous series, i.e. until the middle of 1995, the brake fluid should be changed once a year or every 15,000 km, depending on the intensity of use. New car models with rear disc brakes require brake fluid change every 2 years. However, for these vehicles, the fluid level in the reservoir must 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 a rather laborious work, there is a special device for pressing the pedal.
It is inserted between the brake pedal and the seat frame as shown in illustration. If after the specified time the device is still clamped, then this indicates the presence of pressure in the system. If the pressure drops, the fixture will also drop. In this case, you need to look for a leak in the system, a sign of which are brake fluid stains.
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