Parts for your 2015 Toyota Bb-Rack boots

2015 Toyota bB rack boots: what they do and how to look after them

Based on the Toyota bB (QNC20/21/25) Repair Manual, Toyota Electronic Parts Catalogue, and steering gear exploded diagrams used by dealer parts counters, the 2015 Toyota bB runs a rack-and-pinion steering setup with bellows-type rack boots (also called rack gaiters) on both sides of the rack. So yes—rack boots are fitted to this vehicle and are absolutely relevant to routine servicing.

On the 2015 Toyota bB, the rack boots seal and shield the inner tie rods and rack bar from road grime, water, and grit. They help keep the factory grease where it belongs, protect the rack’s internal seals, and prevent premature wear of the inner tie rod joints. When boots split or the clamps loosen, contaminants sneak in and chew through the joint surfaces—leading to play at the wheel, uneven tyre wear, and in the worst case, a shortened life for the steering rack.

Good workshops in Australia and New Zealand will check rack boots at every service or at least every 10,000–15,000 km. If the boots are cracked, swollen, torn, weeping oil/grease, or the clamps are rusty or missing, they should be replaced pronto. Because conditions that damage one side often affect the other, it’s common to replace them as a pair.

Helpful signs and tips:

• Visible splits, perishing, or grease flung outwards on the boot or subframe.
• Clicking/knocking over bumps, vague steering, or irregular tyre wear.
• If an inner tie rod feels loose while the boot is off, plan for an inner tie rod replacement too.

Replacement is straightforward for a trained tech: centre the steering, mark the tie-rod locknut, remove the outer tie rod end, slip off the old boot and clamps, clean and regrease as specified, fit the new boot with new clamps, and refit the tie rod to the marks. If the tie-rod length is disturbed (very common), a wheel alignment check is smart practice. Even if the marks are lined up neatly, many shops still recommend a quick alignment to keep tyre wear in check.

Quality matters here. Choose OEM or a reputable aftermarket boot with proper heat/ozone resistance and the correct bellows length so it doesn’t bind at full lock. Given the bB’s light, city-focused duty and EPS (electric power steering) hardware, intact boots go a long way to quiet, precise steering feel and long component life.

Popular questions about 2015 Toyota bB rack boots

How often should rack boots be replaced on a 2015 Toyota bB?

There’s no fixed interval, they’re a “replace on condition” item. Have them inspected at every service. Many last 5–10 years, but heat, UV, gravel roads, and oil contamination can shorten that. Replace immediately if cracked, torn, swollen, or leaking.

Can rack boots be replaced without needing a wheel alignment?

If the outer tie rod length isn’t disturbed and the locknut marks line up exactly, you might get away without an alignment. Still, best practice is to have the alignment checked—tiny changes can show up as tyre wear or a crooked steering wheel.

What usually causes rack boots to fail?

Age-related rubber hardening, ozone/UV exposure, road debris, and heat from nearby components are common culprits. Oil or grease contamination from leaks can also make the rubber swell and split. Rough roads and frequent full-lock parking manoeuvres don’t help either.