In a fail-safe brake, springs provide the fundamental braking force. Spring fatigue or breakage can reduce braking torque and compromise load holding. Warning signs include load creep after brake set, longer stopping distances, reduced clamp force, inconsistent engagement, or increased actuator travel needed to release/apply. On some designs, you may also see uneven pad wear if spring force is no longer balanced.
Inspection should include checking spring condition for corrosion, cracking, deformation, and comparing free length or force to OEM specifications. Because springs often work as a set, replacing only one can create imbalance; many OEMs recommend replacing spring packs as a matched set to restore designed torque and symmetry.
If spring force is suspected to be low, do not rely on “it still works.” Perform controlled holding tests at rated load and verify brake torque where possible. In crane safety management, spring condition is a critical compliance and risk-control item.