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Parts for your 2015 Toyota Bb-Rack boots
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2015 Toyota bB rack boots (steering rack gaiters)
Relevant technical sources confirm the 2015 Toyota bB uses steering rack boots. The Toyota Electronic Parts Catalog (EPC) for the QNC20/QNC21/QNC25 series lists “Boot, Steering Gear” on both sides of the rack, and Toyota’s service information (TIS) steering section covers inspection and replacement of the rack bellows. The related Daihatsu Materia/Subaru Dex workshop references for the shared platform also specify rack-and-pinion boots. So rack boots are absolutely fitted and relevant on the 2015 Toyota bB.
On this bB, the rack boots are flexible bellows that seal the ends of the rack-and-pinion housing where the inner tie rods attach. Their job is to keep dust, water and road grit out, and to keep lubricant in. Even where the bB is equipped with electric power steering, the mechanical rack still relies on these boots to protect the inner tie rods and rack seals.
Cracked or split boots let contaminants attack the inner tie rod joints and the rack itself, which can lead to steering play, knocking, and costly rack replacement. In Australia and New Zealand, deteriorated rack boots are a common roadworthy/WOF fail item.
Good servicing practice for a 2015 bB includes checking the rack boots at every service or at least every 10,000–15,000 kilometres. Look for surface cracking, oil or grease weeping, loose or missing clamps, or damp, gritty buildup on the inner tie rod area. After deep water crossings or lots of unsealed-road driving, check them sooner.
When it’s time to replace, a straightforward boot swap can save a steering rack. A quality OE or equivalent boot in durable rubber or TPE, new clamps, and proper fitment are key. Best practice includes:
- Replace boots in pairs and use new clamps.
- Mark tie rod end positions or measure threads to keep toe close, get a wheel alignment afterwards.
- Check inner tie rods for wear while the boot is off, replace if loose.
- Lightly grease the rack-to-boot contact area as specified, avoid overfilling.
Typical signs it’s overdue: visible splits, a light spray of grease on the inner rim/guard, steering vagueness, or a WOF/roadworthy note. Keeping the rack boots intact helps the bB steer precisely, protects expensive hardware, and avoids premature tyre wear and alignment headaches.
Popular questions
Does the 2015 Toyota bB have rack boots?
Yes. The 2015 bB (QNC20-series) uses a rack-and-pinion steering gear with protective rack boots on both sides, as shown in Toyota EPC and service manual procedures.
How often should rack boots be inspected or replaced?
Inspect every service or 10,000–15,000 km, and after rough or wet off-seal use. Replace at the first sign of cracking, splitting, or clamp failure—there’s no set age, but many last 5–10 years depending on climate and use.
Do you need a wheel alignment after replacing rack boots?
Yes, it’s strongly recommended. Even if you mark the tie rod positions, disturbing the outer tie rod can shift toe. An alignment protects tyres and restores the bB’s straight-line stability.
