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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).
Brake polishing issues and proposing tests with a new brake material and annealed brake drums.

Identifier  ExFiles\Box 32\2\  Scan026
Date  10th August 1921
  
R.R. 935c (to T.) (S.H. 988. 22/2/21.) Bm. 5988/5.
Hs.{Lord Ernest Hives - Chair} from BY.{R.W. Bailey - Chief Engineer}
X.3458
X2714
X3458
Stamp: BY2-P/10.8.21.
CHASSIS - REAR HUB & BRAKE.
Referring to Ph's remarks in regard to the brakes becoming more difficult to operate after a certain period of running, the actual facts of the case are, that both the drum and the Ferodo shoe take on a very high degree of polish. If this polish is destroyed by running the brakes hot the trouble disappears.
In regard to Ph's suggestion that the trouble was due to the brass wire becoming exposed and lying in some particular direction, I do not think that this actually affects the problem.
The new type material, of which we ordered 250 sets, containing no brass reinforcements, is available in the Store, and I think it would be advisable to try out definitely whether this material glazed similarly to the standard material under light braking effects.
A further experiment which I think should be carried out as well is, that we should anneal a pair of Brake Drums so as to leave them in a dead soft condition, as then the material would closely approximate to mild steel, which, in my opinion, it would be possible to use in conjunction with Ferodo facings.
BY.{R.W. Bailey - Chief Engineer}
By
  
  


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