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).
Specification table for front and rear servo-operated brakes on various car models.
| Identifier | ExFiles\Box 102\3\ scan0025 | |
| Date | 4th December 1930 | |
| PARTICULARS OF SERVO OPERATED BRAKES. TYPE OF CAR. FRONT BRAKES. TOTAL AREA OF FRICTION SURFACE | BRAKE AREA PER TON LOAD. | FRICTION MATERIAL REAR BRAKES. TOTAL AREA OF FRICTION SURFACE | BRAKE AREA PER TON LOAD | FRICTION MATERIAL SILVER GHOST | 78.4 □" * | 66.6 □" | FERODO | 142.8 □" † | 110.0 □" | FERODO PHANTOM I. | 78.4 □" * | 65.3 □" | FERODO | 142.8 □" † | 105.8 □" | FERODO PHANTOM I (LATER SERIES). | 69.6 □" * | 58.0 □" | FERODO | 94.4 □" | 69.9 □" | FERODO PHANTOM II | 85.7 □" | 81.7 □" | FEROBESTOS | 94.4 □" | 69.9 □" | FERODO PHANTOM II (LATER SERIES) | 89.5 □" | 85.3 □" | FEROBESTOS | 129.3 □" | 95.8 □" | FEROBESTOS PHANTOM II (LOCOMOTIVE TYPE). | 87.6 □" | 83.5 □" | FEROBESTOS & AMR.2. | — | — | — 20 H.P. | 53.6 □" | 72.1 □" | FERODO | 108.0 □" | 115.2 □" | FERODO 20 H.P. (LATER SERIES) & 25 H.P. | 53.6 □" | 72.1 □" | FERODO | 115.2 □" | 123.0 □" | FERODO * WILL INCREASE TO A FURTHER 18.0 □" AREA WITH WEAR, (OWING TO CHAMFER ON FABRIC). † INCLUDES AREA OF RIVET HEADS, (WHICH ARE IN CONTACT WITH DRUMS). NOTE: THE BRAKE AREA PER TON LOAD IS BASED ON THE WEIGHT OF AN AVERAGE COMPLETE CAR. | ||