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).
Front and rear brake performance, specifically investigating judder issues and potential solutions.
| Identifier | ExFiles\Box 83\4\ scan0228 | |
| Date | 27th May 1936 guessed | |
| ( 6 ) FRONT & REAR BRAKES. LOP GB.1236 LOP GB.854 NS{Norman Scott} 4772. Lined with Zinc bonded Ferodo. The brakes have not been up to standard throughout the mileage, considerable more load has been required on the foot pedal, compared with a standard Paris Bentley. The braking was approximately 20% less effective. A squeak developed from the O.S.R. drum. The inside ball race was found dry and brass cage scored. Re-greased and made free. The servo has been examined and it is as efficient as all on the road. A slight amount of scoring was taking place on the cam sleeve. The wear of the brakes is normal. FRONT Nearside Offside FULL TURNS 6 8.1/2 REAR Nearside Offside FULL TURNS 2.1/2 2.1/2 NEW REAR AXLE. 7 4.1/2 MARTINDALE With reference to judders. These have sometimes occurred at very awkward moments, and might result in very serious consequences if the car should happen to be in a customer's hands. There are many things that go to assist the possibility of this condition and we have been able, to a big extent, to stop this by carrying out simple precautions. The most important precaution is to see that the hand adjustment on the front drums is always up to the nearest notch, thereby reducing thumps which is one of the chief factors that start a judder. We are also aware that the nearer it is possible to have the servo 100% efficient, the less probability there is of a judder occurring. We have had a three pin servo on this car, which we know to be less efficient than the spring plate driven servo, this must have also contributed to a large extent towards the possibility of a judder. It has been suggested that the hand adjustment mechanism should be made of lighter material, so as to reduce the overhanging weight to the minimum, this may possibly eliminate the effect that this unit is producing. We have also found that well adjusted brake ropes i.e."ropes without slack" go a long way towards reducing judder. A severe judder invariably produces defects. We have found that the toggle levers that operate between the cam | ||