scottmandu
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If your parking brake is not activating, the check valve located behind the front bumper under the emergency glad hand may be bad. This check valve sends air to the emergency air chambers, from the vehicle's air source or the pulling vehicles air source through the emergency glad hand. I've learned this after spending about 6 hours tracing down every line in the parking brake circuit. The valve can be overhauled. The repair kit is about $15 and the valve itself is $35
![2017-12-03 10.24.14.jpg 2017-12-03 10.24.14.jpg](https://www.steelsoldiers.com/data/attachments/487/487422-62369f5de01e4ef818d8bc9a8bbc413a.jpg)
![2017-12-03 10.24.14.jpg 2017-12-03 10.24.14.jpg](https://www.steelsoldiers.com/data/attachments/487/487422-62369f5de01e4ef818d8bc9a8bbc413a.jpg)