Replacement Master Cylinder or Coupler for Old Rental Trailer

Updated 02/18/2015 | Published 02/17/2015

Question:

we need to know what we can use for master cylinder . body lenth is 6 1/4. from boot to fitting for line. thickness is 2 1/4 width . measured at holes.. center to center is 3 7/16. thank you.. axles have drum brakes. do we need to re plumb hyd lines and fittings, what size lines.

asked by: Chuck P

Expert Reply:

For the most part, master cylinders for hydraulic brake actuators are model specific. Is there any indication on the hydraulic coupler what the manufacturer and model number of the actuator is? Without that information, I really wouldn't be able to make a recommendation for a replacement master cylinder.

Hydraulic trailer brakes typically use 3/16 inch brake lines. You shouldn't need to replumb the lines if they're in good shape, but if you can't identify the manufacturer of the actuator, you might need to replace the actuator with one that's compatible with drum brakes. I've linked you to our selection of hydraulic brake actuator couplers that are compatible with drum brake systems.

expert reply by: Mike L