Brake Rotors - Front Pair

This procedure covers the removal and replacement of both front brake rotors on a 2007 Ram 3500 with 5.9L Cummins diesel and 4WD, including caliper removal and hub service.

Warnings

Tools required

Parts

• Front brake rotor × 2 — Use OEM specification or equivalent for 3500 SRW/DRW as applicable
• Rotor set screws (if applicable) × 4 — M8 x 1.25mm Phillips or Torx

Fluids

• DOT 3 brake fluid — 0.25 qt

Preparation

1. Park vehicle on level, solid ground and place wheel chocks behind rear wheels.
2. Ensure parking brake is disengaged (parking brake operates on rear wheels only).
3. Loosen front wheel lug nuts approximately one turn while vehicle is on ground.
4. Lift front of vehicle using floor jack at approved lift points on front axle or frame.
5. Place jack stands under frame rails at secure points. Lower vehicle onto jack stands.
6. Remove front wheels completely and set aside.
7. Inspect brake fluid level in master cylinder reservoir. If low, investigate for leaks before proceeding.
8. Spray all caliper bolts, caliper bracket bolts, and rotor set screws with penetrating oil and allow to soak.

Procedure

1. 1

   Remove brake caliper
   Locate the two caliper slide pin bolts on the rear of the caliper (typically 18mm). Remove both caliper slide pin bolts completely. Carefully lift the caliper straight up and off the rotor. Do NOT let the caliper hang by the brake hose. Support the caliper by securing it to the suspension or frame using wire, zip ties, or a bungee cord. Ensure there is no tension on the brake hose.
2. 2

   Remove caliper bracket
   Locate the two caliper bracket mounting bolts that secure the bracket to the steering knuckle (verify exact bolt head size against the factory service manual; these may require significant force). Use a breaker bar to remove both bracket bolts. Remove the caliper bracket completely. This exposes the rotor and hub assembly. Inspect brake pads if still attached to bracket and replace if worn.
3. 3

   Remove rotor retaining hardware
   If present, remove the rotor set screw(s) from the face of the rotor using an appropriate Phillips or Torx driver. These screws are typically M8 size and may be very tight or corroded. Apply additional penetrating oil if needed. If screws are severely corroded and strip, they may need to be drilled out. Note: Not all Ram 3500 models have these set screws.
4. 4

   Remove old brake rotor
   Attempt to pull the rotor straight off the hub. If the rotor is stuck due to corrosion, use a rubber mallet to tap around the outer edge and hat section of the rotor to break it free. Do NOT strike the rotor friction surface. If severely stuck, thread bolts into the threaded holes in the rotor face (if equipped) to use as a press-off method. The rotor should slide off the wheel studs once freed.
5. 5

   Clean hub mounting surface
   With the rotor removed, use a wire brush to thoroughly clean the hub face where the rotor mounts. Remove all rust, corrosion, and debris. This ensures the new rotor will seat flat and true. Clean the wheel stud threads as well. Inspect the wheel bearing for excessive play or noise; replace if needed before continuing.
6. 6

   Install new brake rotor
   Apply a thin coat of anti-seize compound to the cleaned hub face (optional but recommended to prevent future corrosion and rotor seizure). Slide the new rotor onto the hub, aligning the holes with the wheel studs. Ensure the rotor is fully seated against the hub face with no gaps. If applicable, install new rotor set screws and tighten snugly (do not over-torque as these are only to hold the rotor during assembly).
7. 7

   Compress caliper pistons
   Before reinstalling the caliper bracket and caliper, the caliper pistons must be compressed to accommodate the new (thicker) rotor. Use a C-clamp or brake caliper compression tool to slowly and evenly compress the piston(s) back into the caliper bore. Place a clean shop rag between the tool and piston to protect the piston surface. This will push brake fluid back into the master cylinder reservoir. Monitor the reservoir to ensure it does not overflow.
8. 8

   Reinstall caliper bracket
   Position the caliper bracket over the rotor and align the mounting bolt holes with the steering knuckle. Install both caliper bracket bolts and hand-thread them first to ensure proper alignment. Torque the caliper bracket bolts to manufacturer specification. Without torque specs in database, consult a factory service manual; these bolts are typically torqued in the range of approximately 125-150 ft-lbs (verify exact value) and are critical to safe brake operation.
9. 9

   Reinstall brake caliper
   Remove the support holding the caliper. Position the caliper over the rotor and bracket, ensuring the brake pads (if installed) align properly with the rotor. Install both caliper slide pin bolts and hand-thread first. Torque the caliper slide pin bolts to manufacturer specification. Without torque specs in database, consult a factory service manual; these are typically torqued in the range of approximately 24-40 ft-lbs depending on specific caliper design (verify exact value).
10. 10

    Repeat for opposite side
    Repeat steps 1 through 9 for the opposite front brake rotor. It is essential to replace rotors in pairs to maintain balanced braking performance. Ensure all hardware is properly torqued on both sides.
11. 11

    Reinstall wheels
    Install wheels onto hubs, ensuring they seat properly. Hand-thread all lug nuts in a star pattern. Snug lug nuts with a wrench but do not fully torque yet. Raise vehicle slightly with jack, remove jack stands, and lower vehicle to ground.
12. 12

    Torque wheel lug nuts
    With vehicle on ground, torque all wheel lug nuts in a star pattern to manufacturer specification. For 2007 Ram 3500, lug nut torque varies by wheel type: SRW is typically around 145 ft-lbs, while DRW (dual rear wheel) 8-lug applications may be significantly higher (up to approximately 200 ft-lbs). Verify exact specification for your wheel type. Verify exact specification for your wheel type. Double-check all lug nuts are properly torqued.

Reassembly

1. Ensure all caliper bolts, bracket bolts, and wheel lug nuts are torqued to proper specifications using a calibrated torque wrench.
2. Verify brake hoses are not twisted, kinked, or under tension.
3. Check brake fluid level in master cylinder reservoir and top off with DOT 3 brake fluid if needed. Do not overfill.
4. Clean any spilled brake fluid or grease from brake components using brake cleaner.

Verification

• Before driving, pump the brake pedal several times until it becomes firm. This repositions the caliper pistons against the new rotors.
• Check brake pedal feel. It should be firm and not travel excessively. If pedal is soft or goes to floor, there is air in the system or a leak. DO NOT DRIVE.
• Perform a low-speed brake test in a safe area (5-10 mph) to verify brakes are functioning properly before normal operation.
• Perform a series of 30-40 mph gentle stops over the first 100-200 miles to properly bed-in the new rotors and transfer pad material. Avoid hard braking during break-in period.
• Listen for any abnormal noises (grinding, squealing, or rubbing) which may indicate improper installation.
• Verify no brake fluid leaks are present at calipers or brake lines after test drive.
• Re-check wheel lug nut torque after first 50-100 miles of driving.

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