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The wife was driving Shrek this weekend with yours truly riding shotgun (a normal scenario). We noticed that the air was bleeding down pretty fast at long traffic lights as the brakes were held, so I had a look when we got home. I found that air was venting pretty heavily out of the front Service glad hand vent and the Air Brake Protection Valve on the frame over the rear axle. After some troubleshooting and talking to Suprman ( Thanks Will! ), I found that the check valve for the front Service glad hand had debris under the diaphragm and the Air Brake Protection Valve had a crack in the rubber disc on top that acts like a check valve. After some quick cleaning and repairs, all is well and Shrek holds air like normal. It amazes me sometimes how simple problems can be such a headache to find and bring things to a halt.
![20150902_191430.jpg 20150902_191430.jpg](https://www.steelsoldiers.com/data/attachments/395/395472-107dab8ef4f47ee0570a54e93d43d1ba.jpg)
![20150902_191415.jpg 20150902_191415.jpg](https://www.steelsoldiers.com/data/attachments/395/395471-4aab8228de8696d98c0d253ff5264942.jpg)
![20150902_191430.jpg 20150902_191430.jpg](https://www.steelsoldiers.com/data/attachments/395/395472-107dab8ef4f47ee0570a54e93d43d1ba.jpg)
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