Parts for your 2018 Mitsubishi Asx-Rack boots

2018 Mitsubishi ASX rack-boots: what they do and when to replace them

Technical sources confirm the 2018 Mitsubishi ASX does use rack boots (also called steering rack bellows or gaiters). Mitsubishi Motors’ service literature for ASX/RVR/Outlander Sport (2018MY, Group 37: Steering – Steering gear and linkage) illustrates bellows fitted to each end of the rack-and-pinion. The Mitsubishi ASA electronic parts catalogue for ASX likewise lists steering gear bellows and clamps as service parts. Independent OEM catalogues for the 2018 ASX/Outlander Sport also specify dedicated rack-and-pinion bellows kits. Because the ASX runs a rack-and-pinion setup (with electric power assist), boots are necessary to protect the inner tie rods and rack from dust, water, and grit.

On the 2018 ASX, the rack boots seal the moving bits of the steering rack from the Aussie and Kiwi elements. They keep grease in, keep contamination out, and let the bellows expand and contract as the steering moves. If a boot splits, the inner tie rod joint can chew out quickly and the rack itself can corrode, leading to knocky steering, uneven tyre wear, and potential WOF/RWC trouble.

As part of regular servicing, it’s smart to have the rack-boots checked at each service or at least every 10,000–15,000 km, especially if the ASX sees gravel roads, beach launches, or outback dust.

• Inspect for splits, perishing, or loose/missing clamps. Look for grease spray on the subframe or crossmember.
• If a boot is torn, replace it promptly. Replace in pairs where practical, and always fit new clamps.
• When installing, centre the rack, don’t twist the boot, and ensure the bellows aren’t kinked at full lock both ways.
• Use quality OE-equivalent bellows, avoid generic zip ties—proper clamps keep a reliable seal.
• If an inner tie rod has play or corrosion, renew it along with the boot.
• Book a wheel alignment after any rack-boot or inner tie rod work.

Even though the ASX uses electric power steering (no fluid to leak), a failed rack boot can still let water and grit into the inner joints. Catching a split early is cheaper than sourcing a replacement steering rack later. For owners who DIY, use stands and chocks, mark toe settings before disassembly, and follow torque specs from the Mitsubishi service manual. Everyone else can ask their workshop to include a rack-boot check when rotating tyres.

Does the 2018 Mitsubishi ASX have rack boots?
The 2018 ASX uses a rack-and-pinion steering gear with electric assist, and it does have bellows-style rack boots on both ends of the rack. These protect the inner tie rods and the rack from contamination and hold the correct amount of grease.

How long do rack boots last on an ASX?
In normal city and highway use they can last many years, but heat, UV, gravel, and off‑road dust can age the rubber faster. Regular visual checks during services are best, replace at the first sign of cracking, splitting, or loose clamps to avoid damage to inner tie rods or the rack.

Can rack boots be replaced without removing the steering rack?
Yes. On the ASX, the boots are serviceable with the rack in the vehicle. The outer tie rod end is removed, the old boot and clamps come off, and a new boot and clamps are installed. An alignment is recommended afterwards because the tie rod end is disturbed.