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).
Brake performance, specifically vibrations and the car's tendency to deviate upon braking.
| Identifier | ExFiles\Box 69\2\ scan0072 | |
| Date | 20th May 1924 | |
| To PN.{Mr Northey} from Hs.{Lord Ernest Hives - Chair} c. to BJ. X8770 SECRET. Hsl/LG20.5.24. RE. ADOPTED SCHEME OF BRAKES. It would be very helpful if you would amplify your criticisms on the brakes. We have tested the car since it has returned and we cannot find any sign of high frequency jaggers from the servo. We have demonstrated to you the jaggers we get from the front brakes - these you will remember, cause an alarming noise and vibration. Does the jagger you experienced compare in any way with that? As regards the tendency for the car to deviate from the straight course when the brakes are applied hard on a greasy road. It is all a question of degree, but we do not expect that the production cars will be any better than the car you tried, in this respect. It is not likely to be caused by the brakes on one of the wheels being tightly adjusted. On the adopted scheme of brakes, the braking effort is equalised on all brakes. If one brake was adjusted more closely, it would still have the same braking effort. Although we equalise the braking effort to allfour brakes, we cannot equalise the braking effect, for instance, if one brake had any oil on it or was for any other reason less efficient than the others, there would be less braking effect from that wheel although the same braking effort was going to it. If there is a smooth tyre on one wheel, the braking effect will be less on that one wheel. COY | ||