Parts for your 2003 Toyota Highlander-Rack boots

2003 Toyota Highlander (Kluger) rack boots: what they do and when to replace them

Based on Toyota’s Repair Manual for the 2001–2003 Highlander/Kluger (MCU20/25) steering system and the Toyota Electronic Parts Catalogue, the 2003 Highlander uses a hydraulic rack-and-pinion steering gear with bellows-type rack boots on both sides. These are listed as “steering gear boot/bellows” and shown in the steering gear assembly diagrams. Aftermarket service data (e.g., Haynes/Alldata) also specifies inspection and replacement procedures for the rack boots on this model, confirming the part is fitted and relevant.

The rack boots on a 2003 Toyota Highlander (known as Kluger locally) do a deceptively important job. They’re the concertina bellows on each end of the steering rack that keep road grit, water, and mud out, while keeping grease where it belongs around the inner tie rods and rack bar. By sealing the moving bits, the boots help the power steering rack last longer and steer smoothly without that sandy, notchy feel.

During regular servicing, it pays to give the boots a good look. Aussie and Kiwi conditions—UV, heat, gravel roads, coastal moisture—can crack the rubber over time. If a boot is split, dirt can chew through the rack and inner tie rod quickly, and if there’s oil pooling inside a boot, that points to an internal rack seal leak that a new boot alone won’t fix.

• What to watch for: cracks, splits, perished rubber, loose or rusty clamps, wet/oily residue inside the boot, or steering that feels gritty or inconsistent.
• When replacing: it’s smart to do both sides if one has failed, and check inner tie rod play while you’re there.

Replacement is straightforward for a pro: remove the tie rod end, slide off the old boot, clean the rack bar, then fit the new boot with proper ear clamps—not cable ties—and ensure the boot isn’t twisted. Counting tie-rod threads or measuring helps keep toe close, but a wheel alignment afterwards is the right call to protect tyres and handling.

Two extra tips the techs swear by: don’t swing the steering from lock to lock with a boot off (you can nick the seal lips), and make sure the boot can breathe—some have a tiny vent or equalise when the clamps are set—so it doesn’t balloon or collapse. With fresh, correctly clamped boots, the Highlander/Kluger’s rack is better protected, steering stays precise, and long-term costs are kept nicely in check.

Popular questions about 2003 Toyota Highlander rack boots

Does the 2003 Toyota Highlander (Kluger) have rack boots?
Yes. It uses a rack-and-pinion power steering assembly with a bellows-style rack boot on each side. They shield the inner tie rods and rack bar from grit and moisture and help the steering feel stay smooth.

Do rack boots need regular replacement?
They’re not a scheduled replacement item by kilometres alone, but they should be inspected at each service. Replace them if they’re cracked, torn, perished, or if clamps are loose. In harsher climates or with frequent unsealed-road driving, they tend to age faster.

Will a rack boot change require a wheel alignment?
It’s strongly recommended. Even when the tie rod end is counted back to the same position, small differences can nudge toe out of spec. An alignment protects tyres and keeps the Highlander/Kluger tracking straight.