Parts for your 2020 Mitsubishi Asx-Bump stops

2020 Mitsubishi ASX bump-stops: what they do and when to replace them

Based on technical documentation, bump-stops are absolutely fitted to the 2020 Mitsubishi ASX. The Mitsubishi Motors Service Manual for RVR/ASX/Outlander Sport (2019–2020) identifies a jounce bumper inside the front MacPherson strut assembly (with the dust boot), and a rear bump-stop for the separate rear shock absorber. The Mitsubishi ASA electronic parts catalogue for the GA-series ASX also lists front and rear bump-stop components, and major aftermarket catalogues (KYB, Monroe) supply matching bump-stop/boot kits for this model. So yes—bump-stops are relevant on the 2020 ASX.

On this ASX, the bump-stop is a dense polyurethane foam or rubber buffer. Up front it sits on the strut shaft under the dust boot, at the rear it’s paired with the shock. Its job is to act as a progressive secondary spring at the very end of suspension travel. When the car hits a deep pothole, runs loaded over corrugations, or bottoms out over a speed hump, the bump-stop cushions the impact, controls the last bit of motion, and protects the strut/shock internals and mounting points. It also helps prevent tyre-to-guard contact and keeps alignment more stable under big hits, which drivers notice as less banging, fewer clunks, and a more controlled rebound.

While they’re simple pieces, bump-stops are wear items. Heat, age, oil contamination, and constant flexing can crack or crumble them. If they deteriorate, the car can crash harshly on big bumps, the dampers cop extra punishment, and stopping distances over rough roads can creep up because the contact patch skips.

For servicing a 2020 ASX, it’s smart to inspect bump-stops whenever the struts/shocks are out—typically around 80,000–120,000 km, or sooner if the car tows, carries loads, or lives on rough Kiwi or Aussie roads. Replacement is cost-effective when fitting new struts/shocks or front strut top mounts, as the labour overlaps. Always replace cracked, oil-soaked, or compressed bump-stops, and renew the dust boots at the same time to keep grit off the damper rod. A quality OE-style bump-stop maintains the ASX’s ride comfort and protects suspension investment.

• Signs they need attention: harsh bottoming, clunks on big hits, visible cracking or missing chunks, torn dust boots, or oily contamination.
• Best practice: replace in pairs on the same axle, torque fasteners to spec, and get an alignment after front strut work.

FAQs

How long do bump-stops last on a 2020 ASX?
In typical Aussie and NZ driving, they’ll often run 8–10 years or 100,000–150,000 km. Heavy loads, rough gravel, or leaking shocks can shorten that. If the struts or shocks are due, it’s sensible to do bump-stops and dust boots at the same time.

What are the symptoms of worn bump-stops?
Expect a sharper, harsher thud on big bumps, a knock near full compression, or a “springy” rebound feel. A visual check may show splits, missing pieces, or perished foam. Torn boots and oily film on the damper rod are common clues too.

Can the ASX be driven with damaged bump-stops?
It’ll still drive, but it’s not ideal. Bottoming impacts get harsher, which can fatigue strut mounts and shorten damper life. Replacing them is inexpensive insurance for ride quality and component protection.