Parts for your 2004 Toyota Mark x-Rack boots

2004 Toyota Mark X rack-boots

Referencing the Toyota Mark X (GRX120/GRX125) Repair Manual steering section and Toyota’s Electronic Parts Catalogue (EPC), the 2004 Toyota Mark X uses a rack-and-pinion steering gear with dedicated rubber bellows, commonly called rack-boots or rack gaiters, fitted on both ends of the steering rack. Aftermarket catalogues from well-known brands (e.g., 555/Three Five, Febest, Gates) also list direct-fit rack-boots for GRX120 models. So yes—rack-boots are relevant and fitted to the 2004 Toyota Mark X.

On this Mark X, the rack-boots do a quiet but critical job. They seal the open ends of the steering rack, keeping dust, road grit, and water out while holding a smear of grease around the inner tie-rod ball joints. That protection stops premature wear of the inner joints and corrosion on the rack itself. If a boot splits or perishes, grime and moisture sneak in, which can chew out the inner joint, cause notchy or vague steering, and even let power steering fluid pool inside the boot if an internal rack seal starts weeping. Left too long, that can turn a small fix into a big spend.

As part of regular servicing in Australia and New Zealand, it’s smart to eyeball the rack-boots at each service or at least every 10,000–15,000 kilometres. Look for cracks, oiliness, loose or missing clamps, and any tell-tale grease spray on the inner guards. If one side’s gone, consider doing both—they’ve lived the same life.

• Common signs it’s time: visible splits, perished rubber, wet/oily boots, clunks on turn, uneven tyre wear, or grease flung from the inner tie-rod area.
• Use quality boots and solid clamps rather than cable ties, and keep the boot free of twists so it can flex naturally on full lock.

Replacement is straightforward for a competent DIYer or any workshop: wheel off, split the outer tie-rod end from the knuckle, unwind it, slide the old boot off, clean the rack end and inner joint, refit the new boot with proper clamps, then refit the tie-rod end. Mark the tie-rod position before removal, but always book a wheel alignment afterwards to nail the toe angle. Fresh cotter pins and correct reassembly practice are a must.

Treat the rack-boots as cheap insurance. A good set keeps the steering precise and helps the Mark X sail through a roadworthy or WOF without drama.

Popular questions

Do all 2004 Toyota Mark X models have rack-boots?
Yes. The GRX120/GRX125 Mark X uses a rack-and-pinion steering assembly with rubber bellows (rack-boots) on both ends. This is confirmed by Toyota’s service literature and EPC listings, and mirrored by multiple aftermarket parts catalogues.

How often should the rack-boots be replaced?
There’s no strict interval—replace on condition. Inspect at each service, in local conditions many last years, but heat, age, and road grime can perish them. If a boot is cracked, loose, or oily, replace it promptly to protect the inner tie-rod and rack.

Is it safe to drive with a torn rack-boot?
Short distances might be unavoidable, but it’s not ideal. A torn boot lets grit and water in, accelerating wear. If power steering fluid weeps into the boot, it can mask a bigger issue. Get the boot sorted and check for leaks, then have the alignment done.