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).
Table of braking test results for a four-wheel brake open touring car at various speeds.
| Identifier | ExFiles\Box 73\3\ scan0288 | |
| Date | 24th March 1925 | |
| FOUR WHEEL BRAKES. OPEN TOURING CAR. Wt. ratio Front .95 Rear 1.025 | | ALL WHEELS LOCK. | 40% BRAKING ON THE FRONT. | REAR BRAKES ONLY. | |---|---:|---:|---:|---:|---:|---:| | M.P.H. | Distance. | Time. | Distance. | Time. | Distance. | Time. | | 10 | 4.8 ft. | .625 secs. | 7 ft. | .96 scs. | 10.75 ft. | 1.46 secs. | | 20 | 19.2 " | 1.25 " | 28 " | 1.92 " | 42 " | 2.9 " | | 30 | 43.2 " | 1.875 " | 63 " | 2.88 " | 96 " | 4.4 " | | 40 | 77 " | 2.5 " | 112 " | 3.84 " | 168 " | 5.8 " | Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||