Bendix Commercial Vehicle Systems ACom Diagnostics V.6.7 - Manual (Page 33)

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P21 / P22 Delivery Test
The P21/P22 Delivery Test will check that the module is correctly plumbed to the brake chambers and test
the brake delivery air pressure. Park the vehicle on level ground and chock the wheels. During this test, the
delivery pressure should match the control pressure. After applying the brakes, the technician must verify
that the delivery and control pressures are the same. Bendix
® ACom ® Diagnostics system will then release
the brakes and the technician must verify that the brakes have released. The final step is for the Bendix
ACom Diagnostics software to re-apply the brakes.
Figure 36