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).
The pressure and pull specifications for the Phantom braking system.
| Identifier | ExFiles\Box 13\1\ 01-page24 | |
| Date | 14th October 1932 | |
| GRY{Shadwell Grylls} X7360 HS{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} from GWH.{George W. Hancock - Head Chateauroux} 14.10.32. 25-EX. PHANTOM BRAKES. We have obtained the following particulars of the braking system. (1) Pounds pressure required to bring brake shoes in contact with drum. With servo working 11 lbs. With servo stationary 26 lbs. (2) Pounds pull required to bring on F.W.B. Pull taken on axle levers. O.S. 16 lbs. N.S. 19 lbs. Countershaft only O.S. 12 lbs. N.S. 13 lbs. Cam lever O.S. 3 lbs. N.S. 5 lbs. (3) Pounds pull required to bring on rear brakes O.S. 11 lbs. N.S. 11 lbs. (4) Pressure required to depress foot brake pedal only 5 - 7 lbs. HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} | ||