Parts for your 2008 Lexus Is-Rack boots

2008 Lexus IS rack boots: what they do and when to replace them

Yes, rack boots are fitted to the 2008 Lexus IS. Technical references including the Lexus IS (XE20: IS 250/350/IS F) Repair Manual – Steering section, and the Toyota/Lexus Electronic Parts Catalogue for GSE20/21/25 and USE20 variants, show a rack-and-pinion steering gear with bellows-type rack boots on both sides of the rack.

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 to keep dust, water, and road grit out of the rack while allowing the tie rods to move freely lock-to-lock. They also help retain the correct grease around the inner joints and provide a small air chamber that equalises as the steering is turned. Most 2008 IS models use electric power steering, and even with EPS the boots are critical—contamination can damage rack seals, inner joints, and components mounted on the rack housing.

As part of regular servicing, rack boots deserve a quick check. A split, perished, or oil-soaked boot (on hydraulic-assist variants in some markets) is a red flag. If dirt gets in, inner tie rods wear fast, the rack can develop play, and the car may fail a WOF or roadworthy. The workshop should inspect the boots at each service interval, especially if the car sees lots of gravel, coastal air, or floodwater.

• Look for cracks, tears, loose or missing clamps, and grease or grit inside the folds.
• If a boot is damaged, replace it in pairs where practical, and always fit new clamps.
• Avoid twisting the boot during install, centre the steering first and equalise the air volume between sides if specified.
• Check inner and outer tie rod play while the boot is off, replace worn joints.
• If any tie rod length is disturbed, book a wheel alignment straight after.

There’s no hard replacement interval, but many originals last 8–12 years in gentle use. In Aussie and Kiwi conditions—heat, UV, and the odd unsealed road—earlier replacement isn’t unusual. Genuine or high-quality OEM-equivalent boots with proper ear clamps are the go, cable ties won’t hold like the right hardware. Keeping the rack boots in good nick helps the IS steer crisply, keeps road noise down, and protects some very pricey steering gear.

Popular questions

How often should rack boots be replaced on a 2008 Lexus IS?
There’s no set kilometre interval. They should be inspected at every service and replaced when cracked, split, or loose. In harsh conditions or with lots of lock-to-lock parking work, expect earlier wear compared with gentle highway use.

Will a torn rack boot fail a WOF or roadworthy?
Quite possibly, yes. A split boot allows contamination into the steering linkage, which is a safety concern. Many inspections in Australia and New Zealand will ping a torn or unsecured rack boot.

Do I need a wheel alignment after replacing a rack boot?
If the inner or outer tie rod adjustment was touched, absolutely get an alignment. If the boot was swapped without altering tie rod length, it may track straight—but it’s still smart to check alignment to protect tyres and steering feel.