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).
Four points of action and further explanation regarding a brake thud issue.
| Identifier | ExFiles\Box 73\3\ scan0201 | |
| Date | 2nd September 1924 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. x.9940 RL/M12.9.24. RE. BRAKE THUD. X.9940. Mr. Bailey has the particulars that should help you to get this right. They consist of - (1) Some friction an upper joint of suspension link to keep this steady. (2) More equal pull off springs. (3) Alter centre of suspension of floating lever, so no movement required, if movement of brake ropes are unequal. (4) Should not ease off end of brake shoe because this will reduce braking until bedding restored by wear. I understand leverage to front and rear is equal, clearances equal, travel of brake ropes equal, but servo reduced by larger cam so as to reduce braking all round, but proportionately greater reduction in front because this has no direct/pressure which is increased. R.{Sir Henry Royce} | ||