Justinizme Posted September 30, 2024 Share Posted September 30, 2024 Hello all, As the title states, I am having an issue with a truck in my shop. It is intermittent, and happens when the brakes are applied during shifts and if you sit in the cab and rapidly apply the brakes. After a few seconds, it will slowly release and operate as normal. I am stumped here. Should I start with the hill assist valve? I have no codes for brake issues and no lights/messages pop up. Quote Link to comment https://www.bigmacktrucks.com/topic/74595-brakes-staying-applied-once-brake-pedal-is-released-2012-mack-cxu/ Share on other sites More sharing options...
fjh Posted September 30, 2024 Share Posted September 30, 2024 assist valve? I have no codes for brake issues and no lights/messages pop up. Its a good start! Quote Link to comment https://www.bigmacktrucks.com/topic/74595-brakes-staying-applied-once-brake-pedal-is-released-2012-mack-cxu/#findComment-559251 Share on other sites More sharing options...
JNEUBY Posted 20 hours ago Share Posted 20 hours ago Its probably a little late for a reply. But the air release line for my hill holder was clogged up. Put two hill holder valves on it. Each time replacing the valve would loosen the mud dauber nest in the release airline and it would work for a while and then act up again. Valve was not the problem. Release air could not vent from the air line thanks to a mud dauber. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74595-brakes-staying-applied-once-brake-pedal-is-released-2012-mack-cxu/#findComment-567738 Share on other sites More sharing options...
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