Originally Posted by aircooled4
Id not seen one of these in pictures...anyone here familiar with this setup? Its a hydraulic set up to lock the wheels in place when its parked...the handle lifts up and uses hydraulics to pressurize the wheel cylinders...Ive not seen this before...when i released the handle, it seemed pressurized, SO, i hope the wheels turn tomorrow morning!
That is not a parking brake.
Back then, like way back then, the trailer brakes were hydraulic.
They were operated by a coupler tied into the hydraulic line of the tow vehicle, using a long flexible brake line hose.
That coupler, was attached to the trailer, and held in place by the handle that's shown in your photo.
The piston in that coupler would move when the tow vehicle brakes were applied. The piston in turn, moved the shaft in the cyclinder that's mounted on the trailer. That in turn, applied the trailer brakes.
That system was outlawed when the split hyraulic systems became available on cars. The coupler was so large, that it would rob far move fluid from the rear axle brakes of the tow vehicle, to the degree that they would not work.
Parts for that system have been history for about 45 years.