Wheel Stud - Front

Replace a damaged or broken front wheel stud on a 2009 Aston Martin DB9, requiring removal of the wheel, brake caliper, and rotor to access and press out the old stud and install a new one.

Warnings

Tools required

Parts

• Front wheel stud × 1 — Use OEM specification for DB9
• Wheel lug nut (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake.
2. Chock the rear wheels to prevent vehicle movement.
3. Loosen the front wheel lug nuts (remaining good studs) 1/2 turn while vehicle is still on the ground.
4. Lift the front of the vehicle at the appropriate jacking point and secure on jack stands.
5. Remove the wheel lug nuts and remove the front wheel to access the brake assembly.

Procedure

1. 1

   Remove brake caliper mounting bolts
   Locate the two brake caliper mounting bolts on the rear of the caliper assembly. Verify the exact caliper mounting bolt size and head type against Aston Martin service documentation before removal. Remove both bolts and carefully lift the caliper off the rotor. Support the caliper with a wire hook or bungee cord to prevent stress on the brake hose. Do not disconnect the brake hose unless absolutely necessary. Note: Verify the exact caliper mounting bolt size against Aston Martin service documentation before removal, as DB9 caliper bolts may differ from typical 13mm/14mm hardware. Note: Refer to OEM documentation for the exact caliper mounting bolt size and type for this vehicle (the DB9 is commonly fitted with Brembo calipers, but confirm caliper supplier and bolt size against OEM documentation for this specific VIN).
2. 2

   Remove brake rotor
   If the rotor is held by a retaining screw or clip, remove it. The rotor may be held in place by corrosion or slight lip buildup. Tap the rear of the rotor with a dead-blow hammer to break it free, then slide the rotor off the hub assembly. If the rotor is severely stuck, apply penetrating oil and allow it to soak before attempting removal.
3. 3

   Access the damaged wheel stud
   With the rotor removed, the rear of the wheel hub is now visible. Identify the damaged or broken wheel stud. Inspect the hub face and stud bore for damage or deformation that may have occurred during the stud failure.
4. 4

   Remove the damaged wheel stud
   The wheel stud is typically press-fitted into the hub from the rear — confirm the DB9 hub uses pressed studs rather than bolt-on wheel fasteners before proceeding. Using a brass hammer or dead-blow hammer, strike the front (threaded end) of the damaged stud to drive it rearward out of the hub. If the stud is broken flush or cannot be driven out with a hammer, use a wheel stud press tool or hydraulic press to push it out from the front. Ensure the stud clears the hub bore completely.
5. 5

   Clean the stud bore
   Use a wire brush to clean the stud bore in the hub, removing any rust, debris, or metal shavings. Inspect the bore for cracks or damage. If the bore is damaged or wallowed out, the hub may require replacement. Clean the hub face with brake cleaner.
6. 6

   Install the new wheel stud
   Insert the new wheel stud into the hub bore from the rear (smooth side first, threaded end facing out). The stud should slide in partially by hand. Apply a light coating of anti-seize to the smooth shank of the stud (not the threads or serrations). Using a wheel stud installation tool or stack washers and a lug nut, draw the stud fully into the hub. Thread a lug nut onto the stud, place washers behind the nut, and tighten the nut to pull the stud through until the serrated shoulder seats firmly against the rear of the hub. You will feel resistance increase as the stud seats.
7. 7

   Verify stud installation
   Remove the installation lug nut and washers. Inspect the rear of the hub to confirm the stud shoulder is fully seated and flush against the hub. The stud should not rotate or move when hand pressure is applied. Check that the threaded end protrudes the same distance as the adjacent studs.
8. 8

   Reinstall brake rotor
   Clean the hub face and rotor mating surface with brake cleaner. Slide the brake rotor back onto the hub, aligning any screw holes or locating features. If equipped with a retaining screw or clip, reinstall it to hold the rotor in position during caliper installation.
9. 9

   Reinstall brake caliper
   The DB9 uses fixed opposed-piston calipers, so the pistons should not require retraction if the pads were not removed. Position the caliper over the rotor and align the mounting holes. Position the caliper over the rotor and align the mounting holes. Install both caliper mounting bolts and tighten to the Aston Martin factory-specified torque (verify value in service documentation). Ensure the brake pads are properly seated on either side of the rotor. Note: Install both caliper mounting bolts and tighten to the manufacturer's specified torque (verify exact value in OEM documentation for the 2009 DB9).
10. 10

    Reinstall wheel and torque lug nuts
    Place the wheel onto the hub, aligning the lug holes with all studs including the newly installed one. Thread all lug nuts onto the studs by hand. Tighten the lug nuts in a star pattern to ensure even seating. Lower the vehicle until the tire just contacts the ground (weight not fully on tire). Perform final torque of lug nuts to the Aston Martin factory specification (approximately 115 lb-ft / 155 Nm — verify exact value in service documentation) in a star pattern. Fully lower the vehicle and remove jack stands. Note: Perform final torque of lug nuts to the Aston Martin factory specification (verify exact value in service documentation) in a star pattern. Note: Perform final torque of lug nuts to the manufacturer's specification (verify exact value in OEM documentation for the 2009 DB9) in a star pattern.

Reassembly

1. Torque all fasteners to manufacturer specifications using a calibrated torque wrench.
2. After driving 50-100 miles, re-check lug nut torque to ensure the new stud has properly seated and no loosening has occurred.
3. Pump the brake pedal several times before driving to restore brake pedal firmness after caliper removal.

Verification

• Confirm the new wheel stud is fully seated and does not rotate in the hub.
• Verify all lug nuts are properly torqued and the wheel is secure.
• Test brake pedal feel before moving the vehicle; the pedal should be firm and not travel to the floor.
• Check for any brake fluid leaks around the caliper if the brake hose was disturbed.
• Perform a low-speed test drive and verify normal braking operation and no unusual noises from the wheel area.

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