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What is the job of U-bolts in a leaf spring suspension, and why are loose U-bolts serious?
- A.They adjust the ride height for looks
- B.They connect the air lines to the axle
- C.They clamp the spring pack to the axle; looseness lets the axle shift, changing steering geometry and risking separation
- D.They hold the mud flaps in place
Correct answer
C. They clamp the spring pack to the axle; looseness lets the axle shift, changing steering geometry and risking separation
Why
The axle is located by that clamp, and a shifted axle makes the truck dog-track, scrubs tires, and can break free under braking torque. Rust streaks and shiny marks at the U-bolts are early warnings worth reporting.
Manual topic: Suspension - U-Bolts · From the General Knowledge practice bank (GK-226).