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 brake performance of the 19-G-IV model after 15,000 miles, discussing potential causes for inefficiency.
| Identifier | ExFiles\Box 102\3\ scan0047 | |
| Date | 6th November 1931 | |
| Copies x5860. Hs.{Lord Ernest Hives - Chair} from Mx.{John H Maddocks - Chief Proving Officer} Mx.{John H Maddocks - Chief Proving Officer}10/T.6.11.31. REPORT ON 19-G-IV - 15,000 MILES. x5840. BRAKES. We do not quite agree with Hancocks remarks on this subject which have lead to Sg{Arthur F. Sidgreaves - MD}'s comments Sgl/WT.5.11.31. We consider it would be undesirable to increase the front wheel braking on the 20/25 HP Chassis. Is it not probable that the comparative general inefficiency of the brakes on this car and the high proportion of braking effect and consequent wear and tear on the back brakes were due to the servo being inefficient. We would like to take this opportunity of stating that the efficiency of the 20/25 HP as distinct from the Phantom II is very easily impaired by the slightest trace of oil or grease on the friction surfaces, and if this occurs we have not found it an easy matter to remove the effects of grease particularly on the cotton duck, in fact, the only effective way is to replace the latter. Mx.{John H Maddocks - Chief Proving Officer} | ||