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).
Experimental Department weekly report detailing tests and issues with various components, focusing on brake vibration.
| Identifier | ExFiles\Box 1\6\ B001_X2 Double Rear Brakes-page082 | |
| Date | 16th December 1913 | |
| Mr Johnson. Mr Royce. Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}5/L161213. December 16th. 1913. EXPERIMENTAL DEPT. "B" Weekly Report. The following have been reported on :- Inverted Rear Springs with small number of thick plates. X.12 Front Springs with solid eyes on top. X.888 Bumping test of Frame with cross member fixed to both flange and web of frame. X.877. Pivot Pins with oil hole from end to end. X.907. Front Axle F.3391. X.23. X2 X.2 - Double Rear Brakes. Chassis 2300 which is fitted with double rear brakes has recently developed a habit of making a grunt or vibrating musical note just before the car is brought to rest by the application of the foot brake. The brakes are a most excellent bed and are very effectual in use at all speeds. I have had the brake covers off and watched the brakes when the noise is on and find that the brake brackets, drums etc. are trembling at a high speed. I think it likely that the vibration is started by the slight springing of the brake bracket and suggest that we make a rough pair of temporary brake brackets which would be more rigid; and being heavier would be less likely to vibrate rapidly. The grunt is worse when the brake is used when the car is moving slowly backwards. | ||