IVECO: applies fully pneumatic braking system not only on heavy-duty vehicles but also on M range. When the whole circuit is pneumatic, drum brakes may have two systems of operation: cam or wedge.
Figure 3.4: Air-hydraulic actuated
Figure 3.5: Fully pneumatic brake system
3.1.6.4. Cam It has two shoes each pivoted at one end with a roller that rides on the cam at the other. When the brakes are applied to the cam, it rotates and the rollers move farther out on the cam radius and force the brake shoes against the rotating brake drum, slowing the 82