Figure 34-25. Tandem-Type Booster.

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Figure 34-24. Power Booster and Operation.

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 34-27. Bellows-Type Booster.

TM 9-8000

exerts a steady amount of pressure on the master

cylinder piston.

34-33. Tandem Booster. The tandem booster (fig. 34-

25) makes use of dual diaphragm plates to increase the

apply pressure to the master cylinder piston assembly.

This is used for heavy-duty application on some larger

vehicles.

34-34. Piston Booster. The piston-type booster (fig. 34-

26) uses a sliding piston assembly fitted to the outer shell

of the booster. The piston is provided with seals to assist

in airtight operation.

34-35. Bellows Booster. The bellows-type booster

(fig. 34-27) works by an expanding and contracting

bellows. The booster usually is mounted above the brake

pedal pivot point and acts against the brake pedal itself,

rather than the master cylinder.

34-36. Brake-Pedal Booster. The brake-pedal booster

Figure 34-26. Piston-Type Booster.

(fig. 34-28) is configured the same way

Figure 34-25. Tandem-Type Booster.

34-31