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Old 12-27-2021, 01:48 PM   #1
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Locating the hydraulic brake cylinder

Trying to locate the brake master cylinder on my 2013 Dynamax Trilogy 5th Wheel. I've found and repaired a broken brake line, now I'm ready to fill/bleed the brakes.

The trailer has the all-season package installed which I believe is hiding the master cylinder. I don't know exactly where to start removing the insulating panels. Any insight would be greatly appreciated.

Larz
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Old 12-28-2021, 09:27 AM   #2
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welcome to the forum its a great place to get your questions answered. Are you sure the hydraulic line you fixed went to the brakes and not the leveling system?
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Old 12-28-2021, 10:16 AM   #3
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Yes, I'm sure. Thanks for your reply!

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Old 12-28-2021, 11:33 AM   #4
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You are correct they are hydraulic brakes. I'm going to assume your system is a electric over hydraulic if that is the case there is no master cylinder but rather a hydraulic pump and reservoir I would not think they would hide it in the covered area with that said who knows what about the forward compartment aft of the pin box?. hopefully someone with the same rig will chime in soon good luck.
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Old 12-28-2021, 01:14 PM   #5
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You are correct, not a master cylinder per se. I've stared at the front compartment endlessly to find this thing. I just don't see it there. Two main components there are auto-level hydraulics and the inverter.

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Old 12-28-2021, 06:49 PM   #6
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Here is what mine looks like up front in the front storage area.
looking through the generator box. although mine is a Cardinal.
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Old 12-28-2021, 07:37 PM   #7
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I'd locate the feed line on the front axle and trace it on the frame forward to either the pass thru storage or front storage bay. Surely the installer placed the actuator to be easily accessible as you need to be able to check fluid from time to time. Although I'm not familiar with a Dynamax ... I'd guess the Kodiak hydraulic brakes (looking closely at the photo) on a 2013 Trilogy would have been an owner add on. I personally installed the Kodiak brakes on my Silverback a few years back and really like them. My Hydrastar actuator is mounted in the front storage compartment.
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Old 12-29-2021, 11:06 AM   #8
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Thanks jeepin. I wish mine was standing out like that.

DieselGuy, tracing the brake line is the current plan but wanted to confirm before I start removing the foam board insulation.

It is raining right now but I think I have a couple more warm days in Dallas to accomplish this.
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Old 12-29-2021, 02:42 PM   #9
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thelarz ... I can't imagine anyone of sound mind and body doing an install of disk brakes that would hide the actuator underneath in the belly. You have to have access??? Does your pass thru storage have a door in the floor or in the rear wall? I'd check in those places before I started dropping the underbelly material. Maybe trace the blue wire from your pinbox electrical junction box on back to the actuator as an alternative search. Blue most always controls the brakes whether electrical/magnet or electric over hydraulic.
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