New master cylinder available from AP Racing


AP Racing, has developed the CP5898, a new differential bore master cylinder, which enhances performance in racing applications. The cylinder is already in use in the NASCAR Sprint Cup Series, and will be available to other categories, such as F1, sportscars, touring cars and rallying in due course.

Its advanced design improves braking consistency by reducing unwanted, low pressure, pedal travel and operating at high pressure throughout brake actuation.

Low-pressure pedal travel is minimized thanks to the use of two bores connected by the same piston, with an external valve controlling the changeover between the two. The larger bore controls the initial brake travel by supplying a greater volume of fluid at lower pedal pressures, which eliminates any losses in the brake system. As the braking pressure in the system rises, the external valve switches from the larger to the smaller bore at a predetermined pressure level.

This allows the high-pressure side of the master cylinder to operate for the remainder of the brake actuation. Once pressurized the system continues to operate on the smaller bore without the external value switching in and out, allowing progressive braking.


About Author


Alasdair joined the team in 2015 and works across a number of titles and websites for UKi Media & Events. He has been a journalist for 10 years, covering everything from travel and technology to sport and entertainment, and brings a wealth of experience, and pedantry, to the team. Away from the office, he is a celebrated snood connoisseur, determined to cycle no matter what the weather decides to hurl from the sky, and driven by a quest to find the very finest, and more importantly the next, slice of cheesecake.

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