RonnieJ Posted April 14, 2018 Share Posted April 14, 2018 Hi All from Downunder, At the risk of being hounded out for a non Mack question I have a problem with the maxi brakes on my Volvo F7 which I am sure someone with air brake experience can shed some light on. The blocking valve which prevents the maxis being released until air pressure is up is not working as it should. Sometimes it will pop in easily, but mostly it requires a lot of force to push in and hold for a while before the maxis release. Any clues? Cheers Quote Link to comment https://www.bigmacktrucks.com/topic/53098-blocking-valve-problem/ Share on other sites More sharing options...
Mack Technician Posted April 25, 2018 Share Posted April 25, 2018 If pressure of system is not full you may have to hold for an extended period. That is natural. Quote Link to comment https://www.bigmacktrucks.com/topic/53098-blocking-valve-problem/#findComment-397621 Share on other sites More sharing options...
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