What can cause an excessively large brake cylinder stroke?

An excessively large brake cylinder stroke means that the brake piston has to move farther than usual to apply the brakes effectively. This can happen if the automatic slack adjuster is defective, because the slack adjuster is responsible for maintaining the correct distance between brake components. If it doesn’t adjust properly, more stroke is needed. Similarly, worn mountings on the transmission system cause play or looseness, which also increases the distance the brake piston must travel. However, excessively high reservoir pressure does not cause a large brake stroke; it affects braking force but not the stroke length. Understanding this helps ensure brakes are effective and safe.