die Hinterachse
rear axle
The axle of a vehicle that connects and supports the rear wheels.
In der Werkstatt wurde ein Schaden an der Hinterachse des Wagens festgestellt.
At the repair shop, damage to the car's rear axle was found.

rear axle
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rear axle
The axle of a vehicle that connects and supports the rear wheels.
In der Werkstatt wurde ein Schaden an der Hinterachse des Wagens festgestellt.
At the repair shop, damage to the car's rear axle was found.

The word is a clear compound of 'hinter' (rear/behind) and 'Achse' (axle). So it literally refers to the axle located at the rear of the vehicle.
Beim Überfahren des Bordsteins wurde die Hinterachse beschädigt.
The rear axle was damaged when the car drove over the curb.
In connection with repairs, this word is often used with verbs such as 'überprüfen' (to check), 'reparieren' (to repair), or 'austauschen' (to replace). A common phrasing is also 'ein Schaden an der Hinterachse' (damage to the rear axle).
Die Werkstatt muss die komplette Hinterachse austauschen.
The repair shop has to replace the entire rear axle.
Although 'Hinterachse' (rear axle) is a technical term from vehicle mechanics, it is also used in everyday speech when talking about car problems or repairs.
Ich glaube, mit der Hinterachse meines Autos stimmt etwas nicht.
I think something is wrong with the rear axle of my car.
axis / axle
'die Achse' and 'die Hinterachse' both belong to vehicle technology. 'die Achse' is the more general word. It can mean any axle, including a front axle or an axle on a machine. 'die Hinterachse' is more specific and means only the axle at the rear wheels of a vehicle. Learners may confuse the words because a rear axle is also an axle. If it is not important where it is located, 'Achse' is enough. If you are talking about the rear part of a car or bicycle, 'Hinterachse' is more precise.

Die Hinterachse macht Geräusche, wenn das Auto langsam fährt.
The rear axle makes noises when the car is moving slowly.
Nach dem Unfall muss die Werkstatt die Achse prüfen.
After the accident, the repair shop has to check the axle.