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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).
The causes and potential cures for squeaking brakes.

Identifier  ExFiles\Box 5\3\  03-page113
Date  17th April 1925
  
R.R. 493a (500) D.B. 175 29-9-24) J.B.D.

EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG17.4.25.

all forms of bedding and although rebedding the brakes will
always get rid of squeaks for a time, the cure is not permanent.

We have consulted Messrs. Ferodo on the question of
squeaking brakes and they do not know of any permanent cure.
In a number of cases they have recommended dampers on the
(handwritten: on big) brake drums. They have had difficulty with squeaking on all
brakes used in mines etc. They are of the opinion that
reducing the pressure per unit area will reduce the squeaks.
This, however, is not confirmed by our experience on a car
because we are running a 20 HP. car with the wider brake shoes
on the foot front brake - these brakes still squeak objectionably.
It is difficult to say whether they may not be slightly better
than standard.

We also get squeaking with quite light pressures on
the foot brake pedal.

The present dampers fitted to the 20 HP. cars are
very efficient. They effectively damp out a considerable
amount of squeaking; without them the squeaking would be
impossible. For their weight they are the most efficient
dampers we have tested. The damping schemes which the
Expl: Dept: have tried have always been with the object of
reducing the troubles on cars already in customers hands which
are being complained of by the owners. The following
experiments have been made :-

contd :-
  
  


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