Lifts fail in order. Braun and Ricon lifts sequence every motion through switches — nothing moves until the previous motion finishes and reports in. So diagnosis is never "why is it dead"; it's "which link in the chain didn't close."
1. Check the vehicle interlock first
Most installs won't power the lift unless the transmission is in park and (on many buses) the door is fully open with its switch made. A misadjusted door switch strands more lifts than any hydraulic failure.
2. Listen at the pump
Press deploy. Motor runs + no motion = hydraulics (fluid, coupling, valve). No motor sound = electrical (breaker, power harness, pendant, interlock).
3. Find the last completed motion
If the lift unfolds but won't lower, the unfold-complete switch is suspect. If it lowers but the rollstop won't open, the floor-level switch is suspect. The switch AFTER the last good motion is your target — jump it only to confirm, never to operate with a passenger.
4. Check the gas springs before condemning electronics
A weak gas spring lets a barrier sag out of its switch's range, and the lift "randomly" stops. Common on lifts 5+ years old, cheap to fix.
5. Manual backup
Every lift has a manual pump/release for emergencies. If you're using it daily, the lift is failing pre-trip — fix it; don't normalize the backup.
Parts this guide covers: switches & sensors, gas springs, pumps & motors, pendants.
Frequently asked questions
Lift works at the shop, fails on route.
Intermittent = connections or marginal switches: chafed harness at pivots, pendant cord strain relief, corroded floor-level microswitch. Wiggle-test each while cycling.
Breaker trips mid-cycle.
Motor drawing hard (low fluid, binding pivot, overloaded platform) or a harness short at a pivot point.
Written by the parts team at Don Brown Bus Sales, a school and commercial bus dealer since 1978. We install and service lifts, stock the parts, and answer the phone: 518-762-6267.