[1] As an updated version of the Pullin motor bicycle of 1919,[3] the Ascot-Pullin 500 overhead valve single was the first time hydraulic brakes were used on a motorcycle.

[3] Since 1920, Pullin had been working with Stanley Groom to develop and patent a two-stroke motorcycle with a unique design of pressed sheet metal frame and forks.

As well as the hydraulic brakes, Pullin also designed a telescopic centre stand and an adjustable windshield, complete with a windscreen wiper and rear-view mirror, as well as a fully enclosed chain and interchangeable wheels.

[1][2] Pullin's influence can be seen in the emergence of the Ariel Leader and the Vincent Black Prince thirty years later, which both developed the enclosed concept in an attempt to attract a wider range of customers.

At present, the U.S. National Highway Traffic Safety Administration recognizes that the first hydraulic brakes on motorcycles occurred in 1952.