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).
Meeting minutes discussing brake pedal travel, brake shoe testing, and servo troubles leading to brake inefficiency.
| Identifier | ExFiles\Box 30\2\ Scan309 | |
| Date | 22th September 1933 | |
| (Cont'd) Minute 1. -3- Rm.{William Robotham - Chief Engineer} also stated:- It had been found that some pedal travel is lost through the Star Spring on the Servo having departed from the drawing. A Depot Sheet is about to be circulated saying how this defect can be remedied and the pedal motion restored; ¾" of pedal movement can be regained by carrying out the suggested modification which consists of fitting a washer between the Star springs. Rm{William Robotham - Chief Engineer}: would like Br.{T. E. Bellringer - Repair Manager} to measure up the clearances and give the numbers of the cars on which there are complaints to prove whether the shoes have grown. Br.{T. E. Bellringer - Repair Manager} in reply to Hy.{Tom Haldenby - Plant Engineer} stated that we do not replace shoes when a seizure takes place, only the liners. Rm.{William Robotham - Chief Engineer} will put in hand tests of a brake shoe to observe any permanent distortion or growth due to heat. E.{Mr Elliott - Chief Engineer} stated that there is no past evidence of the same brake seizing up a second time after being re-lined and it is for this reason that temperature tests are to be made on a brake shoe. H.{Arthur M. Hanbury - Head Complaints} enquired if any progress had been made with steel shoes. Rm.{William Robotham - Chief Engineer} reported that only 5000 miles have been run with these and therefore nothing definite can be said about them at the moment. 2. The second item discussed was:- Servo troubles and brake inefficiency (4th item in H's note.) H.{Arthur M. Hanbury - Head Complaints} said Sales thought this matter needed quite a lot of attention. Hy.{Tom Haldenby - Plant Engineer} read the following shown on page 2 of H1/AL.18.9.33.:- "In connection with servo troubles such as jagging and grabbing it is also necessary to include the brake inefficiency cases due to servo which figure on the quarterly return. Taking these together there were 153 cases last quarter. It is considered that the servo is too susceptible to trouble, grease, moisture and even fumes affect it, and the R.A.D.13 Fabric cannot be said to have got over troubles as anticipated. F.O.C. attention which nearly always takes the form of re-lining, is being done, even | ||