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 specifications for servo-operated front and rear brakes on various car models.
| Identifier | ExFiles\Box 182\M19\ img092 | |
| Date | 4th December 1931 | |
| PARTICULARS OF SERVO OPERATED BRAKES TABLE DATA: TYPE OF CAR | FRONT BRAKES - TOTAL AREA OF FRICTION SURFACE | FRONT BRAKES - BRAKE AREA PER TON LOAD | FRONT BRAKES - FRICTION MATERIAL | REAR BRAKES - TOTAL AREA OF FRICTION SURFACE | REAR BRAKES - BRAKE AREA PER TON LOAD | REAR BRAKES - FRICTION MATERIAL --- | --- | --- | --- | --- | --- | --- Silver Ghost | 78.4 sq" | 66.6 sq" | FERODO | 142.8 sq" ++ | 110.0 sq" | FERODO Phantom I | 78.4 sq" * | 65.3 sq" | FERODO | 142.8 sq" + | 105.8 sq" | FERODO Phantom I (Later Series) | 69.6 sq" * | 58.0 sq" | FERODO | 94.4 sq" | 69.9 sq" | FERODO Phantom II | 85.7 sq" | 81.7 sq" | FEROBESTOS | 94.4 sq" | 69.9 sq" | FERODO Phantom II (Later Series) | 89.5 sq" | 85.3 sq" | FEROBESTOS | 129.3 sq" | 95.8 sq" | FEROBESTOS Phantom II (Locomotive Type) | 87.6 sq" | 83.5 sq" | FEROBESTOS & AMR.2. | - | - | - 20 H.P. | 53.6 sq" | 72.1 sq" | FERODO | 108.0 sq" | 115.2 sq" | FERODO 20 H.P. (Later Series) & 25 H.P. | 53.6 sq" | 72.1 sq" | FERODO | 115.2 sq" | 123.0 sq" | FERODO FOOTNOTES: * WILL INCREASE TO A FURTHER 18.0 sq" 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. STAMP: CHECKED 4.12.31 | ||