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).
Effect of uneven braking on steering in four-wheel brake systems and proposing a modification and test.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan28 | |
| Date | 1st January 1924 | |
| TO HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} FOUR WHEEL BRAKES. Xqanto Referring to the question of the steering being affected by one brake being on harder than the other, it appears that this should be the case apart from any question of the wheel being turned on the pivot. If there is severe braking on one wheel there is a couple with an arm equal to the distance between that wheel and the centre of gravity of the car tending to slew the car round. We suggest, as you no doubt have also considered, that the point that seems to offer most hope at the moment is proper compensation of the front brakes. It is of course impossible to compensate for difference in bedding except by a very elaborate scheme but we think that it is possible the actual pressure balancing may be improved. We have sent to Mr. Bailey a drawing (N.Sch.1731.) shewing a little modification to the cross shafts on the front axle which we think should improve the compensation. Could you make some measurements on the vertical pull rods with a view to ascertaining whether there is consistently more pressure on one side than on the other? It would appear to be quite simple to attach spring balances to these rods and measure the pressure, repeating it on a number of cars to see whether the results are consistent. It would also be interesting to see what the pressures are when the pressure on the pedal has been released a little. You will of course have noticed in this weeks 'Autocar' a man speaking of his experience with four wheel brakes emphasises that the tyre pressures should be equal, seeming to indicate that he had had somewhat similar trouble. DA.{Bernard Day - Chassis Design} [signature] | ||