188
ADJUSTMENT
E756 E757
BLEEDING THE TRACTOR BRAKE
SYSTEM
To bleed the tractor brake system, al-
ways proceed in the following order:
1. pressure air brake system for trailers
2. rear wheels service brakes
3. brake system of front driving axle
4. hydraulic brakes of trailer
Bleed the pressure air system for trailers
and rear wheel service brakes with brake
pedals unlatched, separately for each
wheel.
Bleed the brake system of front driving
axle and hydraulic brakes of trailer with
brake pedals latched.
During the bleeding watch the brake fluid
level in the equalizing tank to avoid suc-
tion of air into the system.
After each two years it is necessary to
replace the brake fluid in the entire brake
circuit.
Caution:
When bleeding the pressure air
system of trailers and rear wheel
brakes, it is always necessary to
depress one pedal (1) by 7,5
+0,5
mm when measured on the pis-
ton rod of the main brake cylin-
der, i.e. 3
+0,2
mm on the adjusting
screw (2) and to use the second
pedal for bleeding. To keep the
right distance, insert the flat
gauge of corresponding thick-
ness, i.e. 3
+0,2
mm, between
pedal (1) and adjusting screw (2).
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