102
Pressing the brake pedal engages the first and the second circuits of the truck brake drive
as well as the third circuit of the trailer brake drive.
If one of the circuits is out of order, the rest remain efficient.
For the system diagnostics the check outlet valves are installed in each circuit.
Condensate drain valves are provided to service air bottles.
The brakes pneumatic drive units serve to create a compressed air reserve on the truck
and to actuate the brakes of the truck and of the trailer.
The schematic diagram of the brake drive without outlets to the 6
х
6 truck trailer is shown
in Fig. 83.
1-towing device; 2-oil separator; 3-two-pointer gauge; 4-pressure regulator with adsorber; 5-adsorber res-
ervoir; 6-four-line safety valve; 7-pressure drop sensor; 8-front axle brakes’ air reservoir; 9-rear bogie
brakes’ air reservoirs; 10, 13, 16, 19, 25-check outlet valves; 11-condensate drain cock; 12-spring brake
chambers with spring brake; 14,24-ABS modulators; 15-service brake acceleration valve; 17-parking brake
acceleration valve; 18-parking brake valve; 20-parking brake system cylinder; 21-return valve; 22-non-
brake consumers air reservoir; 23-brake chambers; 26-parking brake air valve; 27-engine stop pneumatic
cylinder; 28-brake valve; 29-brake actuation sensor; 30-compressor;
а
-to air-hydraulic booster (AHB)
Fig. 83 - Schematic diagram of the brake drive without outlets to the 6
х
6 truck trailer
The schematic diagram of the brake drive with outlets to the 4
х
4 truck trailer is shown in
Fig. 84.
