How to Bleed Brakes With Dexter Zinc-Plated Brake Actuator

Updated 11/30/2023 | Published 11/29/2023

Question:

I just received the dexter zinc plated brake actuator. T47457007k. I was disappointed that it did not come with instructions. I have a different model on another trailer. It has a place for a screwdriver to bleed the brakes. However I don’t see this. So I am concerned with not knowing how to bleed the brakes on this model.

asked by: Vernon A

Expert Reply:

The Dexter Zinc-Plated Brake Actuator # T47457007K does not have an access hole to insert a screwdriver to bleed the master cylinder. You will have to use the old method with a 2x4 and the safety chains.

While the trailer is disconnected from the vehicle, hook the trailer safety chains together to form a loop centered below the coupler. Place a sturdy board, like a 2x4, through the safety chain loop. The safety chain loop will help give you the leverage you need to collapse the actuator. It’s best to have a board at least 4’ long so that it extends well above the actuator.

Position the board against the front end of the actuator’s coupler and use it to force the coupler case into the actuator’s outer housing. This process simulates actual braking and will pump brake fluid into the trailer's hydraulic system. Manually pull the coupler case back so it’s fully extended and repeat process until air bubbling stops inside the master cylinder.

I have also attached a helpful article below which covers how to bleed surge brakes for your reference.

expert reply by: Robin H