Brake Rotor - Front Single

Replace a single front brake rotor on a 2009 Aston Martin DB9, including caliper and bracket removal, rotor replacement, and torque-critical reassembly with threadlocker application.

Warnings

Tools required

Parts

• Front brake rotor (single) × 1 — Use OEM Aston Martin specification or equivalent performance grade
• Rotor set screw (if damaged) × 1 — M6 x 1.0mm thread
• Threadlocker medium strength (Loctite 243 or equivalent) × 1 — Use OEM specification

Fluids

• DOT 4 low-viscosity brake fluid — 0.25 qt

Preparation

1. Park vehicle on level, solid ground. Engage parking brake and place transmission in Park (automatic) or 1st gear (manual).
2. Loosen the front wheel lug nuts 1/4 turn while vehicle is on the ground, but do not remove.
3. Raise the front of the vehicle using a floor jack at the designated front jacking point (consult owner's manual for exact location).
4. Place jack stands under the front suspension support points on the side being serviced. Lower vehicle onto jack stands and verify stability.
5. Remove the front wheel completely and set aside in a clean area.
6. Inspect the brake system for fluid leaks, damaged brake lines, or excessive pad wear before proceeding.

Procedure

1. 1

   Clean and prepare fasteners
   Spray penetrating oil on the caliper mounting bolts and caliper bracket bolts. Allow to penetrate for 5-10 minutes. If the rotor is retained by a set screw, clean it with a wire brush to expose the drive; note that some DB9 rotors are floating/two-piece designs that may not use a hub-face set screw—verify retention method before proceeding. The rotor retaining/set screw drive size must be verified by direct inspection against the actual fastener; use the correctly fitting Torx (or hex) bit and verify full engagement before applying force. Note: If the rotor is retained by a set screw, clean it with a wire brush to expose the drive; note that some DB9 rotors are floating/two-piece designs that may not use a hub-face set screw—verify retention method before proceeding. Verify the exact Torx drive size against the fastener before applying force, as the correct size must be confirmed for your specific vehicle. Note: The rotor set screw uses a Torx drive; verify the correct Torx bit size by test-fitting before applying force, and consult Aston Martin service documentation for the exact specification. Note: Thread size per Aston Martin specification (verify against the removed screw) Note: Verify correct OEM Aston Martin rotor part number and specification against official service documentation
2. 2

   Remove caliper mounting bolts and support caliper
   Locate the two caliper mounting bolts that secure the fixed caliper to its mount. Note: the DB9 uses fixed multi-piston calipers (not sliding calipers), so there are no slide pins. These secure the caliper to the bracket. Using the appropriate socket, remove both caliper mounting bolts. Carefully lift the fixed caliper straight off and away from the rotor. Do NOT allow the caliper to hang by the brake hose. Support the caliper using mechanic's wire, hooking it to a suspension component or chassis member to eliminate all strain on the brake hose. Note: Locate the caliper mounting bolts that secure the fixed (opposed-piston) caliper to the bracket or knuckle. Note: Locate the two caliper mounting bolts that secure the fixed opposed-piston caliper to the knuckle (the DB9 uses a fixed monobloc caliper, not a sliding caliper).
   Torque spec

   Caliper Mounting Bolts113 Nm (83 lb-ft)
3. 3

   Remove brake pads
   With the caliper supported, remove both brake pads from the caliper bracket. Note the orientation and position of any anti-rattle clips or shims. Set pads aside if they will be reused, or discard if replacing. Inspect pad wear pattern for uneven contact indicating rotor or caliper issues.
4. 4

   Remove caliper bracket
   If the caliper mounts via a separate bracket, locate the two bracket-to-knuckle bolts; note that on fixed-caliper designs the caliper may bolt directly to the knuckle with no separate bracket. Verify the mounting arrangement against Aston Martin documentation before proceeding. These are larger and torqued significantly higher than the caliper mounting bolts. Use a breaker bar if necessary to break them loose. Remove both bracket bolts completely and remove the caliper bracket from the knuckle. Set bracket aside. Note: If the caliper mounts via a separate bracket, locate the bolts that secure the bracket to the upright/steering knuckle; on many fixed-caliper designs the caliper bolts directly to the upright with no separate bracket, so verify configuration on this vehicle before proceeding. Note: Note: the DB9 typically uses a fixed monobloc caliper bolted directly to the knuckle with no separate pad-carrier bracket. Verify caliper design against Aston Martin service documentation; if no separate bracket exists, this step does not apply.
   Torque spec

   Caliper Bracket Bolts110 Nm (81 lb-ft)
5. 5

   Remove rotor set screw
   The rotor may be secured to the hub face by a single set screw visible through the wheel studs on some applications; verify whether a set screw is present on this vehicle. If present, use the appropriate bit to remove it completely. Using the appropriate Torx bit, remove the rotor set screw completely. If the screw is seized or damaged, carefully drill out and replace with new. Keep the set screw if it is in good condition for reuse. Note: If the rotor is secured to the hub by a set screw, it will be visible on the hub face; verify the retention method against Aston Martin service documentation, as some DB9 rotors use no set screw.
   Torque spec

   Brake Rotor Set Screw9 Nm (7 lb-ft)
6. 6

   Remove brake rotor
   Pull the brake rotor straight off the hub. If the rotor is stuck due to corrosion, use a rubber mallet to strike the rotor face (between the cooling vanes, not the friction surface) or the rotor hat section to break it free. Do NOT strike the friction surface with a metal hammer. If the rotor remains seized, spray penetrating oil at the hub-rotor interface, allow to penetrate, and retry. On some rotors, there are threaded holes in the rotor hat for jacking bolts; if present, thread bolts into these holes to force the rotor off the hub.
7. 7

   Clean hub mounting surface
   With the rotor removed, thoroughly clean the hub face where the rotor mounts using a wire brush and brake parts cleaner. Remove all rust, corrosion, and debris. The hub face must be completely clean and flat to ensure proper rotor seating. Inspect wheel studs for damage and replace if threads are compromised.
8. 8

   Install new rotor
   Place the new rotor onto the hub, aligning the set screw hole with the threaded hole in the hub. Ensure the rotor sits flush against the hub face with no gaps or high spots. If the rotor does not sit flush, re-clean the hub face. Verify the rotor is the correct specification for your DB9 (ventilated front rotor, appropriate diameter and thickness).
9. 9

   Install rotor set screw
   Apply a small amount of medium-strength threadlocker (Loctite 243 or equivalent) to the threads of the rotor set screw (use original if undamaged, or new if replaced), if specified for your vehicle. Thread the set screw into the hub by hand, then torque to specification using a torque wrench. The set screw prevents rotor movement during installation but is not load-bearing during operation. Note: Apply a small amount of medium-strength threadlocker (Loctite 243 or equivalent) to the threads of the rotor set screw (use original if undamaged, or new if replaced). Note: Apply thread preparation to the rotor set screw per Aston Martin specification (typically a light threadlocker or clean dry threads—do not use anti-seize unless specified, as it alters torque values).
   Torque spec

   Brake Rotor Set Screw9 Nm (7 lb-ft)
10. 10

    Clean and prepare bracket bolt threads
    Inspect the threads of the caliper bracket bolts and the threaded holes in the steering knuckle. Use a thread chaser or wire brush to clean all threads. Wipe clean with brake cleaner. Apply medium-strength threadlocker (Loctite 243 or equivalent) to the threads of both caliper bracket bolts per manufacturer requirement.
11. 11

    Install caliper bracket
    Position the caliper bracket onto the steering knuckle, aligning the bolt holes. Thread both caliper bracket bolts by hand to ensure proper thread engagement. Once both bolts are hand-tight, torque the bracket bolts to specification in an alternating pattern (tighten one partially, then the other, then both to final torque). This ensures even clamping force and proper bracket alignment.
    Torque spec

    Caliper Bracket Bolts110 Nm (81 lb-ft)
12. 12

    Install brake pads
    Install the brake pads into the caliper bracket in their original orientation. Ensure any anti-rattle clips, shims, or pad hardware are properly positioned. Pads should slide smoothly in the bracket but without excessive play. If installing new pads, ensure they are the correct specification for the DB9 and compatible with the new rotor.
13. 13

    Install caliper
    Remove the support wire from the caliper. Carefully position the caliper over the brake pads and rotor, aligning the caliper mounting bolt holes with the bracket. Compress the caliper piston(s) slightly if necessary to clear the new pads using a C-clamp or caliper piston tool (do this slowly to avoid forcing fluid back too quickly). Thread both caliper mounting bolts by hand, then torque to specification.
    Torque spec

    Caliper Mounting Bolts113 Nm (83 lb-ft)
14. 14

    Reinstall wheel and lower vehicle
    Place the wheel onto the hub, aligning the holes with the studs. Thread all lug nuts by hand to prevent cross-threading. Tighten lug nuts in a star pattern (not in a circle) until snug but not fully torqued. Raise the vehicle slightly with the floor jack to unload the jack stands, remove the stands, and lower the vehicle completely to the ground. With the vehicle weight on the wheel, torque the lug nuts to specification in a star pattern.
    Torque spec

    Wheel Lug Nuts89 Nm (66 lb-ft)
15. 15

    Pump brake pedal and check fluid level
    Before moving the vehicle, pump the brake pedal several times until it becomes firm. This repositions the caliper piston against the new pads. The pedal should become firm within 3-5 pumps. If the pedal remains soft or goes to the floor, DO NOT drive the vehicle and inspect for air in the system or caliper issues. Check the brake fluid reservoir and top off with the manufacturer-specified brake fluid (verify correct DOT 4 specification for this vehicle) if needed. Do not overfill. Note: Check the brake fluid reservoir and top off with the Aston Martin-specified brake fluid (verify DOT rating and specification in the owner's manual) if needed. Note: Check the brake fluid reservoir and top off with the DOT 4 brake fluid specified in the owner's manual if needed.

Reassembly

1. Torque all fasteners strictly to specification using a calibrated torque wrench. Brake system fasteners are safety-critical.
2. Always torque wheel lug nuts and caliper bracket bolts in the specified sequence (star pattern for wheels, alternating pattern for bracket bolts).
3. Threadlocker application on caliper bracket bolts is mandatory per manufacturer specification.
4. The brake pedal MUST be pumped until firm before attempting to move the vehicle.

Verification

• With the vehicle on the ground, verify the brake pedal is firm and does not sink when constant pressure is applied for 30 seconds.
• Start the engine (which activates the brake booster) and verify the pedal remains firm with no change in pedal height.
• Perform a low-speed test drive in a safe area. Apply brakes gently at 5-10 mph to verify normal braking function and no pulling to one side.
• After test drive, re-check all lug nut torque with a torque wrench to ensure proper seating.
• Inspect for any brake fluid leaks around the caliper and brake lines.
• After 50-100 miles of driving, re-check lug nut torque and visually inspect the caliper bracket bolts for any signs of loosening (though they should remain secure with threadlocker).
• Bedding procedure: The new rotor and pads (if also replaced) require a proper bedding procedure for optimal performance. Perform 6-10 moderate stops from 40-50 mph down to 10-15 mph with 30-60 seconds of light driving between stops to allow cooling. Avoid hard stops or continuous braking during the first 200 miles.

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