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).
Outlining four solutions for 'Brake Thud' and discussing brake leverage adjustments.
| Identifier | WestWitteringFiles\L\2July1924-September1924\ Scan40 | |
| Date | 9th September 1924 | |
| ORIGINAL TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} Copy to [strikethrough] R1/M12. 9. 24. re. BRAKE THUD. X9940 Mr. Bailey has the particulars that should help you to get this right. They consist of - (1) Some friction on 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 foot pressure which is increased. R.{Sir Henry Royce} | ||