4-37. BLEEDING HYDRAULIC BRAKE SYSTEM (Cont).
Do not reuse brake fluid when refilling master
cylinder. Use only clean brake fluid to prevent
contamination of brake system.
Remove cap (4) and fill master cylinder (5) with
brake fluid in accordance with Chapter 3, Sec-
Loosen bleeder valve (1) 3/4 turn counterclockwise.
Do not pump master cylinder dry. Keep master
cylinder filled with brake fluid in accordance
with Chapter 3, Section I.
Air in hydraulic brake system will appear as
hubbies in brake fluid when expelled from tube.
Depress and hold towing vehicle brake pedal until
all air bubbles are expelled into jar.
Tighten bleeder valve (1) and release towing
vehicle brake pedal.
Remove bleeder tube (2) and repeat steps 1
through 6 for remaining wheel cylinders, replen-
ishing brake fluid in master cylinder (5) as
Install cap (4) on master cylinder (5).
Close towing vehicle shut-off valves and open air
reservoir draincock to release air pressure,