Final answer:
Pulling brakes are typically caused by issues such as mismatched lining or drums, loose lining, broken park brake springs, or incorrect slack adjuster length, all of which can result in uneven brake application and vehicle pulling to one side.
Step-by-step explanation:
A typical cause of pulling brakes would include a number of potential issues that result in the vehicle veering to one side when the brakes are applied. Some of the main causes for this can be mismatched lining or drums, loose lining, brake blocks, or shoes, broken park brake springs, and incorrect slack adjuster length. If the brake linings or drums are mismatched, this could lead to one side gripping more strongly than the other, causing a pull to the side with the stronger grip. Similarly, loose linings could cause a fluctuation in gripping power during brake application. Broken park brake springs can lead to a lack of retraction on the park brake mechanism, causing dragging on one side. Lastly, if the slack adjuster is of incorrect length, it could result in uneven application of the brakes between the two sides of the vehicle.