2018-2024 Audi A5 & S5 Convertible Radiator Support Brace: Front-End Noise and Collision Repair

What is the Convertible-Specific Radiator Support Brace?

On the 2018-2024 Audi A5 Quattro and S5, the front-end structure is built around a large component called the radiator support or lock carrier. However, the Convertible models feature an additional metal reinforcement brace (part numbers 8W7805629 and 8W7805629A) that is not present on the Coupe or Sportback versions. This brace provides extra stiffness to the front of the vehicle to compensate for the lack of a fixed roof, ensuring the front-end components remain properly aligned and reducing chassis flex.

Symptoms of a Damaged Radiator Support Brace

Failure of this brace is almost always caused by a front-end collision or impact with road debris; it does not wear out on its own. Because it is a structural reinforcement part, symptoms can be subtle.

• Front-End Noise: A broken or loose brace can cause rattling, creaking, or clunking sounds from the front of the car, particularly when driving over bumps or uneven roads.
• Visible Damage: The most common symptom is visible damage, such as bends, cracks, or broken mounting points, discovered during a post-collision inspection.
• Panel Gap Issues: In some cases, a damaged brace could contribute to minor misalignment of the hood or the gap between the bumper and fenders, though this is more often caused by damage to the main lock carrier.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no specific recalls or Technical Service Bulletins (TSBs) issued by Audi for this radiator support brace. Failures are related to physical damage, not manufacturing defects.

However, technicians and owners should be aware of related issues that can cause similar symptoms:

• Front End Noise TSB: Audi has issued TSBs (like A4022322059474_3) for rumbling or squeaking noises from the front suspension buffer stops on some B9 models. This noise could be mistaken for a loose or damaged structural component.
🎬 See: Diagnosing and fixing front end clunks
• Coolant Leaks (S5 V6): The 3.0L V6 TFSI engine used in the S5 has a known issue with coolant leaks from the water pump. While unrelated to this brace, any work on the front of the engine provides a good opportunity to inspect the cooling system.

Numerous recalls exist for these vehicles for issues concerning airbags, suspension fasteners, and passenger detection systems, but none involve the radiator support structure.

Buying a Used Radiator Support Brace

A used OEM brace from an undamaged vehicle is an excellent, cost-effective alternative to a new part. Since this is a simple metal bracket, a used one offers the same structural integrity as new, provided it is inspected carefully.

Inspection Checklist:

• Verify Part Number: Confirm the part is stamped with 8W7805629 or 8W7805629A.
• Check for Straightness: Lay the bracket on a flat surface. It should sit perfectly flush with no wobbling. Use a straight edge to check all lengths for any signs of bending or twisting. A bent bracket will not align correctly during installation.
• Inspect Mounting Holes: Look closely at the bolt holes for any cracks, elongation, or stress marks. This is where impact damage is most likely to appear.
• Confirm Donor Vehicle: Ensure the part was sourced from an A5 Quattro or S5 Convertible. Ask the seller to confirm the donor vehicle's body style.
• Surface Condition: Minor surface rust is usually cosmetic and can be cleaned and painted. However, avoid parts with deep, flaking rust that compromises the metal's thickness.

Cost Comparison

Below is an estimated cost breakdown for replacing the convertible radiator support brace. Prices can vary by supplier and location.

Installation Guide

Replacing this brace requires removing the front bumper cover. 🎬 Watch: Step-by-step front bumper removal guide While not mechanically complex, it involves many steps and care to avoid scratching the paint.

• Difficulty: 3 out of 5
• Estimated Time: 2-3 hours
• Tools Needed: T25 and T30 Torx bits, socket set, trim removal tools, flat-head screwdriver.

General Steps:

1. Prepare the Vehicle: Park on a level surface. It may be helpful to disconnect the negative battery terminal if your vehicle has many front-end sensors.
2. Remove Upper Fasteners: Open the hood and remove the plastic radiator support cover and the Torx screws along the top of the grille.
3. Remove Wheel Well Fasteners: Turn the steering wheel to access the wheel wells. Remove the T25 Torx screws holding the fender liner to the bumper.
4. Remove Lower Fasteners: Remove the series of T25 and T30 Torx screws along the bottom edge of the bumper.
5. Detach Bumper Cover: Carefully pull the sides of the bumper cover away from the fenders to release the clips. Have a soft blanket or boxes ready to set the bumper on.
6. Disconnect Sensors: As you pull the bumper cover away, disconnect any electrical connectors for parking sensors, ACC sensors, or headlight washers.
7. Access and Replace Brace: With the bumper cover removed, the reinforcement brace will be visible on the upper radiator support. 🎬 Watch: Front end and radiator support removal Unbolt the old brace, noting the position of all fasteners. Install the new brace and torque the bolts to factory specifications.
8. Reassembly: Reassemble in the reverse order of removal, making sure to reconnect all sensors before fully seating the bumper cover.

Frequently Asked Questions (FAQ)