Federal
Regulations

U.S. Federal regulations specify the adequacy and application of brake related systems and parts. Do not rely upon the data here to be current. Always check for the latest revisions, exceptions and for additional applicable regulations.

US Air Brake Regulations
What Is "121" Breakaway & Emergency Brakes (393.43) Required Brake Systems (393.40)
Complete 121
(571.121)
Brakes Required On All Wheels (393.42) Brake Tube & Hose, Adequacy (393.45)
Air Suspensions
(393.207 Section F)
Parking Brakes
(393.41)
Anti-Lock Brakes
(393.55)


Lighting Regulation Downloads
Lamps And Reflective Devices
(393.11)
Retroreflective Sheeting & Reflex Reflectors
(393.13),
Lamps & Reflectors On Driveaway/Towaway Operations (393.17)
Combining Lighting Devices & Reflectors.
(393.22)
Requirements For Lamps Other Than Head Lamps
(393.25)
Requirements For Reflex Reflectors.
(393.26)
Wiring Specifications
(393.27)
   

Canada Air Brake Regulations
Technical Standard Document # 121 Ontario SPIF Ontario FAQ