BRAKE SYSTEM 501 BRAKES 3. Brakes Held ON : When the brake pedal is held on, the diaphragm will momentarily continue to move forward and thus compresses the outer edges of the reaction disc. This movement causes the centre of the disc to extrude, pressing back the input rod and thus closing the atmospheric port. Thus the output force is balanced against that of the input force. Further movement of the brake pedal either opens the vacuum port or the atmospheric port depending on whether the brake pedal is released or depressed. 4. Brakes Released Immediately after the brake pedal is released, the vacuum port is opened and the atmospheric pressure in the rear chamber is extracted into the front chamber and from there to the inlet manifold via the non-return valve. The atmospheric port remains closed whilst the input rod assembly returns to its original position as shown in figure. The diaphragm is then again ‘suspended’ in vacuum until the brake pedal is depressed.
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