Parts for your 2015 Toyota Mark x-Rack boots

2015 Toyota Mark X rack boots — purpose and servicing advice

Technical references confirm the 2015 Toyota Mark X (GRX13#) uses rack boots. Toyota’s Electronic Parts Catalogue (EPC) lists a “Boot, Steering Rack” for the GRX130/133 steering gear, and the Toyota Repair Manual for GRX13# includes an inspection step to “check steering rack boots for damage.” The Mark X New Car Features (NCF) publication also specifies a rack‑assist electric power steering (EPS) system that still relies on a rack‑and‑pinion with protective bellows. Aftermarket catalogues for GRX130 likewise offer direct‑fit rack boots, reaffirming they’re standard fitment.

On the 2015 Mark X, the rack boots (also called bellows or gaiters) sit at each end of the steering rack, sealing the inner tie rods and the rack bar from dust, water and road grime. Even though the Mark X runs EPS rather than a hydraulic pump, the boots are just as critical — they keep grit out of the rack bush and inner joint so the steering stays light, quiet and precise. If a boot splits, contaminants can chew out the inner tie rod and the rack seal surfaces, leading to play, knock and premature wear.

For everyday servicing, it’s smart to have the rack boots visually checked at each service or about every 10,000–15,000 km. Look for perished rubber, cracking at the concertina folds, loose or missing clamps, or grease/dirt build‑up. Because the Mark X uses EPS, there shouldn’t be power steering fluid inside the boot, any oily residue typically points to external leaks or road grime mixed with lubricant.

• Replace boots at the first sign of splitting, heavy cracking or if they’ve lost their clamp tension.
• Use quality OE‑style boots and the correct crimp or ear clamps — cable ties often loosen with heat and movement.
• When replacing, support the vehicle safely, mark tie‑rod end positions, and avoid over‑twisting the inner tie rod.
• Seat the boot evenly so the bellows aren’t pre‑stressed at full lock, and re‑secure with proper clamps.
• If a boot failed and let in water or grit, inspect the inner tie rod for play and the rack for roughness, replace affected parts as needed.
• Plan on a wheel alignment if the outer tie‑rod end is disturbed.

Done right, fresh rack boots help the Mark X steer sweetly for years, protecting the rack, bushings and inner joints from the harsh Aussie and Kiwi road conditions.

Popular questions about 2015 Toyota Mark X rack boots

Do all 2015 Mark X models have rack boots?
Yes. Technical references (Toyota EPC, GRX13# Repair Manual, and NCF) show the 2015 Mark X uses a rack‑assist EPS with bellows‑type boots on both sides of the steering rack. They’re essential regardless of electric or hydraulic assist.

How often should rack boots be replaced?
There’s no fixed interval. Inspect them at each service and replace at the first sign of cracking, splits, loose clamps or contamination. Many last years, but harsh climates and road debris can age them faster.

Do you need a wheel alignment after changing rack boots?
If the outer tie‑rod end is removed or the adjustment is disturbed, get an alignment. If you can swap the boot without altering the tie‑rod position, an alignment may not be necessary, but it’s still good practice to check toe.