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).
Tests to ascertain how mud and water penetrate the front brake mechanism and how to prevent it.
| Identifier | ExFiles\Box 5\3\ 03-page213 | |
| Date | 1st February 1925 | |
| GOSHAWK 111. BRAKES. FRONT BRAKE DUST COVERS. In connection with troubles arising from mud and water penetrating into the front wheel brake mechanism, we have carried out a series of tests to ascertain how the mud gets in and to find the simplest means of excluding it. It is rather difficult to observe by watching how the mud is splashed on to the brake carrier. Mud appears to be splashed in an outward and upward direction from the point of contact of the wheel with the road and is then apparently blown on to the brake carrier by the wind eddies consequent upon the car passing through the air at a fairly high speed. When travelling slowly no mud is splashed directly on to the drums or carrier direct from the wheel. A certain amount of mud drops from the mud-wing on to the brake drum and brake carrier, but this is practically negligible at low speeds, and at high speeds this will probably be blown backwards away from the drum. Examination of the front brake mechanism after the car has been run through muddy roads, shows that mud penetrates as shown in the sketch. It is noticed that the mud enters the brake drum between the dust cover and the drum near the shoe actuating toggle and in gradually decreasing amounts, in a downward direction, on the front of the drum. The mud that has entered is then carried round by the drum and is deposited all over the brake linings and shoes. contd :- | ||