Girling were British brake makers. According to wiki:
"The company started as a car brake manufacturer after, in 1925, Albert H. Girling (also co-founder of Franks-Girling Universal Postage) patented a wedge actuated braking system. In 1929 he sold the patent rights to the New Hudson company. Girling later developed disc brakes, which were successful on racing cars from the early 1950s to the 1970s.[7] Girling brakes had the quirk of using natural rubber (later nitrile) seals, which caused difficulties for some American owners of British cars because of incompatibility with US brake fluids.
Girling brake manufacture was taken over by Lucas in 1938, but the patent remained held by New Hudson until this in turn was purchased by Lucas in 1943. Lucas then moved their Bendix brake and Luvax shock absorber interests into a new division which became Girling Ltd."