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 detailing the particulars of servo-operated brakes for various car models.
| Identifier | ExFiles\Box 12\5\ 05-page246 | |
| Date | 4th December 1930 | |
| 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. | ||