Parts for your 2018 Lexus Is-Rack boots

2018 Lexus IS rack boots: what they do and how to look after them

Rack boots are absolutely fitted to the 2018 Lexus IS. The Lexus repair manual (Toyota/Lexus TIS) for the XE30 series, along with the Toyota/Lexus Electronic Parts Catalog, lists bellows-style steering rack boots on both sides of the electric power steering rack. Workshop procedures cover inspection and replacement of the boots and their clamps, confirming they’re standard equipment across the IS range (including RWD and AWD variants).

On this model, the rack boots (also called bellows) sit over the inner tie rods and the ends of the steering rack. Their job is simple but vital: keep dust, water, road grit and spray away from the rack bar and inner joints, while allowing the rack to move freely. By sealing the moving parts, they help prevent corrosion and abrasive wear that can make the steering feel notchy and, left unchecked, can damage the rack assembly — a much pricier fix.

They’re a classic “inspect every service” item rather than a set-kilometre replacement. A quick look with the front wheels turned lock-to-lock will usually show up any splits, perishing or loose clamps. If a boot is torn, it should be replaced straight away. Driving around with a split boot lets water and grit inside, which can chew out the inner tie rod and the rack surface. In Australia and New Zealand, a visibly damaged rack boot can also lead to a failed roadworthy or WOF.

When replacing rack boots on a 2018 Lexus IS, it’s good practice to mark the tie rod end position, but plan on getting a wheel alignment afterwards — it’s the only way to be sure toe is spot on and the tyres won’t scrub. Use OE-style clamps (not cable ties), make sure the boot sits in its grooves without twists, and avoid contaminating the rubber with petroleum-based grease or solvents. If water or grit has got inside, the inner tie rod joint should be checked for free play and the rack surface inspected before refitting the new boot.

• Tell-tales a boot needs attention: visible cracks or tears, grease or grime flung onto the subframe, or a dusty “track” on the rack bar.
• Service tip: inspect at every service or at least every 10,000–15,000 km, and after any suspension or steering work.

Bottom line: healthy rack boots help the IS keep its precise, quiet steering feel and protect against big-ticket steering repairs.

FAQs

Does the 2018 Lexus IS have rack boots?
Yes. The Lexus IS (XE30) uses an electric rack-and-pinion steering gear with bellows-type rack boots on both sides, as shown in the Lexus service manual and the Toyota/Lexus Electronic Parts Catalog.

How often should rack boots be replaced on a 2018 Lexus IS?
There’s no fixed interval. They should be inspected at every service and replaced immediately if split, perished or if clamps are loose. Many last years, but once damaged, replacement is urgent to protect the steering rack.

Is it safe to drive with a torn rack boot?
It’s not recommended. A torn boot can let in water and grit, accelerating wear of the inner tie rod and rack bar. That can lead to expensive repairs and may fail a roadworthy/WOF check. Replace the boot and get an alignment as soon as possible.