Sudden change in the amount of free play with the parking brake cable. Hmm.
The parking brake is made of a single overcenter handle, an adjustable
cable, an equalizer/shoe, a single cable for both sides of the rear axle,
and a pair of attachment ears on the rear wheel cylinders.
There are only three points where adjustments can be made- the brake
handle/front cable attachment, and then the two attachment points at the
rear wheel cylinders. The cable connects one cylinder to another by going
from one cylinder, through cable guides welded to the chassis, through the
equalizer shoe, back through the next guide and to the other wheel
cylinder. It's important to make sure these guides are well greased so
that you don't get any binding and the cable is free to apply equal
pressure to both brakes.
It is possible for the equalizer shoe to shear the pivot pin and be free of
the body work completely and still apply pressure to the brakes
somewhat. It *SHOULD* be attached to the bottom of the body tub on a
bracket, but if it's free hanging in the air, then something is amiss. The
pins are small, get a lot of wear and break easily. That would be my first
suspect.
In a case like this, you need to pull the rear wheels and drums, have
someone apply and release the parking brake while you are watching the
action below (with the car on stands!). Check the action of each part in
the assembly. Somewhere is a lot of unexected play.
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