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If the cable is broken and parking/emergency brake is still ON, then they are rusted in place ! - Your emergency brake system needs urgent work.
The brake pads are actually shoes. The emergency brake relies on the rear brake shoes being applied by tension on the emergency brake cable against the rear drums to hold the car stationary. In other words, the rear brakes double as the emergency (parking) brakes.
I don't know about Silverado trucks but all of the emergency (parking) brakes I'm familiar with use the brake cable to "pull" and hold the brake against the drum (or disk), so if the cable breaks you simply cannot apply the emergency brake. That is, it is automatically released if the the cable breaks.
You are possibly referring to the emergency or parking brake cable. This hooks to a pedal or lever in the drivers area.
The parking brake has an adjustment bolt on the brake shoe. The parking brake cable has adjustments on each end of the cable.
A stuck parking brake could be caused by several things. The brake cable that operates that brake could be stuck, or the mechanism could be stuck at the wheel. The wheel will need to be removed and the cable and emergency brake arms will have to be checked.
To tighten the emergency brake cable on a 1990 Geo Prism, start by depressing the brake pedal. Next, locate the parking brake equalizer bar. Rotate both rear tires to feel the brake shoes slightly drag against the brake drum.
The emergency brake cable is held in place with swivel nuts on each end of the cable. Turn the swivel nuts to the left. The emergency brake cable will come off.
The 1997 Chrysler Sebring parking brake cable has adjustment nuts on each end of the cable. Adjusting the nuts will lengthen or shorten the parking brake cable.
Cable is rusted, bent, or hanging for some reason. Could also be the parking brake needs adjustment. The brake is not fully releasing.
Parking brake cable? Connect to the cable from the opposite side and the emergency brake cable from the control inside the cab. Self-adjusting cable? Connects to the "star wheel" and the brake shoe return spring inside the drum
Look at the two cable going to each drum to see if just one is stuck on or both. IS it drum or disc? It is the emergency brake cable. It happened to me once before and the tow truck driver said the release is the same as in a Cadillac, but that doesn't help me and I can't afford another tow truck driver. In a caddilac you put it in drive to release the parking brake. But when the cable is broken you can't engage the parking brake.