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 dimensions of servo-operated front and rear brakes for various car models.
| Identifier | ExFiles\Box 182\M19\ img091 | |
| Date | 4th December 1931 guessed | |
| DIMENSIONS OF SERVO OPERATED BRAKES TYPE FRONT BRAKES REAR BRAKES Arc of Contact of Each Brake Strap Arc of Contact of Each Brake Strap Length Angle Width of Shoe Dia. of Drum Length Angle Width of Shoe Dia. of Drum Silver Ghost & Phantom I 13.0" 99°* 1.70" 15.0" 17.8" 120° 2.00" 17.0" Phantom I (Later Series) 11.3"* 86°* 1.75" 15.0" 15.2" 109° 1.75" 16.0" Phantom II 14.0" 107° 1.75" 15.0" 15.2" 109° 1.75" 16.0" Phantom II (Later Series) 13.9" 106° 1.75" 15.0" 15.2" 109° 2.25" 16.0" Phantom II (Locomotive Type) 14.1" 108° 1.75" 15.0" - - 2.00" 14.0" 20HP 11.7" 103° 1.30" 13.0" 14.4 118° 2.00" 14.0" 20HP (Later Series) & 25HP 11.7" 103° 1.30" 13.0" 15.3 125° 2.00" 14.0" * INCREASES TO AN ADDITIONAL 30° & 23° RESPECTIVELY WITH WEAR. | ||