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).
Comparison table of different front wheel brake schemes.
| Identifier | ExFiles\Box 73\3\ scan0012 | |
| Date | 29th April 1924 | |
| FRONT WHEEL BRAKE SCHEMES COMPARED. | SCHEME. | Servo speed. | Servo ratio Torque out / Torque in | Direct braking without servo assistance. | Total braking. | Torque to servo from pedal. | Max. dist car will travel before servo assists. | Remarks on servo assistance. | |---|---|---|---|---|---|---|---| | Hispano. | 1/29 | 7 | 5.1 P | 35 P | 12.8 P | 1.5 ft. | Lag in servo assistance will not increase with wear. | | RRM. | 1/10 | 2.45 | 9.7 P | 32.3 P front / 22.7 P rear | 6 P | 1.6 ft. with normal brake adj. .023 clce. between shoes and drum. | Lag will increase with wear on brakes. | | 'Agreed' E.H. | 1/30 | 2.45 | 9.3 P front / 8.7 P back. | 22.8 P back / 21.4 P front | 6.9 | 2.5 ft. | Will not increase with wear. | | M.{Mr Moon / Mr Moore} DES. 60 | 1/7 | 2.45 | 8.9 P front / 6.7 P back. | 31.4 P front / 23.7 P back | 6.6 P | 1.05 ft. | Will increase with wear. | | ||