If you understand how the ABS system works on Tractor Trailer units it makes it a lot easier to find and fix faults.
***I mentioned in the video that I thought the blink codes were the same from bendix to wabco, they are not the same. The links below will give you the proper blink codes for each system***
Meritor Wabco Blink Code Diagnostic guide
Blink codes for bendix, meritor wabco and haldex
Trailer Teck light and brake tester
Here is a good resource on how the air brake system works
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Disclaimer: This video is for information only, do not attempt any repairs unless you are properly trained and competent.