foot pressure applied to the brake pedal of the towing
j. Units of the Brakc Systcms.
The brake system consists of
cylinders, air chambers, emergency relay valve, emer-
gency air line, service air line, hydraulic tubes, air
M269. The brakc system con-
sists of the wheel brake mechanisms, slack adjusters,
brake air chambers, emergency relay valve, air reser-
voir, emergency air line, service air line, air filters, and
k. Wheel Brake Mechanisms.
(a) T h e w h e e l b r a k e m e c h a n i s m s , l o c a t e d w i t h i n t h e b r a k e
drums, are of the self-centering type. This type brake
assembly has two identical brake shoes and two iden-
The brake shoes
tical wheel cylinder assemblies.