Section 26458.5 Of Article 2. Operation Of Brakes From California Vehicle Code >> Division 12. >> Chapter 3. >> Article 2.
26458.5
. Pursuant to Section 26458, whenever a motor vehicle is
equipped with an additional control to operate the brakes on a
trailer, that control shall not be used in lieu of the service brake
control, except in the case of failure of the service brake system.