Parts for your 2018 Mazda 3-Rack boots

2018 Mazda 3 rack-boots: purpose, fitment and service advice

Yes — rack-boots are absolutely fitted to the 2018 Mazda 3. Technical sources including the Mazda Workshop Manual for BM/BN models (Steering: Steering Gear and Linkage – Exploded View/Removal–Installation) and Mazda’s Electronic Parts Catalogue for the 2018 MY list the steering gear “dust boot” (also called a rack boot or gaiter) with matching clamps on both ends of the electric rack-and-pinion steering gear. These boots sit over the inner tie rods and the rack ends, sealing out road grime and moisture.

On this Mazda 3’s electric power steering, the rack-boots do the same crucial job they’ve always done: keep water, grit and dust off the polished rack bar and inner tie-rod joints, and hold the correct lubricant where it’s needed. When a boot splits, contaminants can chew out the inner tie-rod ball joint and the rack seal in short order — that’s how a cheap rubber boot becomes an expensive steering rack replacement.

As part of regular servicing, the boots should be visually checked from lock to lock. Any cracks, splits, perishing, loose clamps, or signs of grease flung onto the inside of the wheel or guard means replacement is due. Because removing tie-rod ends to fit boots can alter toe, it’s smart to budget for a wheel alignment afterwards. New clamps should always be used, and the boot must sit correctly in its grooves without being twisted or stretched.

Most owners won’t have a set replacement interval — it’s condition-based. In Australian and New Zealand conditions (heat, UV, road grime), many boots start to harden by the 6–8 year mark or around 100–150,000 kilometres. If the car sees a lot of gravel or coastal roads, inspect more often. A tidy set of boots helps protect the EPS rack motor’s seals and keeps the steering feel consistent.

• Common signs a rack-boot needs attention:
  • Grease mist or splatter on the inner rim or guard
  • Visible cracks, tears, or a boot that’s come off its groove
  • Notchy steering or clunks on small bumps
  • WOF/RWC fail notes for “split steering rack boot”

Bottom line: the 2018 Mazda 3 does use rack-boots, and keeping them in good nick is cheap insurance for the steering gear.

Popular questions about 2018 Mazda 3 rack-boots

How often should rack-boots be replaced on a 2018 Mazda 3?
There isn’t a fixed interval — they’re replaced on condition. Have them inspected at every service. In local conditions, many last well past 100,000 km, but UV, heat and gravel use can age them faster. Replace at the first sign of cracking, splitting, or loose clamps.

Can the car be driven with a split rack-boot?
It’ll still steer, but it’s not a good idea. A torn boot lets in water and grit that can quickly wear the inner tie rod and rack seals. Short trips to the workshop are usually fine, but delaying repair risks a much costlier steering gear replacement.

Do both sides need new boots if only one is torn?
Not always, but it’s common to replace them as a pair due to similar age and exposure. Doing both sides can save labour and helps keep steering feel even across the front end.