Bleeding the brake hydraulic system without special installation (Audi 80 B2)

When bleeding the brake system, monitor the presence of fluid in the reservoir, preventing its bottom from being exposed.

Before you start bleeding, eliminate the influence of the vacuum booster by pressing the brake pedal several times.

Remove air first from one circuit, then from the other, starting each time from the wheel furthest from the master cylinder, observing the following sequence: brake cylinders of the right rear, left rear, right front and left front wheels.

Add brake fluid to the reservoir to the normal level.

Remove the protective caps from the air outlet fittings. Clean the fittings from dust and dirt.

Place a transparent tube on the head of the brake nipple of the right rear wheel, and lower its free end into a container filled ⅓ with clean brake fluid. Press the brake pedal to create pressure in the brake gas system. If you do not feel resistance when you press the pedal, slowly and continuously press it until pressing it does not require any effort. Loosen the nipple by ½ a turn with the pedal pressed all the way. After this, the assistant should slowly press the brake pedal and slowly release it, while the liquid along with the air will be forced out of the system through the hose into the container. Repeat this process until bubbles stop coming out and clean liquid starts coming out of the hose, hold the pedal in the pressed position and tightly screw the nipple to release air. Remove the hose and put a protective cap on the nipple.

Repeat the operations for the other wheels.

After bleeding, restore the brake fluid level in the reservoir if necessary. Do not use fluid drained from the system to fill the reservoir, as it is saturated with air, contains a lot of moisture and may be contaminated.

[The text is based on materials from the website: AudiManual]