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Tractor Talk Discussion Forum

OT: Truck air brake problems

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wantadumptruck

03-02-2008 16:11:36




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Hello,

Got a Mack dm-600 dump. Problem is when you push on brake pedel quick the emergency brake valve pops on, apply the emergency brakes. Truck has good air pressure and no apperant leaks, There are three lines on the emergency brake valve, and I have found the If I take the center small line off and cap the line, It won't do it and the brakes work fine. With that line off, and uncapped when you push on the brakes air blows out this line.

I traced the line to a valve under the cab mounted on the frame. It looks like a diaphram valve??? of some short??? With 2 or so larger lines on it??

This is the first air brake setup I have worked on.

Thanks,

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Bob

03-02-2008 20:11:42




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 Re: OT: Truck air brake problems in reply to HENRY E NC, 03-02-2008 16:11:36  
Are BOTH "pucks" good in your "spring brake" chambers?



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this may help

03-02-2008 16:41:53




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 Re: OT: Truck air brake problems in reply to wantadumptruck, 03-02-2008 16:11:36  
The small line you have off comes from the foot valve to the service valve. When you press the foot pedal it sends air to the service valve which in return send air to the brakes (brake chamber).I would look and see if there is another valve that is close a (park brake valve) either one could be the problem



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Mike Burton

03-02-2008 16:36:45




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 Re: OT: Truck air brake problems in reply to wantadumptruck, 03-02-2008 16:11:36  
I have to agree with Gregg. If you're not experienced with air brakes, take it to someone who is.



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gregg

03-02-2008 16:25:32




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 Re: OT: Truck air brake problems in reply to wantadumptruck, 03-02-2008 16:11:36  
To be truthful this isn"t a do it yourself job. I have my A transport license and I would think of messing with the brakes.



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