Parts for your 2007 Toyota Bb-Rack boots

2007 Toyota bB rack boots: what they do and when to replace them

Technical references such as the Toyota service manual and Toyota Electronic Parts Catalogue for the 2007 bB (QNC20/QNC21) show a rack-and-pinion steering setup with bellows-style steering gear boots on the inner tie rods. That means rack boots are absolutely relevant and fitted to this model.

On the 2007 Toyota bB, rack boots (also called steering rack bellows) are the flexible, concertina-style rubber sleeves that seal each end of the steering rack where the inner tie rods live. Their job is simple but critical: keep grit, road splash and moisture out, keep the rack’s grease where it belongs, and protect the moving joints from premature wear. When they’re intact, steering stays precise and the rack’s internals last the distance.

When a boot splits or perishes, contaminants sneak in and the grease gets flung out. That can lead to inner tie rod wear, corrosion on the rack bar, sloppy steering, uneven tyre wear and knocks over bumps. In Australia and New Zealand, a torn rack boot is a common fail item at a roadworthy/WOF check because it directly affects steering safety.

As part of routine servicing on a 2007 bB, the rack boots deserve a quick look every 10,000–15,000 kilometres or at each service. Tell-tales of trouble include visible cracks, grease sling on nearby components, loose or missing clamps, or pooling water/dirt inside the boot. Even with electric power steering variants, the boots must be dry and intact, any oiliness suggests other issues that also need attention.

Replacement is straightforward for a competent technician and is often done alongside an alignment:

• Note toe settings/turn-count on the outer tie rod to preserve alignment.
• Remove the outer tie rod end, slide off the damaged boot and clean the rack area.
• Fit a quality EPDM boot sized for the bB and secure with proper clamps (avoid cable ties).
• Reinstall the tie rod end to the marked position, torque correctly and book a wheel alignment.

Quality matters here. Genuine or reputable aftermarket boots in EPDM rubber handle heat and ozone better, lasting longer than cheap universal options. If there’s any play at the inner tie rod while the boot is off, it’s smart to replace that joint at the same time to save a second alignment.

To keep them happy, avoid blasting the boots with solvent or degreaser, repair any missing guards that expose the rack to road spray, and recheck after deep water crossings. Look after the rack boots and the bB’s steering stays tidy, light and predictable for many years.

Popular questions about 2007 Toyota bB rack boots

How can someone spot a failing rack boot on a 2007 Toyota bB?

They’ll often notice cracks in the folds, a split that opens when the wheels are turned, or grease sprayed around the lower control arm or subframe. During a service, gently squeezing the boot can reveal trapped water or grit, which means replacement is due.

Is it safe to keep driving a 2007 bB with a torn rack boot?

It’ll still steer, but it’s not a good idea. A torn boot quickly turns into inner tie rod wear and potential rack damage, which drives up costs and may fail a roadworthy/WOF. Replacing the boot promptly and getting an alignment is the safer, cheaper play.

Are the rack boots the same across all 2007 bB variants?

Many QNC20/QNC21 bB variants share the same boot style, but fitment can vary by build date and steering gear supplier. Matching by VIN or chassis code is the sure-fire way to get the correct boots and clamps.