How to Find Surge Coupler, Wheel Cylinders and Bearings for 1997 Eagle Double Axle Boat Trailer

Updated 06/02/2014 | Published 05/30/2014

Question:

Hello, Im thinking about replacing the Surge Brakes on my 1997 Eagle Double Axle Trailer. Im pretty sure they have never worked since I bought the boat in 2002 I dont trailer often as it stays at my cottage. I have poured brake fluid in the master cylinder several times, and it eventually leaks out although I dont know where. I would imagine the wheel cylinders are rusted out as well, but the brake pads are probably fine. Not sure about the trailer axle bearings either, Im sure it wouldnt hurt to replace those. Ive watched some videos on how to do it and it does look like quite the project, but Im sure I can figure it out. So, Im guessing I need a new Surge Brake Actuator, bearings races too?, and wheel cylinders. How do I find out what parts I need? It looks like there are several sizes of trailer bearings, actuators, etc. Any help would be appreciated!

asked by: Scott G

Expert Reply:

For the actuator, you'd want to choose one compatible with drum brakes with sufficient capacity for the weight of your trailer. You'd also need to choose between a bolt-on or a weld-on application, the trailer ball size and the lock-out desired (none, manual or electric). You can see our selection by clicking the provided link.

The wheel cylinder is a likely place to check for leaks, but if the trailer's been sitting for awhile, you might be better off replacing the brake assemblies, so you are getting all new parts. I've linked you to our selection of replacement wheel cylinders. If you know or can find the manufacturer of the brake assemblies, it would make finding replacement parts much easier. You also might be able to look at your existing wheel cylinders and match them up visually. To choose the correct replacement brake assembly, you'd measure the inside diameter and depth of your brake drums, and choose a comparable brake assembly that has the same size and mounting bolt pattern.

To chose the correct bearings/races/seals, you'll need the reference numbers off the existing bearings. The reference number is stamped into the bearing cages. If you cannot read the number, you can take an accurate measuring device like a digital caliper and measuring the surfaces of the spindle where the inner and outer bearing ride, as well as the surface where the grease seal rides. I'll also need the outer diameter of the grease seal, or the inside diameter of the hub bore.

With this information, we'll be well on the way to finding the correct replacement parts that will allow you to move your boat around safely. If you'd care to reply with those measurements, I'd be happy to help.

expert reply by: Mike L