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Question:

Compared to s-cam brakes, wedge brakes and disc brakes are _________.

A Less common.
explanation

Wedge brakes and disc brakes are less common than s-cam brakes (according to CDL Handbook). While wedge brakes and disc brakes offer advantages in terms of efficiency and performance, they have not been as widely adopted as s-cam brakes in the commercial vehicle industry. S-cam brakes have been the traditional and more common braking system in use.

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