maximal FD100T - Vacuum Booster and Brake Master Cylinder; Vacuum Power Brake

5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
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5.3 Vacuum Power Brake
5-7t Vacuum power brake, namely vacuum booster with brake master cylinder assembly is
applied to the forklift trucks equipped with homemade engines, to achieve assist brake.
Vacuum degree (negative pressure) is utilized as power with vacuum booster (namely
utilization of pressure difference between vacuum pressure and atmospheric pressure), for the
operators to be able to achieve a relatively high brake wheel cylinder oil pressure, under the
action of a relatively light brake pedal force, to play a power-assisting and labor-saving
function, which has alleviated the driver’s labor intensity and enhanced the safety of wheel
brake.
Refer to Table 5-2 for main performance parameters.
Table 5-2
Name
Calculation
Unit
Numerical Value
Max ㎜ Φ263
Effective Diameter of Vacuum Cylinder
Min ㎜ Φ236
Max Stroke of Vacuum Booster ㎜ 39
Boost Ratio 7
Diameter ㎜ Φ31.75
Max Stroke ㎜ 38
Front-Cavity
Displacement
ml 15.8
Brake Master Cylinder
Rear-Cavity
Displacement
ml 14.2
Assembly Max Outer Diameter ㎜ Φ272
Size of Mounting Plate ㎜ 60×80,4-M8 Hole
Size of Oil Outlet ㎜ 2-M10×1
Deadweight ㎏ 5.3