NANO

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.