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Thank you Tim, You provided great information! This weekend I will be out at the museum and will look at the button on the brake lock, as your diagram shows verify if the button has excessive wear, if it moves freely and confirm the manufacturer name. While reading the PDF, I did remember...

Thank you DG, I will try the brakes with the air system drained and look into a master cylinder rebuild kit. The brake adjustment seem OK (by sound after I adjusted them). My main question would be what could cause ALL the wheels to lock up together when applied.

Over the last week or so, I’ve had a brake issue with my M-548 wrecker. After depressing the brake pedal the brakes will not release again. The harder you depress the pedal, the harder the brakes apply. The brakes will only release if you crack a wheel cylinder bleeder at a wheel on any axle...