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Looking for the Replacment Dexter Master Cylinder for a 8,000 lb Boat Trailer  

Updated 08/05/2026 | Published 08/01/2026

Question:

I have a Dexter master cylinder on an 8K lb boat trailer, it needs to be replaced. Could I add a reverse lockout solenoid to the new replacement? If so, I only have 5 from the break line port on the master cylinder to the trailer jack post, will it fit?

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Expert Reply:

Thanks for reaching out, Josh

As long as the replacement master cylinder is designed to accept one, yes, you can add a reverse lockout solenoid. With it being an 8,000 lb boat trailer, I'm assuming it has hydraulic disc brakes, which commonly use a reverse lockout solenoid.

As for the available space, 5" may be enough, I can verify the clearance once we know which Dexter surge brake actuator you have.

Can you provide the model number of your Dexter surge brake actuator? Once I have that, I can verify the correct replacement master cylinder and confirm whether a reverse lockout solenoid will clear your trailer jack.

expert reply by:
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James D
Josh H. profile picture

Josh H.

8/5/2026

It's a Titan model 10. I have already ordered the parts, so I guess I'll find out. Thank you.

James D. profile picture
Etrailer Expert

James D.

8/5/2026

@JoshH ok, no worries. These are the parts I would have recommended for a Titan Model 10. Replacement Master Cylinder for Dexter Model 10 and 20 Actuators for Disc Brakes # T4747100 If your Model 10 is a 2001 or newer, the Replacement Solenoid Valve # T4748800 installs directly to the master cylinder. If your Model 10 is 2000 or older, you'll also need the Solenoid Adapter Fitting # T4750200 to install the solenoid. We're here if you have any questions and thanks for choosing etrailer!

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