Select Language

The Brakes

Ford Light Truck Rear Drum Installation Problems or Severe Brake Drag

Rear brake shoe performance and wear can be adversely affected if the parking brake is not releasing properly. Often this is not discovered until the brakes are replaced and there is difficulty installing the drums. And then, the new friction is commonly blamed for this situation.

Other symptoms of a problem that can be related to the parking brake are accelerated wear, an unusual wear pattern on the shoe, brake shoe drag, and difficulty removing the drum for inspection.

Uneven-Drum-Brake-Wear-Illustration
Fig. 1 Uneven wear can be an indicator that the parking brake is not releasing completely and will be evident on both primary and secondary shoes.

[A partially engaged parking brake] can cause noise, premature rear brake lock-up and hot spots in the drum. This will eventually create a wear pattern on the shoe.

If the parking brake is partially engaged, it will force the brake shoe off the anchor and create a continuous drag of the shoe against the drum. This can cause noise, premature rear brake lock-up and hot spots in the drum. This will eventually create a wear pattern on the shoe. The amount of brake drag created will depend on the shoe adjustment and cable restriction. Even a high amount of brake drag may go unnoticed by the driver. Also, if new shoes are installed, they may not fit correctly.

Typical-Parking-Brake-System-Illustration
Fig. 2 Typical parking brake system.

Parking cable release can be affected by the improper operation of the passenger compartment actuator. The “press to apply-press to release” type can maintain tension on the cable while appearing to be released. The self adjuster built into this brake pedal assembly may not release properly.

Ford-Parking-Brake-Actuator-Illustration
Fig. 4 Typical ford "press to apply press to release" parking brake actuator. Left: released pedal position. Right: an actuator where the adjusting mechanism built into the foot pedal assembly has prevented a complete release. Note the self-adjuster wheel and cable position.

If the pedal does not return completely, figure 4, there will still be tension in the cable assembly going to the rear wheels.

Tension-In-Brake-Cable-Assembly-Illustration
Fig. 5: A comparison of a parking brake when fully or partially released. Note space and position of lever relative to a secondary shoe.

Tension in the brake cable assembly will cause partial application of parking brake as shown in figure 5. Parking brake release can be observed if the cable is actuated as shown in figure 3 and movement of the lever and shoes is noted as shown in figure 5.

The content contained in this article is for entertainment and informational purposes only and should not be used in lieu of seeking professional advice from a certified technician or mechanic. We encourage you to consult with a certified technician or mechanic if you have specific questions or concerns relating to any of the topics covered herein. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content.

Share
Rear brake shoe performance and wear can be adversely affected if the parking brake is not releasing properly. Often this is not discovered until the brakes are replaced a..." addthis:twitterVia="wagnerbrake" addthis:twitterDescription="Ford Light Truck Rear Drum Installation Problems or Severe Brake Drag">
Related Tips
{{lede.date | date:'dd-MMM-yyyy'}}{{lede.tags.length > 0 && lede.date ? ' | ' : ''}}{{lede.tags.join(', ')}}
loading...
loading...

OTHER PARTS FOR YOUR VEHICLE

Wagner® offers a wide variety of products for all of your automotive needs. Check them out today!