From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Diagram and explanation of the Hispano-Suiza brake system.
| Identifier | WestWitteringFiles\K\December1923\ Scan50 | |
| Date | 7th December 1923 guessed | |
| DIAGM. OF HISPANO BRAKE SYSTEM. [Diagram Labels:] TO FRONT BRAKE TO REAR BRAKES F E B. D C. FREE WHEEL SERVO CAM. 4th. PULL FROM FOOT PEDAL A DIRECTION OF ROTATION OF DRUM. 1 SHOE SHOWN ONLY. ACTION. ENG. RUNNING :- 1. Depressing pedal expands brake shoes in servo by means of cam A.{Mr Adams} 2. Rotating drum C. running at 1/29th the eng. speed tends to drag shoes round with it, pulling by B - anchorage for shoes - with it. This pull is direct on to rear wheels thro' levers on shaft B. A shaft running thro' the servo & operating the two front brakes equaliser only equalises the pressure between the two front brakes. Consequently front brakes will not operate with rear brake cable removed & vice versa. BRAKING WHEN SERVO NOT IN OPERATION. I.E. PROP SHAFT NOT REVOLVING. FUNCTION OF FREEWHEEL. Depressing the pedal expands shoes until they press hold against servo drum, when shoes are locked solid. Therefore any additional movement will rotate drum and drive anchorage B. Operation will then be as before with no self-servo. In this case D is not moving & C is locked, & E freewheel provides for this movement as it does for the car running backwards. | ||