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).
Instruction leaflet for fitting and hardening Chekko-W.G.2 self-hardening brake lining.
| Identifier | ExFiles\Box 141\1\ scan0157 | |
| Date | 1st May 1936 | |
| Chekko BRAKE AND CLUTCH LININGS LEAFLET No. 138 May, 1936. IMPORTANT GIVE THESE INSTRUCTIONS TO YOUR WORKS -:O:- CHEKKO—W.G.2 SELF HARDENING BRAKE LINING Instructions for fitting and bedding in quickly CHEKKO—W.G.2 is an entirely new form of Brake Lining. As supplied in a semi-flexible state the lining can be fixed to the shoes in the ordinary manner by rivets. It is not necessary, however, to bed this lining down by hand fitting or grinding on special jigs. Owing to the special chemical properties of Chekko—W.G.2, the effect of frictional heat first slightly softens this lining and continued frictional heat hardens the lining fairly quickly. The bedding down should be done, therefore, on the road test run, the brakes being applied against the engine for about half a mile, so as to heat the lining gradually and thoroughly. The vehicle should then be stopped and the maximum pressure applied whilst the wheels are stationary, allowing the lining to cool under maximum pressure. This process can be repeated if the feel of the brake is still “spongy.” If the above instructions are carried out, the lining will be found to have made a perfect surface, and when the brakes are readjusted, to take up the slight compression which takes place in the bedding process, the vehicle is ready for service. Care should be taken to warm up the lining gradually and to make the heating progressive until the drums are too hot to handle even with the tips of the fingers. It will be found that the hardening process continues for some considerable time, but after quite a short application, as described above, the brakes are quite fit for service. The hardening process may continue for 1,000 miles or so, dependent on the service, and when this process is complete the linings will be found to be almost as hard as moulded linings, but the frictional value will be considerably higher, and the lining will be found to be in contact all over the surface, so giving a very efficient brake. HEAD OFFICE & WORKS CRESSWELL'S ASBESTOS CO., LTD. WELLINGTON MILLS, BRADFORD. Phone: Bradford 950. Telegrams: CHEKKO, Bradford. BRANCH OFFICE: 25, WELLINGTON ST.{Capt. P. R. Strong} GLASGOW, C 2 Phone: Central 822 | ||