Front knocking over bumps in hot weather caused by the guide link hydraulic bushings

Engine / equipment

A4 (B8), A5 (8T) and Q5 (8R) with 75 mm hydraulic bushings

Period mentioned

2008–2014

Symptoms

Front knocking or rattling over bumps with the car warm and hot outside, especially when braking at the same time; in the cold it is not heard.

Possible cause described

Heat makes the front guide links' hydraulic bushings noisy (only the 75 mm ones). Audi describes it in bulletin 40 14 39 (February 2014) as a comfort issue that does not affect the car's handling.

Check for the garage

Note whether it only happens in hot weather and when braking over bumps. At the garage, have them check the front guide links' hydraulic bushings before replacing shock absorbers or ball joints.

Cost cited in the source

No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Sources from the original database