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).
Technical bulletin regarding failures and modifications to the Phantom III front brakes.
| Identifier | ExFiles\Box 92\4\ scan0354 | |
| Date | 25th August 1937 | |
| To Hd.{Mr Hayward/Mr Huddy} (FOR DEPOT SHEET) c. to RHO. c. to By/TWD.{T. W. D???Aeith} 706 306 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}6/JH.25.8.37. Phantom III Front Brakes. Failures have occured on two cars of the front brake operating link G.83302. This is apparently due to the link being pressed against the side of the bell crank lever G.84118/9 in certain lock positions and also on bump. Although this ought not to happen if correctly assembled, should the sheet metal stops be distorted through repeated impacts a condition may be reached when the foul may occur. In order to prevent further accidents it has been decided to bring all cars up to the latest production standard at the earliest possible moment. The new parts to be fitted are listed in By/TWD.{T. W. D???Aeith}6/E.{Mr Elliott - Chief Engineer} 18.8.37. attached. The only difference between the assembly listed and production, is that the nuts holding the stops are not castellated but are secured by tab washers. The new nuts are stronger. When the above have been assembled before the brake drum is replaced or at the bell crank connected to the front brake equalizer, it is important that the brakes should be pulled on by the bell crank and allowed to fly off by releasing it, in both lock positions and straight ahead. The bell crank should easily touch the pivot cap, and no sign of stickyness or fouling should be present. The construction is sufficiently rigid to ensure that if it is correct when built up it will stay correct. The new bell crank lever gives additional front brake travel and reduces the chances of diving to one side on brake application, which was a complaint at one time. Will RHC.{R. H. Coverley - Production Engineer} please note the above instructions which apply to 342 cars, and arrange to supplies of material to be available. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||