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 of the Hispano front wheel brake linkage system with an associated movement table.
| Identifier | ExFiles\Box 22\1\ Scan035 | |
| Date | 29th November 1923 guessed | |
| HISPANO FRONT WHEEL BRAKE LINKAGE, P, d, d1, d2, 4.305, 3.22, 2.56, 2.75, CABLE TO FRONT BRAKE., TO OPERATE CAM., SERVO., WHEN SERVO WORKING. MOMENT ABOUT THIS PT. IS INCREASED MORE THAN GIVEN LINKAGE SHOWN., PEDAL MOVEMENT, TABLE SHOWING MOVEMENT OF FRONT SHOE FOR MOVEMENT OF FOOT PEDAL., SHOE MOVEMENT (d2 - d1), PEDAL MOVEMENT, .03 | .5, .06 | 1.0, .10 | 1.5, .17 | 2.0, .23 | 2.5 --> BRAKING | ||