EZ Loader Trailer Brakes Not Releasing and Caliper Replacement Advice

Question

Question:

I need to replace disc calipers on an EZLoader tandem boat trailer. The VIN is 1L8LA******6A028201 What do you recommend? Freshwater use only. I need to replace the calipers because I have one that seems to not fully release when the surge accuator is pulled out. The hubs became so hot it boiled out my hub oil. I released the bleed screw and it pulls fine, just no brakes. Thanks.

asked by: Tab O

0

Expert Reply:

Tab, I get why this has you concerned. When a hub gets hot enough to boil out oil, it really makes you question the whole brake system. The big clue in what you described is that when you crack the bleeder, the wheel frees up. That usually means the pressure isn’t releasing back through the system, not just that the caliper is sticking. The most common cause is a rubber brake hose that’s failed internally and is acting like a one way valve, letting pressure in but not back out.

EZ Loader typically uses DB-35 style caliper like part # K71-773-02, either for ten inch rotors with five lug wheels or twelve inch rotors with six lug wheels, so matching what you already have is the safest move. A standard zinc caliper is fine for freshwater. If you have five lug wheels, you’re almost certainly running ten inch rotors. If you have six lug wheels, it’s typically twelve inch rotors. Once we confirm that, we can match you with the correct caliper.

If this were mine, I wouldn’t just replace the one caliper. I’d do both on that axle at least, replace the rubber brake hoses, and flush the system with fresh fluid. I’d also make sure the actuator is sliding back freely and not holding pressure. I can’t confirm your exact size from the VIN alone, so I’d just need to know if you’ve got five lug or six lug wheels, or the rotor size, to point you to the exact parts.

What boat are you towing?

expert reply by: Heather A

0

Tab O.

3/18/2026

Thanks for your reply. The trailer is for a 2006 Tige 24ve. The EZ Loader was the factory supplied trailer when boat was purchased new. The trailer has 5 lug rotor/hub. The rotors measure 9.75 not 10, I don't know if that makes a difference. I'll replace rubber lines, what about the steel lines? This trailer sat for many years neglected and when I flushed system fluid was rust colored. After flush, fluid retains it's clear color without additional contamination. I replaced the old actuator with a Dexter 34044 Ufp Inner Slide Model A-60, 7500 LB Disc Brake Actuator, 2" Ball, 4 years ago. That's how long I've been dealing with this. Thanks so much for your help!

Heather A.

3/27/2026

@TabO Sorry I missed your comment until Chris told me! I really appreciate all that detail, that helps a lot. And honestly, you’ve already done a lot of the right things here, so I get why it’s frustrating that this has been lingering. That 9.75 inch measurement you’re getting is actually what we typically see called a “10 inch” rotor in this setup, so with your 5 lug pattern you’re right in that standard DB-35 range. That means sticking with a replacement like the K71-773-02 is still the right call and will match what you’ve got. The fact that the fluid was rust colored before but is now staying clear after the flush is a really good sign. That tells me you got most of the contamination out of the system, which is huge. On the steel lines, if they’re not actively leaking, kinked, or heavily corroded on the outside, you’re usually okay to keep them. They’re a lot less prone to internal failure compared to the rubber hoses. That said, since this trailer sat for a long time, it’s worth giving them a close look, especially at fittings and bends, just to make sure there’s no hidden rust weakening them. The sticking point still comes back to what you described earlier with cracking the bleeder and the wheel freeing up. That’s classic trapped pressure, and the rubber brake hoses are still the number one suspect, especially with age and sitting. They can look perfectly fine on the outside but break down internally and act like a check valve. Since you’ve already replaced the actuator, my game plan would be to replace both calipers on that axle like you mentioned, swap out all the rubber hoses, and then do a really thorough flush with fresh fluid. While you’re in there, I’d also double check that the actuator is fully returning and not hanging up at all, even slightly. You’re definitely on the right track here, this just feels like one of those cases where a couple aging components are stacking up to cause the issue. Out of curiosity, when it locks up, is it happening on one side only or both wheels on that axle?

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EZ Loader Trailer Brakes Not Releasing and Caliper Replacement Advice

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