103
Emergency brake system
The functions of the emergency
brake system are performed by one of the
service brake system circuits. If one of the circuits is out of order, the emergency
brake system ensures braking the truck efficiently enough.
Parking brake system
The parking brake system is intended to fix the truck on slopes. The parking
brake control is mechanical. The brake is controlled by the lever located to the right
of the driver’s seat.
The parking brake is of drum type with two shoes and self
-
boosting.
When braking, the effort is transferred from adjusting lever 11 (Fig. 83)
through lever 10, shackle 12 to expansion lever 13.
When the brake drum rotates clockwise, the drive effort is transferred from
lever 13 via rod 1 to r.h. shoe 2. The shoe goes off the supporting pin and presses to
the brake drum. In so doing, the shoe, owing to friction, is caught by the drum,
shifted in the direction of rotation and via adjusting device 3 presses l.h. shoe 14 to
the supporting pin and drum.
When the brake drum rotates counter
-
clockwise, lever 13, resting on rod 1,
transfers the drive effort to l.h. shoe 14. The shoe goes off the supporting pin and is
pressed to the brake drum. The shoe, owing to friction, is caught by the drum, is
Fig. 83. Parking Brake:
1 – rod; 2, 14 – brake shoes
(l.h. and r.h.); 3 – adjusting
device; 4 – stopper; 5 –
sprocket; 6 – shaft; 7 – shield;
8 – lock nut; 9 – eccentric
pin; 10 – lever; 11 – adjusting
lever; 12 – shackle; 13 – ex-
pansion lever
