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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).
Ongoing work to solve 'brake jagger' issues on Bentley brakes.

Identifier  ExFiles\Box 85\1\  scan0055
Date  28th March 1936
  
To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}

x 206
Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}9/KW.28.3.36.

Bentley Brakes.

Replying to E.3/HP.26.3.36.

We are working continuously on brake jaggers but so far have not found any solution which is applicable to production which does not involve a reduction in the area of lining in contact with the drum.

At the moment we should like shoes to be detailed for the Bentley front brakes having 90° arc of embrace only, to be used with the standard drums and with the stiffer aluminium drums. It will be necessary to run 15,000 miles with these shoes because the increase in unit pressure may conceivably give rise to brake squeaks, etc. It is certain, however, that they will eliminate jaggers with the existing standard drum.

In the meantime we are continuing our efforts to find a solution that will deal with the problem without cutting down the friction lining, and also without calling for a complete redesign of the front brake operating gear. At the moment we cannot say that we see much prospects of success.


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


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