on my 47 1/2 ton the ebrake, or parking brake, handle is located to the right of the shifter and is a hand operated lever.

On a 48 the same lever is moved to the left of the clutch.

On a 52 you should have a foot operated style that mounts on the left side of the clutch pedal and a hand operated release lever under the dash that would be operated with your fingers.

Look for a set up from a 49 to 54. All the parts should interchange. I will check I should have the pedal and release rod.