Dditto31 Posted November 14, 2019 Share Posted November 14, 2019 we are having an issue with the air brakes on our 2011 mru613, foot brake and hand brake work as they should how ever the parking brake valve is set but brakes are released. push the button and it wont stay in. again the parking brake button is in the SET position but brakes are NOT set button will not stay in when pressed. any ideas? ive already replaced the button valve thinking it could be bad, also the pressure protection valve on the in dash manifold is constantly leaking air after it reaches 60/80 psi. Quote Link to comment https://www.bigmacktrucks.com/topic/59839-air-brake-issue/ Share on other sites More sharing options...
MackTech Posted November 16, 2019 Share Posted November 16, 2019 Are you saying the parking brakes aren't engaging with the yellow button out? Quote Link to comment https://www.bigmacktrucks.com/topic/59839-air-brake-issue/#findComment-435988 Share on other sites More sharing options...
JoeH Posted November 16, 2019 Share Posted November 16, 2019 So replace the protection valve in the dash. It shouldn't be leaking. Quote Link to comment https://www.bigmacktrucks.com/topic/59839-air-brake-issue/#findComment-435998 Share on other sites More sharing options...
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