Trucks / Pierce
Pierce TAK-4 Independent Suspension
Pierce proprietary independent suspension architecture for ride control, braking confidence, and maneuverability across custom chassis.
Suspension Architecture
TAK-4 was developed from Oshkosh severe-duty suspension work and adapted specifically for Pierce custom fire apparatus. The system centers on independent wheel movement, mechanical-over-hydraulic steering, and larger brake packaging so the truck stays composed over poor pavement, crowned intersections, speed bumps, and other road disruptions that unsettle conventional axle setups.
What You'll Learn From This Page
- IFS, IRS, and T3 configuration summary
- published chassis compatibility and load ranges
- Ride, braking, and maneuverability highlights for apparatus planning
Configuration Matrix
Quick sizing and chassis guidance across the current Pierce lineup.
| System | Supported Chassis | Load Rating | Travel / Steering | Published Takeaway |
|---|---|---|---|---|
| TAK-4 IFS | Enforcer / Impel / Saber / Velocity | 18,000 lb to 24,000 lb | Up to 10 in travel / up to 45 deg cramp | Front-end control, larger brakes, and smoother ride |
| TAK-4 IRS | Enforcer / Impel / Velocity | 24,000 lb to 52,640 lb | Up to 14 in travel / no rear steer | Improved ride quality, traction, and reduced road input |
| TAK-4 T3 IRS | Enforcer / Impel / Velocity | 24,000 lb to 52,640 lb | Up to 14 in travel / mechanical rear steer | Tighter turning radius with reduced tire scrub |
Feature Highlights
Independent Front Suspension
TAK-4 IFS uses torsion bars, independent wheel movement, and dual steering gears to keep the front axle planted and responsive.
- Up to 24,000 lb front axle rating
- Up to 10 in wheel travel
- 17 in ventilated disc brakes called out in the published data
Independent Rear Suspension
TAK-4 IRS transfers the same severe-duty ride philosophy to the rear axles using coil springs and control-arm geometry.
- Available on Enforcer, Impel, and Velocity
- Up to 14 in wheel travel
- published data notes less wear and tear on equipment
T3 Tight Turning Technology
The T3 package adds 100 percent mechanical rear steering to sharpen turning response and reduce wide-swing behavior.
- Available on single and tandem rear axle setups
- Reduced tire scrub is a stated benefit
- Aimed at lane-to-lane turning and tighter turning diameter
Validated Under Harsh Test Conditions
Pierce highlights Transportation Research Center testing with loaded front axles, potholes, staggered bumps, and crowned intersections.
- 24,000 lb front axle test load noted
- 17,700 test miles cited in the published data
- Maintenance simplification is a major part of the value case
Pierce Literature
TAK-4 Independent Suspension overview (March 2025)