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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).
Final S.S. Brake Layout and lever lengths for a production chassis, including brake lining material options.

Identifier  ExFiles\Box 26\4\  Scan387
Date  1st May 1929
  
Y4385G
To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG1G. 5. 29.
c. to DA.{Bernard Day - Chassis Design}

S.S. BRAKE LAYOUT. Y7420

45º CAMS Halo cotton A.{Mr Adams} woven linings.
1.575
1.375
2.188
2.188

We have now got to the stage where we have sufficiently good brakes on our experimental cars to be able to make a recommendation for the first production chassis.

The above sketch shews the final lengths of levers we require. In effect it is exactly the same layout that was instructed for 13-EX. originally with the exception that the levers on the front brake equaliser shaft G.76646 have had their length increased from 1.750 to 2.188".

The servo is lined with Halo cotton A.{Mr Adams} woven discs a model of which we attach. The brakes will either be lined with the present standard Ferodo material or Ferobestos.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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