Parking Brake Shoe Replacement
How are parking brake shoe issues diagnosed?
If the parking brake lever fails to engage the parking brake, the parking brake cable is normally out of adjustment, however, this could also be the result of a damaged parking brake. If the parking brake cable is intact, and properly adjusted, yet the parking brakes do not engage, a failed parking brake is most likely the culprit. This will be noted as the parking brake will actuate at the wheel, but not sufficiently to hold the vehicle while in gear or on a hill. If this is the case, the wheel and tire must be removed, followed by the brake caliper, brake caliper bracket, and finally the rear brake rotor, which contains the auxiliary brake drum. Upon removal of these components, any breakage or wear patterns may be immediately noticed by the servicing technician.
How is a parking brake shoe replaced?
Replacement is typically a dirty job, as the auxiliary parking brake is mounted to the service brakes, therefore being subjected to road grime, brake dust, high temperatures, moisture, and salt. The rear wheels must be removed to allow access to the brakes. Afterwards, the rear brake caliper must be removed from the rear brake caliper mounting bracket, and then the rear brake caliper mounting bracket must be removed. The rear brake caliper must be hung out of the way to prevent damage to brake lines. Once these items are out of the way, the combination rear brake rotor and auxiliary drum, which is one individual component, is removed, exposing the auxiliary parking brake shoes and mounting hardware. In cases of extreme damage or wear, this may prove to be an extremely difficult task. The brake shoes and mounting hardware are then removed, and replaced. If wear or grooving are noted on the inner lining of the auxiliary brake drum, the rear service brakes must be replaced as well to ensure proper parking brake operation. Installation is the reverse order of these operations, and, if necessary, adjustment of the parking brake cable is performed before the vehicle is returned to the ground.
RepairPal Recommendations for parking brake shoe issues
The service brakes do not typically need servicing for this replacement, however, if the auxiliary drum parking brakes show signs of wear, the service brakes may require a full service replacement. If the parking brake failed to completely release, the auxiliary parking brakes may need full servicing as the brakes will experience wear, grooving, and extreme temperatures. Some parking brakes are adjusted automatically when the brake is used. This means that failure to set the parking brake over a long period of time may cause the parking brake to fail, and manual adjustment may be necessary if repeated attempts to set the brake do not bring the cable back into proper adjustment. To avoid this, always set the parking brake, whether or not the vehicle is parked on a hill.
What to look out for when dealing with parking brake shoe issues
The cost of auxiliary parking brakes will vary by vehicle and type. Auxiliary parking brake drums cannot be resurfaced, as most resurfacing machines do not have the capability to reach into the tiny drums, as well they are not made with sufficient thickness to properly machine. This means if the parking brake is left on for any extended period of time, the rear service brakes and parking brakes will need a complete brake service. To avoid this, ensure the parking brake is fully disengaged every time the vehicle is driven.
Can I replace the parking brake shoe myself?
The braking system can be maintained by a DIYer with a complete knowledge of hydraulically actuated systems. This is important as testing brake operation, and safe installation of braking components rely on this knowledge. If the complete braking system is not understood, damage to the expensive braking components, or injury is likely. Trusting a professional technician with the replacement of any braking component is normally the best course of action.
