Looking For Replacement Master Cylinder For Actuator On 1988 Dual Axle Boat Trailer

Updated 05/27/2026 | Published 05/23/2026

Question:

i have an 1988 25 ft dual axle boat trailer drum brakes the master cyclinder is shot the hole spread is about an 1 apart inch wide 4 inch ling does the Dexter Aero 7500 replace this?

asked by: Ed S

Expert Reply:

Hey Ed, thanks for reaching out. The mounting holes on the # T4395100 Master Cylinder are 1-5/8" wide x 3-5/8" tall, so it doesn't sound like this will match up with what you have.

Generally, these replacement master cylinders are brand and model specific to the actuator.

Do you know the brand and model of the current actuator?

expert reply by: Jesse M

Replacement Master Cylinder Assembly for Dexter Model 60 and Aero 7500 Brake Actuators - Drum
(click to enlarge)

Ed S.

5/27/2026

no i dont know the brand the trailer is a 1988 boat trailer 25ft long

Jesse M.

5/27/2026

@EdS Yea I figured as much. In that case, it's probably time to replace the entire actuator. It's really not possible to match up parts without knowing what you have? The Demco Hydraulic Brake Actuator # DM72VR is a solid option for drum brakes. Or the # DM62VR if you want an electric lockout. Both will bolt on top of a 3" wide trailer tongue. Is the current actuator bolted or welded on?

5/27/2026

@EdS.welded on