Steering & Suspension Inspection

Winter Salt Damage Inspection – What to Check After a Northern Winter

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After a long northern winter, road salt has worked its way into every crevice of the underbody. Spring is the time to inspect the steering and suspension for salt-induced damage before it becomes a summer breakdown. This guide covers what to look for on a 10-year-old daily driver in states that use road salt.

What the driver feels

  1. A new clunk or rattle that appeared after winter
  2. Rust visible on the sway bar or control arms
  3. The steering feels stiffer than usual when cold
  4. Rust flakes falling from under the car
  5. A squeak or groan from the front end in cold weather
  6. Brake lines looking rusty when you look through the wheels
  7. The car pulls to one side after salt-covered roads
  8. Rust on the exhaust and frame visible from behind

Road salt and brine are sprayed on northern roads all winter. On a 2014 Ford Focus or 2015 Chevrolet Cruze driven in Chicago, Detroit or Cleveland, the salt creeps into the steering rack boots, control arm bushings and subframe bolts. The salt accelerates internal corrosion, which causes clunks and stiffness. The sway bar frame bushings also rust-seize to the bar, which causes a clunk when going over bumps in cold weather.

The brake lines are also a safety concern. Salt causes the steel brake lines to rust from the outside in, and a line can burst suddenly. On older northern cars, brake line replacement is a common spring repair. The steering intermediate shaft U-joint also rusts and binds, which causes stiff steering in one direction.

How to inspect it

Safety note: Always set the parking brake and chock the wheels before getting under the vehicle. Use rated jack stands, never rely on a jack alone.

  • After the salt has been washed off, drive the car onto ramps or a lift.
  • Use a wire brush to check the frame rails for bubbling scale rust.
  • Look at the sway bar where it passes through the frame bushings. Rust here means the bushings are seized.
  • Check the steering rack boots for cracking or swelling. Salt inside the boot causes internal rack corrosion.
  • Inspect the brake lines along the frame for rust scale. If the lines flake when touched, they need replacement.
  • Check the subframe mounting bolts for rust. Rusted bolts will break when you try to remove them.
  • Look at the lower control arm inner bushings where they mount to the subframe – a common salt-failure point.

Repair and replacement advice

  • Wash the underbody in spring to remove trapped salt; do not just rinse the body.
  • Rusted sway bar bushings should be replaced, not lubricated, because the bar itself is corroded.
  • Brake lines with surface rust should be replaced proactively; a burst line at highway speed is dangerous.
  • Treat frame rust with a wire brush, rust converter and undercoating before it spreads.
  • Rusted subframe bolts should be soaked with penetrating oil months before any future repair.

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