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Switching Master Cylinder in DA66B to Convert to Disc Brakes  

Updated 06/02/2023 | Published 06/01/2023

Question:

I am converting my boat trailer from drum to disk that currently does not have a reverse lockout, only running a 4 pin connector. Will this replace my current master cylinder in a demco da66b and work?

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Expert Reply:

Yes, you can swap out the master cylinder in your DA66B to convert to disc brakes. Since it does not have a reverse lockout, you actually want the # DM5919 instead of the # 5672. The # DM5919 comes with an inline solenoid. You will also need a 5-way for your trailer # HM47910 as well as an adapter for the vehicle side # C57187.

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Robin H

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