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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).
Analysis of increased wear on rear brake drums following the introduction of servo-assisted, four-wheel brakes.

Identifier  ExFiles\Box 5\3\  03-page095
Date  29th November 1924 guessed
  
Contd :- -2-

seriously scored rear brake drum. But since we have had the servo, we find that scored brake drums are frequent.
The experimental experience is that with 4-wheel brakes, even when used under average conditions, wear on the rear brakes, is just as much, if not more, than when we had two brakes only.
We consider this is due to the fact that at high speeds, very much more braking effort can be applied with the servo without any apparent discomfort to the passengers.

Hs.{Lord Ernest Hives - Chair}
  
  


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