What Brake Fluid & Lock For Demco Hydraulic Drum Brake Actuator
Updated 01/05/2026 | Published 09/26/2024
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Question:
4 Questions What brake fluid should I use? I replaced the complete brake set, and the actuator. I blew the lines out before I installed everything to make sure they were not restricted so the brake lines are empty. Can I use a vacuum bleeder on this to bleed the brakes? Do you know how much fluid I will need? What do I need for a lock to lock this hitch?
asked by: Mike K
Expert Reply:
Hi Mike,
For the Demco Hydraulic Brake Actuator - Drum # DM72VR, Demco just recommend using any DOT 3 or 4 brake fluid, and a 12 oz. bottle will be fine, which you can find at any type of auto parts or big chain store. As for bleeding the brakes, you won't be able to use a vacuum bleeder, you'll need to follow the directions that come with the actuator and do that by hand.
Then for a lock, you can either use a pin lock like # e98888 or surround lock like # FA86-0015-316.
Product Page this Question was Asked From
Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs
- Brake Actuator
- Surge Brake Actuator
- Boat Trailer
- Construction Trailer
- Farm Trailer
- Travel Trailer
- Utility Trailer
- Bolt-On
- 7000 lbs GTW
- 2 Inch Ball Coupler
- 3 Inch Channel Tongue
- Drum Brakes
- No Lockout
- Demco
more information >
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on Brake Actuator
Jerred H.
1/5/2026
Hey Mike, how did things go with bleeding the brakes on your Demco actuator using the hand method? It’d be great to hear if the DOT 3 or 4 fluid and the 12 oz. amount worked out as expected. Your update could make it easier for others working on the same setup.