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Replacement For 3,500 lb Hydraulic Drum Brake Assembly For Boat Trailer  

Updated 09/26/2023 | Published 09/25/2023

Question:

Hi, Thanks for chatting with me earlier. I am looking to replace the hydraulic brake kit on my boat trailer. It’s a tandem trailer. I bought it a few weeks ago, and I just disassembled the brakes, and it was all falling apart. I am attaching below a photo of the current assembly. Tire: 205/65-10 Style of brake - Hydraulic Axle, 2” square. External bearings L44649. Internal bearings L68149. Its a 5-lug with a 3,500 lbs axle capacity. Drum internal diameter 8.5” x 2-1/4” wide Let me know if you have a replacement. My current one does have a connection for washing it from salt water, and it will be great if it will not lock when reversing with the trailer. Thanks

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Expert Reply:

So you're going to have to change out your hub and drum as well as tires to get a replacement brake assembly. The issue is your current drum being only 8.5” diameter x 2-1/4” wide; there are no brakes that fit that size drum. I appreciate all the info you provided and based on that, here is what you'll need:

- Trailer Hub and Drum Assembly - 3,500-lb Axles - 10" Diameter - 5 on 4-1/2 - Galvanized # AKHD-545-35-G-K

- Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 10" - Left/Right Hand - 3,500 lbs # AKFBBRK-35-D

- Mounting Hardware # BRKH10B

- Karrier ST205/75R14 Radial Trailer Tire with 14" Galvanized Wheel - 5 on 4-1/2 # AM32156

expert reply by:
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Kyle S
3,500 lb Hydraulic Drum Brake Assembly
3,500 lb Hydraulic Drum Brake Assembly
(click to enlarge)
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