M - Brake Torque Test and Inspection - Mech - All Keystone
Regular brake torque testing and inspection helps verify that brake shoes, disks, springs, and hydraulic systems are in safe working condition, that armature current values are within specified ranges, and that drive-train backstops function correctly. Performing these checks on an unloaded lift reduces the risk of brake failure, improves stopping performance, and supports safe passenger operations.
Keystone - Lifts
12/04/2025
M - Brake Torque Test and Inspection - Mech - All Keystone
This procedure outlines the steps for conducting a monthly brake torque test and inspection for mechanical brakes, focusing on brake shoe condition, system operation, pressure readings, hydraulic levels, torque test, sensor tests, and stopping distance verification. Testing and inspections must not be performed on a loaded lift.
Service Brake Inspection
Check condition of service brake shoes. Replace if worn beyond tolerance.
Assure free open/close movement of service brake(s).
Check operation of service brake open/close switch and brake wear switch.
Check alignment of shoes to high-speed disk and pad gap.
Inspect and clean high-speed disk braking surface.
With brake closed, measure and record spring pre-load on SB1.
With brake closed, measure and record spring pre-load on SB2 (if applicable.)
Torque Test Service Brake
Torque test service brakes per stamped procedure.
Enter armature current value for Service Brake 1.
Confirm Service Brake 1 recorded value is within specified range.
Enter armature current value for Service Brake 2 (if applicable.)
Confirm Service Brake 1 recorded value is within specified range.
Bullwheel Brake Inspection
Check condition of all bullwheel brake shoes. Replace if worn beyond tolerance.
Inspect and clean bullwheel braking flange.
Check alignment of shoes to braking surface and pad gap.
With brake closed, measure and record spring pre-load on EB1.
With brake closed, measure and record spring pre-load on EB2 (if applicable.)
With brake closed, measure and record spring pre-load on RB1.
With brake closed, measure and record spring pre-load on RB2 (if applicable.).
Torque Test Bullwheel Brakes
Torque test emergency and rollback brakes per stamped procedure.
Enter armature current value for Emergency Brakes.
Confirm Emergency Brake recorded value is within specified range.
Enter armature current value for Rollback Brakes.
Confirm Rollback Brakes recorded value is within specified range.
Hydraulic and Fluid Levels
Inspect Hydraulic system.
Check hydraulic fluid levels.
Drive Train Backstop
Does this lift have a Drive Train Backstop?
if the answer is "oneOf [Yes]"
Source: Keystone - Lifts (Community Member)