Parts for your 2020 Holden Colorado-Bump stops

2020 Holden Colorado bump-stops — what they do and when to replace them

Yes, bump-stops are fitted to the 2020 Holden Colorado (RG). Technical sources confirming this include the Holden/GM RG Colorado Service Manual (2017–2020) which details “Jounce Bumper Replacement” in the front suspension section and “Rear Axle Bump Stop Inspection/Replacement” in the rear suspension section, as well as GM’s Electronic Parts Catalogue listing both front jounce bumpers and rear axle bump-stops for MY20 Colorado. Common aftermarket fitment guides for the RG Colorado (e.g., SuperPro, Nolathane, OE replacement catalogues) also list direct-replacement bump-stops front and rear.

On this ute, bump-stops act as the last line of defence when the suspension compresses hard — think big pothole, loaded tray, towing, or a quick off-road hit. They cushion the final part of the suspension travel to prevent harsh metal-to-metal contact, protect shocks and control arms, and help stabilise the vehicle under heavy loads. Up front, the jounce bumpers support the control arm/strut assembly at full compression. At the rear, the axle bump-stops limit leaf-spring wrap and keep the diff housing from kissing the chassis when you’re carrying gear or a towball download.

Because they’re usually rubber or microcellular urethane, they can crack, perish, or take a compression “set” over time — especially if they’ve lived a hard life with red dust, oil mist, or UV. A quick inspection at each service is a smart move.

• Look for splits, missing chunks, or a shiny “hammered” face.
• Listen/feel for harsh bottoming, clunks, or a jarring hit over big bumps.
• Check clearances if you’ve fitted a lift, bigger tyres, or a GVM upgrade.

Replacement is straightforward: the rear units typically bolt to the chassis above the axle, the front jounce bumpers mount to the arm/tower depending on variant. Use new hardware if specified, clean the mounting face, and torque to spec from the workshop manual. It’s best done on level ground with the suspension supported correctly. If you’ve changed ride height or shocks, consider progressive-rate bump-stops to smooth out big hits and protect the new gear.

Service tip: include bump-stops in your regular suspension check (every 10,000–15,000 km or at each service interval). If a stop is cracked, oil-soaked, hardened, or missing, replace it in pairs on the same axle to keep handling predictable. It’s a low-cost part that can save shocks, springs, and mounts from pricey damage.

Popular questions about 2020 Holden Colorado bump-stops

Do the 2020 Colorado’s front and rear ends both have bump-stops?
They do. The front uses jounce bumpers integrated with the control arm/strut assembly, and the rear has chassis-mounted stops above the live axle. Both are there to cushion full compression and protect suspension components when the ute is loaded or hits rough tracks.

How often should bump-stops be checked or replaced?
Check them at every routine service or before/after big trips. In normal use, they may last years, heavy towing, corrugations, or lifts can accelerate wear. Replace if they’re cracked, perished, deformed, or missing. Always match replacements to your ride height and load needs.

Will upgraded bump-stops improve ride and control when towing or off-road?
Yes, quality progressive bump-stops can take the sting out of big hits, reduce bottoming, and keep the chassis happier under towball download or payload. They’re not a fix for worn shocks or sagging springs, but they’re a great complement to a well-matched suspension setup.