Operating Hydraulic Trailer Brakes with Air Brake System on Tractor Trailer
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Question:
We have a home made hay trailer that we used a 2 ton truck rear axle with out the 3rd member in it as the axle for the trailer. That axle had HYD brakes on it. All we did was unhook the steel lines going to the axle brakes when we made the trailer. At the time we was pulling the trailer with a farm tractor and didnt need the brakes. And now we need to pull the home made hay trailer with our 1999 INTL 9100 road truck tractor that has air brakes. What can we do to hook up the hyd brakes to air brakes so we dont have to cut the axle out and install a axle that has air brakes already on it? Thanks.
asked by: Steve B
Expert Reply:
You can use your tractor trailer's air brakes to activate the hydraulic brakes on your hay trailer axle by using the Hayes Air Actuated Trailer Brake Controller # HA100400C along with an electric-over-hydraulic (EOH) drum brake actuator like # HBA-12 on the trailer.
The Hayes controller will take in the tractor trailer's air brake pressure and convert this to an electrical output signal. This electrical brake signal will then connect to the EOH actuator which will then in turn convert that electrical signal into hydraulic pressure to operate the brakes on the truck axle that you installed on the trailer.
The drum brake actuator # HBA-12 produces 1200-psi hydraulic pressure; you will want to confirm the pressure needed by your brake assemblies. The EOH actuator # HBA16 for disc brakes operates at a higher 1600-psi pressure.
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on Trailer Brake Controller
