Parts for your 2015 Subaru Legacy-Rack boots

2015 Subaru Legacy (Liberty) Rack Boots — Purpose and Service Advice

Based on Subaru’s factory service manual for the 2015 Legacy/Outback (BN/BS) steering section and Subaru’s genuine parts catalogue, this model uses an electric power steering rack that is fitted with protective rack boots (also called steering gear boots or bellows) on both sides of the rack. Even though the system is electric rather than hydraulic, the boots are very much relevant, they shield the inner tie rods and rack bar from grit, water, and road splash, and help retain the correct lubrication. This applies equally to New Zealand-market Legacy and Australia’s Liberty variants.

The purpose of the rack boots is simple but critical: keep contaminants out and keep the good stuff in. Each concertina-style boot moves as the steering travels lock-to-lock, acting like a flexible barrier. If a boot splits, water and road grit can reach the inner tie rod joint and the rack bar. On an EPAS rack that’s pricey to replace, that’s bad news. A torn boot can also lead to a WoF/RWC fail, so it’s a small part with big consequences.

As part of routine servicing, the rack boots on a 2015 Subaru Legacy should be visually checked every service interval (around 10,000–15,000 km) or at least twice a year. Look for perished rubber, cuts in the pleats, loose or missing clamps, and any sign of ingress (silt, moisture) around the inner tie rod. If replacement is needed, the outer tie rod end is removed, the old boot slid off, and a new boot installed with the correct style clamps. Counting the exposed threads or marking the tie rod helps maintain toe setting, but a wheel alignment is still recommended afterward. Avoid packing the boot with extra grease, follow the Subaru spec and ensure the boot isn’t twisted so it can breathe and move freely. Quality ear-style clamps are preferred over cable ties for a factory-tight seal.

• Watch for symptoms: uneven tyre wear, notchy steering, or visible splits and grime inside the boot.
• Replace boots in pairs if they’re aged similarly, and check inner tie rods for play while in there.
• After fitting, turn lock-to-lock to confirm the boot doesn’t bind and clamps clear all components.

Popular questions about 2015 Subaru Legacy rack boots

How often should the rack boots be inspected on a 2015 Subaru Legacy?
They benefit from a quick look at every service, or roughly every 10,000–15,000 km. Frequent gravel or coastal driving justifies shorter intervals, as salt and grit accelerate rubber ageing.

What are the signs a rack boot needs replacing on this model?
Obvious splits or perishing, damp silt inside the bellows, loose clamps, or grease flung onto nearby components are giveaways. Any play felt at the inner tie rod is also a cue to check the boot and joint together.

Do the wheels need aligning after a rack boot replacement?
Yes, it’s best practice. Even if the tie rod end is counted off and back on, a fresh alignment confirms the toe setting is bang-on and helps protect tyre life.