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 features of the hydraulic shock dampers, frame, and braking system.
| Identifier | ExFiles\Box 139\3\ scan0170 | |
| Date | 3rd June 1938 | |
| -4- Hydraulic Shock Dampers. These are of patented Rolls-Royce design and manufacture, and as already mentioned the front units are incorporated in the spring housing. The degree of damping is automatically controlled by a patented governor device which controls the damper loading in accordance with the car speed. A special "over-riding" control is also fitted and is operated by a lever on top of the steering column to enable the loading of the shock dampers to be increased to the maximum, or to any intermediate setting at will. The inclusion of a stabilising torsion rod coupled to the shock damper arms makes for an even ride under all conditions. Frame. With box section side members, and specially braced for strength the 25/30 H.P. Wraith frame is the result of long experience on the part of Rolls-Royce Ltd. in frame construction and incorporates many advanced features which have proved of intrinsic value. Brakes. One of the most noteworthy points of the Rolls-Royce chassis is the system of brakes which is employed. A mechanical servo in the form of a friction disc clutch rotated by the transmission, and mounted on the side of the gearbox is used. When the brakes are applied the pedal pressure operates the rear shoes in the usual manner, and at the same time brings the servo into operation, thus applying the front brakes. The pull from the servo is distributed between the front and rear brakes by a special "T" shape balancing lever. A separate equaliser is provided for both pairs of front and rear brakes, to ensure even braking on both sides of the car. With this system positive, progressive braking is assured, with a light pedal pressure which gives passengers and driver alike, a feeling of complete confidence. The hand brake operates on the rear wheels, and is conveniently placed on the right of the driver, where it does not cause any obstruction. | ||