UAZ -374195 Operation Manual page 95

If air comes into the brake system of the ABS-equipped vehicle,
contact a service station. It is forbidden to operate the vehicle until the
malfunction is eliminated.
1. Bleed successively the chambers of the right and left rear brakes
wheel cylinders, the front circuit of the proportioning valve (for non-ABS
vehicles), and then the right and the left front brakes wheel cylinders.
2. Uncap the bypass valve of the wheel cylinder and put a special
rubber hose (approximately 400 mm long) on the valve.
Drop the other end of the hose into a transparent vessel no less than
0.5 l in capacity, which is half-filled with the brake fluid.
3. Press the brake pedal 3–5 times abruptly, hold it in the extreme
position and simultaneously unscrew the bypass valve for 1/2–3/4 of a
turn to release a fluid portion from the system into the valve. Screw the
bypass valve while pressing the brake pedal.
Repeat this step until bubbles stop coming out from the hose, dropped
into the vessel with the brake fluid.
4. As bleeding is over, screw the bypass valve and remove the hose.
Dry the valve head and put on the safety cap.
Add the brake fluid up to the MAX mark into the master cylinder tank.
Cover the tank carefully to avoid breaking the cap.
While bleeding hold the hose end dropped into the fluid.
Check the brake system when driving the vehicle. If the working
brakes and their drives are adjusted correctly and the brake system is
properly bled, full braking occurs within 1/2–2/3 of the pedal travel.
It is forbidden to add the brake fluid, collected in the vessel after
bleeding, to the master cylinder tank.
Do not press the brake pedal when at least one drum is removed, as
the compressed fluid will press the pistons out of the wheel cylinders
and the fluid will escape.
For the brakes to work properly (especially those with ABs),
change the brake fluid once every two years. Follow the rules of
filling the brake system with the fluid, until the fresh fluid will come
out from the hose.
The parking brake is maintained as follows: periodically check
the brake (Fig. 9.33) and its drive, adjust the lever travel, check the
attachments, clean and grease the parts of release and adjusting mechanisms
and eliminate any detected malfunctions.
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