Parts for your 2018 Subaru Impreza-Bump stops

2018 Subaru Impreza bump-stops: what they do and when to replace them

Technical sources confirm the 2018 Subaru Impreza does use bump-stops. The Subaru Factory Service Manual for the 2018MY Impreza (GK/GT platform) lists a “jounce stopper/bump stop” for both front struts and rear dampers in the Suspension section, and the Subaru Genuine Parts Catalogue for this model shows dedicated bump-stop components within the front strut and rear shock assemblies. That means bump-stops are absolutely relevant to servicing a 2018 Impreza.

On this Impreza, bump-stops are dense foam buffers tucked under the dust boots on the damper shafts. They act like a secondary spring when the suspension nears full compression. Their job is to soften hard hits, stop metal-to-metal contact, protect the strut or shock internals, and help keep the tyres from striking the guards under big bumps or heavy loads. They also stabilise the car in quick direction changes by progressively adding rate as travel runs out, which keeps the handling tidy and helps the alignment stay in check over rough roads.

As part of routine servicing, it’s smart to inspect bump-stops whenever the wheels are off, or at major intervals such as 60,000–100,000 kilometres, and definitely any time struts or shocks are replaced. The foam can harden, crack, or crumble with age, heat, and oil exposure from a weeping damper. If the bump-stops are perished or missing, expect a harsher thud over speed humps, more bottoming-out on potholes, and potential damage to the dampers or top mounts.

• Replace bump-stops in axle pairs (both fronts or both rears) to keep ride and handling balanced.
• Renew the dust boots at the same time, they shield the bump-stop and damper shaft from grit and UV.
• If the car is lowered, match the bump-stop length to the reduced travel (shorter, firmer units may be required). If it’s lifted or regularly loaded, ensure suitable travel and consider uprated components.
• After any suspension work, get a wheel alignment to keep tyre wear and road feel on point.

Done right, fresh bump-stops help the Impreza ride quietly, protect pricey suspension bits, and keep the grip predictable on Kiwi and Aussie roads alike.

Popular questions about 2018 Subaru Impreza bump-stops

How can someone tell if their Impreza’s bump-stops are worn?
Look for cracking, splits, or missing chunks in the foam under the dust boot. On the road, signs include a sharp bang when hitting speed humps, frequent bottoming on rough streets, or new clunks from the strut/shock area. If a damper is leaking oil, assume the bump-stop and boot have been compromised.

Is it safe to drive without bump-stops?
Not really. Without them, the suspension can smash into its limits, damaging the strut or shock and transferring harsh loads into mounts and bodywork. It also hurts handling predictability near full compression. If a bump-stop is missing or perished, it’s best to sort it promptly.

Should bump-stops be replaced when fitting new shocks or struts?
Yes, it’s good practice. They’re inexpensive compared with the labour involved, and fresh bump-stops and boots help protect new dampers, keep the ride quiet, and maintain proper suspension travel.