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).
Summary of quarterly complaints and investigations into various brake-related issues.
| Identifier | Morton\M9\ img031 | |
| Date | 28th July 1931 | |
| To R.{Sir Henry Royce} From GWH.{George W. Hancock - Head Chateauroux} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} FILING RH.{R. Hollingworth} QUARTERLY COMPLAINTS. 84117 Item No.1. BRAKES. Front brake squeaks. We have tried experimentally every well known brake lining and with no exception are they free from squeaks. We do not at the present time know of any other cure other than the fitting of the pilot shoe. George's own patent only which remained effective only for a limited mileage Rear brake groans. We have carried out extensive research work with this complaint, and at the present time have not obtained a satisfactory production cure. We have issued a report covering the tests carried out. Rear brake actuating shaft seizures. We are at the moment testing out a redesigned lubrication scheme for the rear brake operating shafts. The scheme brings in a bijur supply to each shaft, with modifications to the oil conduits instead of as at present, one bijur supply to the two shafts. We have in the meantime instructed that these shafts shall be filled with oil when erected, as we found that although the bijur supply was working, the shafts seized before the oil had reached the end bearing. Front brake actuating shaft seizures. We are carrying out tests with a self lubricating bearing in the outer carrier plate to overcome this trouble. Front brake thumps. It should not be necessary to rebed the brakes to overcome this complaint. Attention to the servo, swinging arm and adjustment to front brakes should be sufficient. An inefficient servo and to much travel to the front brakes is the chief cause. We are trying out a new material for the servo, to try and improve the consistency of same. Inefficiency of brakes. The fitting of the broad shoe to the rear brakes on present standard cars, and Ferodo bonded asbestos linings to the front, should overcome these complaints. | ||