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Blocking Valve problem


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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

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