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Check out my response in the Community Forum to virginiak question "What do I have to get to tow?" I explained how the 4 wheel hydraulic/vacuum disc brakes work. The hose is connected to a coupling mounted on the vehicle which gives you a vacuum source from the engine. The knob behind the tanks and below the brake system reservoir releases the brakes once the trailer has been parked. To fully appreciate the system, you need a service manual.
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Craig
AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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