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How to Measure Hub/Drum to Determine Size of Replacement Brake Assembly for Jayco Tent Trailer

Question:

I have a 96 Jayco Tent Trailer, The model number is : 1007 Jay series 96FD...I need new master cylinder and brake assemblies...What do you recommend?

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Expert Reply:

My research into the specs for your 1996 Jayco J-1007 tent trailer suggests that unit had electric drum brakes rather than hydraulic brakes. Certainly it is possible that at some point the coupler was changed from a standard a-frame coupler to a surge coupler for hydraulic drum brakes. For a smaller cozy single-axle trailer like the J-1007 that would be a lot of work for not much payoff since electric brakes typically cost less and are easier to work on. The brake you referenced, # AKEBRK-35, is electric.

If you do indeed have a surge coupler for drum brakes like # T2492800 on the trailer then you will want to note the brand of coupler; I can then offer a recommendation for a master cylinder.

If you in fact have electric drum brakes then what you'll want to confirm is the axle weight rating (from the main trailer sticker or on the axle itself). You can also pull a wheel and one hub and measure the drum depth and diameter (see photo please). If you can tell me the axle capacity and brake drum size I can offer recommendations.

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