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).
Technical report on front and rear brake issues and proposed solutions.
| Identifier | ExFiles\Box 84\2\ scan0226 | |
| Date | 17th December 1934 | |
| -4- (4) Front Brake Thumps. Existing Cars. This is always susceptible to the adjustment of the swinging arm, and to a lesser extent to the bedding of the front brakes. Future Cars. We have a scheme for direct braking to all four wheels. We think, however, that there is too much flexibility in our existing braking system to make direct braking to all four wheels possible without a considerable amount of design alteration. A smaller modification which would be of immediate benefit is increasing the area of friction surface on the swinging arm to make this operation more consistent, and to enable more load to be obtained at this point. In conjunction with this it would be necessary to increase the strength of the front pull off springs. At present there is not very much room to do this. An efficient servo reduces the tendency to brake thumps, we have a number of modifications on test which improve the efficiency of the servo and which will be standardised when they have completed 10,000 miles. (5) Oil on the Rear Brakes. Existing Cars. We have a scheme which can be applied to existing cars whereby a leather seal ring is fitted to the axle shaft. As far as we know at present this seems likely to be a cure. Future Cars. The same scheme. (6) Inefficiency of the Brakes for a few moments after the car has been washed. Existing Cars. Ferodo Bonded Asbestos is slightly better in this respect than Ferodo M.R. and has been fitted in cases of complaint. It can be fitted in the future in cases of complaint, as we now know that in service the Bentley brakes are wearing so well that they will have adequate life with Ferodo Bonded Asbestos. | ||