Okla. Stat. tit. 47, § 47-12-608: Brakes on motorcycles

The brake system on any motorcycle shall comply with performance

ability standard set forth in 49 C.F.R., Section 571.121, and shall

be adequate to control the movement of the motorcycle and to stop

and hold the motorcycle, including two separate means of applying

the brakes. One means shall be effective to apply the brakes to the

front wheel, and one means shall be effective to apply the brakes to

the rear wheel or wheels.