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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).
Methods for returning oil from actuating cylinders using engine vacuum.

Identifier  ExFiles\Box 179b\1\  img139
Date  2nd November 1932 guessed
  
(2)

As regards returning the oil from the actuating cyls. to the master cyl. chamber should this be found desirable, I suggest that we can use the vacuum of the engine, but I should only use this vacuum while the brakes were on. It would necessitate a system of pipes to the dampers, but they could be in series or in parallel by arranging a restriction and ventilating holes accordingly, that is, there need not be a separate pipe to each damper. The reason being the large capacity of the engine vacuum combined with the restriction would clear the oil out of the last one even though 3 were clear of oil. An alternate way of arranging it would be to put them all in series with a ventilating hole in the last. In this case small restrictions are not necessary. There would be a supplementary reservoir for such a sch. with a valve worked in unison with the master piston, as will be further explained by DA{Bernard Day - Chassis Design}'s notes.

R.{Sir Henry Royce}
  
  


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