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).
Blueprint showing brake layouts for the Phantom II and Spectre models.
| Identifier | ExFiles\Box 4\1\ 01-page166 | |
| Date | 16th November 1934 guessed | |
| BRAKE LAYOUTS. PHANTOM II SPECTRECodename for Phantom III PEDAL TO CAM 30:1 SERVO TO REAR 9:1 SERVO TO FRONT 12:1 CHAIN ON DRUM 12.575 4.75 STROKE .500 DIA 2.000 WEDGE X6 LIMITED TRAVEL 3.000 IN CASE OF HYDRAULIC FAILURE X6 STROKE 2.400 DIA 1.414 4" 8" 3" 2" | ||