Not sure what the inside shoe is, you have a primary and secondary shoe. The short shoe (primary) faces forward and the long shoe (secondary) faces rearward. You may have a stuck/frozen wheel cylinder, stuck/frozen e-brake cable, tired/broken hold down hardware and heavily worn wear pads on the backing plate, to name a few.
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The Parking Brake has a couple of configurations, on some vehicles with rear disc brakes it will press the inside pad of the caliper and squeeze the pad against the brake rotor to engage, some vehicles have a small set of brake shoes inside the rear rotor hub which press against the hub and prevent it from turning when the brake lever is engaged. On vehicles with rear drum brakes, the parking brake causes the rear brake shoe on either side to press against the brake drum and prevent it from turning. Either configuration in on the rear wheels.Usually the rear axle. The parking brakes are also the emergency brakes, and if they were on the front, could render the vehicle unsteerable in an accident avoidance maneuver.Rear brakes. On some older cars they parking brake actually surrounded the drive shaft and when applied lock the drive shaft in place. Today the parking brake applies the rear brakes.
if you have a brake shoe on rear brakes, you do not have rear disk brakes pads go on disks.shoes go on drum brakes
The front brakes on any vehicle do most of the stopping. When you apply the brakes the weight shifts to the front of the vehicle. For this reason the front brakes are needed more than the rear. Try stopping a vehicle with just the hand brake which applies only the rear brakes.
If memory serves, the typical braking force ratio for any automobile with front disc and rear drum brakes is 60% front, 40% rear +/-.
If you only did the front brakes, the problem may be in the rear brakes.