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).
Effects of suspension arm friction on front and rear brake operation.
| Identifier | ExFiles\Box 66\5\ scan0123 | |
| Date | 17th October 1927 guessed | |
| - 3 - (3) EFFECT OF SUSPENSION ARM FRICTION ON OPERATION OF FRONT AND REAR BRAKES: Maintenance reports that much friction in the suspension arm causes the rear brakes to engage first and the front brakes some time later. This will be so only if there is larger clearance in the front brakes than in the rear so that the arm swings back in the engaged position. If there is larger clearance in the rear brakes than in the front, much friction on the arm will cause the servo action to be applied to the front brakes first and then to the rear, since the arm will have to swing forward in the engaged position. (4) On the whole therefore, we can conclude that moderate friction on the suspension arm (15 lbs. on lower end) seems advisable. This is useful simply to avoid the grabbing and roaring which used to occur when the brakes were applied suddenly. The front brake-ropes should have a spring tension of 20 - 25 lbs. to guarantee brakes coming off under ice-conditions. This will also avoid the effect of the pedal applying the front brakes when the car is stationary (due to the cross-winding effect of the cam-levers.) All parts of the operating gear must be free and lubricated. OY Maurice Olley MO/R Sketches enclosed | ||