fixed that for ya
You don't tow much, do ya?
Yes, there is a lock out, but *
generally * it requires the driver to exit the tow vehicle to install a mechanical device that prevents the actuation of the tongue mounted master cylinder. Of course that means there will be
zero trailer brakes as long as the lock out is installed.
*
caveat
There are electrically activated lockouts,and I've installed a few for some customers that haul equipment in rough terrain, but they have proven to be ... less than optimal ... and often jam up under load
... one of my favorite mentors was involved in a major accident on a jobsite when the equipment trailer jack knifed and then rolled the truck he was driving, so I'm not a fan to put it mildly
There's a reason electric trailer brakes are the standard of the industry ( in most cases ) for non CDL rigs
Being able to adjust braking force from inside the tow vehicle for varying conditions
especially emergencies has made surge brakes all but obsolete
The instant programmability ( in both the level of immediate braking force and ramp up of braking force ) of the newer units is quite impressive, but it's an absolute life saver when the trailer brakes can be applied independently of the tow rig in certain dynamic conditions by simply activating the slider from inside the tow rig
my grandads old chevy from the 70's has an ancient analog unit that still works just fine
... slider is a lil sticky from being doused in coffee/alcohol and tobacco juice over the decades, but it flat works when you need it
... I'm sure there's a time and place for surge brakes, but I'll stick with electric trailer brakes myself as they've saved my ass many a time in all kinds of weather
nothing beats electric trailer brakes on an icy/snow covered road