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).
Test report on brake drum water excluders, recommending Type 7 for production.
| Identifier | ExFiles\Box 84\2\ scan0282 | |
| Date | 30th January 1935 | |
| -3- Scheme 7 has been tested on the road. Driving through water splashes that do not submerge the drum, even fast, did not cause judders. Driving through a water splash 30 yards long, the water coming up to the hubs, did wet the drums but only very slightly, two brakings from 20 m.p.h. to stop being sufficient to dry the drums again. Type 7 appears to be the best and has been recommended for production. It does not depend for its efficiency on fine clearances, nor will it overheat the drums or prevent bedding in of the shoes. It is suitable for adoption to existing drums. In conclusion we would state that we do not claim perfection for this excluder, but consider it should eliminate complaints of wet judders and inefficient brakes after washing. Other water inlets to the drum are :- (1) The series of holes in the hub plate. (2) Badly made bifur joints in carrier plate. (1) should be reduced in number and size if possible. We have had a case of (2) where leakage occurred. We think that attention should be paid to this point. HM{Capt. W. Hallam - Head Repairs}/A.F.Martindale. | ||