macattack Posted January 14, 2011 Share Posted January 14, 2011 hey gang. i noticed that after i release my parking brake i can hear the dash valve exhausting for what seems like a long time. do you think i have a bad dash valve or qr valve. or is it a brake adjustment that is needed? the brakes seem to release quick though.thanks Quote Link to comment https://www.bigmacktrucks.com/topic/17267-dash-valve/ Share on other sites More sharing options...
Hook n ladder 1 Posted January 25, 2011 Share Posted January 25, 2011 Do you have anti-lock brakes? If so it could be the ABS valve leaking. The valve leaks and also makes the valve behind the dash sound like it's leaking. The abs valve should be mounted on the frame rails near each brake chamber ( there are 2 for the axle with abs...one on each frame rail). Quote Link to comment https://www.bigmacktrucks.com/topic/17267-dash-valve/#findComment-71547 Share on other sites More sharing options...
Lmackattack Posted January 25, 2011 Share Posted January 25, 2011 its possible that you have dirt or a clogged air line. it may take more time to fill the parking system or you have a slight leak? IIRC all the parking system does is push back on the springs to keep them released. There also may be a Anti Compounding valve? that may give you the same issue. I dont recall how that valve is plumbed but its used in alot of spring brake air systems Quote Link to comment https://www.bigmacktrucks.com/topic/17267-dash-valve/#findComment-71556 Share on other sites More sharing options...
b61mack Posted January 25, 2011 Share Posted January 25, 2011 hey gang. i noticed that after i release my parking brake i can hear the dash valve exhausting for what seems like a long time. do you think i have a bad dash valve or qr valve. or is it a brake adjustment that is needed? the brakes seem to release quick though.thanksI have a 72 R Model dose the same thing, replaced the dash valve still leaks im thinking it is a double checkvalve down by the foot valve. dont use the truck much anymore will find out this summer. Quote Link to comment https://www.bigmacktrucks.com/topic/17267-dash-valve/#findComment-71610 Share on other sites More sharing options...
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