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Old 07-27-2020, 05:02 PM   #1
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Mastertow Dolly Brakes Jerking at low speeds

Just used our Mastertow Dolly with Hydraulic Brakes for the first time. All works great - except once off the highway when we got down to pretty low speeds, the brakes on the trailer jerked - like they were being applied too hard. It seemed to get better after changing the pressure applied with my foot on the RV brakes. Anyone know what could be causing the jerking? Or what we can do about it? Have read the manuals for Mastertow and googled to the end of the internet!
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Old 07-27-2020, 05:10 PM   #2
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Do you have a brake controller in the Motorhome? Or are they activated by surge actuator?
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Old 07-27-2020, 07:27 PM   #3
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Hi BetterRVlife! Welcome to the forum. I'm sure someone with surge brakes experience will chime in. My Master Tow has electric brakes.
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Old 07-27-2020, 07:28 PM   #4
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Thinking about it, could it be slop in the towing connection? Hitch/ball/receiver?
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Old 07-27-2020, 09:05 PM   #5
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Its called chucking.

Check the brake fluid.

Have someone watch how much the coupler moves.

Make sure the tongue is at the proper height.

Have the car pulled on against the front stops before strapping it down. Adds some tongue weight.
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Old 07-27-2020, 10:39 PM   #6
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Just throwing it out there, is the trailer ball the right size?
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