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Which is Better Master Cylinder Lockout Design for Demco Surge Actuator # DM5920 or # DM5921  

Updated 04/29/2020 | Published 04/28/2020

Question:

Looking at item DM59020 vs DM5921. What is the advantage of the bypass design on the solenoid? I have a 18foot flatbed, dual 7,000 lbs axles with drum brakes. Hydraulic unit is shot so Im rebuilding with new slides, shocks and master cylinder. Just wondering what master cylinder I should go with. Trailer gets daily use for about 4 months in interior Alaska then almost no use for the 8 months we call winter! Usually medium weight loads and not backing down many hills. But occasionally will haul 1,000 gal of water or a vehicle. Thanks for helping me decide. Price isnt an issue.

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Expert Reply:

The part # DM5921 is a replacement master cylinder with electric lockout that fits your Demco DA20 coupler which has a lockout design that basically stops the hydraulic pressure from getting to the brake assemblies whereas the # DM5921 has a bypass design that directs the fluid/pressure back into the master cylinder when locked out. The bypass style is easier on the master cylinder since the pressure has somewhere to go so if you wanted the best design this is the way to go.

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Jameson C
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