DCE80-100E
Technical Handbook
Brake system
Description
22
P.Group 70
TDCE01
04GB
Brakesystem – WDB-system
The foot brake system is known as the wet disc brake system, in
which each hub is equipped with a multiple-disc assembly.
The disc assembly comprises stationary discs arranged alter-
nately with a number of rotating discs. The disc assembly is com-
pressed by hydraulic pressure to provided effective braking
action. The assembly is submerged in a hydraulic fluid bath to
dissipate the heat generated by braking. A separate cooling cir-
cuit is provided to cool the hydraulic fluid.
The advantages of the wet disc brake system include the fact that
no adjustment is needed, and that no fading or wear occur. More-
over, the enclosed oil bath keeps the system completely free from
water and impurities.
The brake system comprises three separate hydraulic circuits,
i.e. the foot-brake circuit, the cooling circuit and the parking brake cir-
cuit.
All circuits are supplied with hydraulic fluid under pressure from
the same hydraulic pump. The brake circuits are supplied from
four hydraulic accumulators and the cooling circuit from the valve
block. Excess fluid from the main hydraulic system is passed on
to the cooling circuit.
Brake system, accumulator supply
21
22
42
31
32
40
39
38
34
41
35
52
21. Accumulator
22. Pressure limiting valve
31. Tank
32. Service brake valve
33. Service brake cylinder
34. Parking barke valve
35. Parking brake cylinder
36a. Brake cooling curcuit supply
36b. Brake cooling curcuit, return
38. Pressure switch, disengagement
39. Pressure switch brake lights
40. Pressure switch low brake pressure
41. Pressure switch warning lamp par-
king brake and seat buzzer.
42. Accumulator evacuating valve
52. Test outlet brake pressure
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