What if I don't know the part name or SKU?

Start with the Guided Part Finder: pick the closest symptom, confirm your truck, and PartsNow shows matching parts — or hand off to the assistant.

Do I need my truck year, make, and model?

It helps a lot for fitment. You can use a saved fleet truck, enter year/make/model, or skip and ask the assistant with what you know.

No. It narrows common parts for a symptom. Always confirm fitment before ordering.

Yes — ask the PartsNow assistant in chat, or Continue in Live on the mobile app for camera and voice help.

Yes. PartsNow focuses on heavy-duty truck and trailer parts with cross-references across common OEMs.

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Step 2 of 3

2 / 3

Air leak / losing pressure

Which truck? — optional

Year

Make

Model

Pick make and model to continue.

Where's the leak coming from?

How does pressure behave?

Do you hear a hiss?