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How to Replace the Master Cylinder on an Atwood Actuator 85778


The coupler on my trailer is welded on, and the brakes have not been serviced in some time so the fluid has many large particles in it. Wondering if I can remove the master cylinder with the top bolts after I remove the brake line? I cant see well enough, and the exploded diagram that Ive looked at on-line dont seem to help me understand, how the piston, which is on the port side of the coupler, attaches to the master cylinder/reservoir.


Expert Reply:

We actually have a video showing how to replace the master cylinder on an Atwood surge brake actuator like your part 85778 which I have linked for you to reference.

In the video you can see that once you remove the 4 screws the master cylinder can be removed but there is a gasket that seals it to the cover of your actuator so it may be a little difficult to initially move.

expert reply by:
Jon G

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