Audi A4 Front Suspension Strut: Specs, Fitment & Common Faults
A genuinely well-documented, real fault: a top mount bearing issue, demonstrated with a specific bonnet-open lock-to-lock test — plus an alarming account of a dealer's steering rack quote that every independent mechanic found nothing wrong with.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — front struts (aftermarket) Bilstein 19-171593 / KYB 341719
| Front strut / shock absorber (aftermarket) | B8: Bilstein 19-171593 and 19-171616 (B4, twin-tube gas); Bilstein 24-145961 (B6) and 24-145985 (B8 Performance Plus), monotube gas; KYB 341719 (Excel-G); Meyle 126 623 0020 (pairs, with spring seat); TRW JGM1084T / JGM1086T (54 mm). B9: Bilstein 24-275019 (49 mm clamp) and 24-279451 (53 mm clamp), B4 monotube; KYB 3418009 (Excel-G, 14 mm rod); Meyle 126 624 0007 |
|---|---|
| Front lower arm / wishbone (aftermarket) | LH Lemförder 37486 01 (aluminium); RH Lemförder 37487 01 (aluminium); LH febi 44270 (without ball joint, pair 44271); LH Ridex 273C0640; RH Ridex 273C0746 (with ball joint) and 273C1038 |
| Top mount / strut bearing (aftermarket) | Lemförder 34907 01 (no bearing); Sachs 802 514 (no bearing); Meyle 100 641 0010 (no bearing, pairs); febi 32635 and 33719 (elastomer, no bearing); Ridex 1180S0101 (RH) |
| Genuine (OE) numbers quoted | Lemförder 34907 01 and Sachs 802 514 top mount: 8K0 412 377 C, 8K0 412 377 A. None quoted for struts or arms. (B9 not covered for arms or mounts.) |
| Fitment notes | B8 has standard twin-tube B4 plus B6 and B8 sport options |
Audi A4 Front Suspension Strut: The System That Quietly Does All the Work
On the Audi A4, these components absorb every pothole, bump and cornering force before any of it reaches the cabin, which is why deterioration here rarely announces itself with one obvious symptom. Working through it methodically finds the actual cause faster than guessing ever will.
Audi A4 Front Suspension Strut: What It Does
The Audi A4's front strut does two jobs in one unit — damping the suspension's movement and providing the coil spring's mounting point. Wear here shows up as excessive bounce after bumps rather than a quick settle, and left long enough, uneven tyre wear tends to follow.
Audi A4 Front Suspension Strut: Watch: Replacing It
B9 alt: https://www.youtube.com/watch?v=L6yOH5_EUj8 (Audi A4 Front Shock Absorber Replacement DIY 2017-2024 B9)
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A Genuinely Well-Documented, Real Fault Worth Knowing About — Audi A4 Front Suspension
If you're hearing a knock from the front suspension, this is genuinely worth knowing: documented cases describe this fault traced to the top suspension mount bearing, with a specific test worth trying: with the bonnet open and an assistant turning the steering wheel from lock to lock while stationary, the source of the noise becomes very evident. It's also worth knowing this specific fault is well known for mysteriously failing to reproduce during a dealer's own test drive, despite occurring reliably otherwise.
It's also genuinely worth knowing that this kind of knock can be temperature-sensitive, failing to reproduce during a cold morning test only to become clear and loud after around twenty minutes of driving — worth insisting on a properly extended test drive.
Audi A4 Front Suspension Strut: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Front Suspension Strut Guide for symptoms of worn bushings and ball joints, confirming fitment against your VIN, and rubber vs polyurethane guidance.
More Audi Front Suspension Strut
The same part, covered across other Audi models.