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 an experimental car, noting issues with balance, servo judder, and pulling.
| Identifier | ExFiles\Box 69\2\ scan0070 | |
| Date | 19th May 1924 | |
| X8770 TO Hs.{Lord Ernest Hives - Chair} c. to BJ. FROM P.N. EXPERIMENTAL CAR. So far as brakes are concerned, I have not much of interest to criticise. Fortunately my second day's run was on a series of entirely slippery roads. I was able to note with some sorrow, that the rear wheels were getting more braking effect than do the front wheels. I understand, however, that this will probably be inevitable with the 40/50's. After running about 100 miles, I found a definite tendency for a high frequency jaggers, and my impression was that they arose from the Servo and not from either wheel. I found also that after running about that distance, the pressure on the foot pedal had to be somewhat greater to get any effect, than was the case earlier in the run, as if the surface of the Servo disc had become shiny or hard and suddenly took a grip. This effect, however, has entirely worn off again by this morning, when I could not re-produce it. Every time that the brakes were applied hard on a slippery road, there was a tendency for the front of the car to pull round to the offside, or to put it another way, for the rear of the car to bore to the nearside of the road. Is it likely that this was caused by one of the wheels on the offside being more tightly adjusted? Surely, the compensating devices would deal with this. P.N. | ||