Brake Rotor - Front Single

Replace a single front brake rotor on a 2007 Ram 3500 with 5.9L Cummins diesel engine, including caliper and bracket removal.

Warnings

Tools required

Parts

• Front brake rotor × 1 — Use OEM specification for DRW or SRW as applicable

Preparation

1. Park vehicle on level, solid ground and place transmission in Park
2. Chock the rear wheels securely on both sides
3. Loosen front wheel lug nuts 1/2 turn while vehicle is on ground (do not remove)
4. Lift front of vehicle with floor jack at frame rail or manufacturer lift point
5. Place jack stands under frame rails behind front axle housing, lower vehicle onto stands
6. Remove wheel lug nuts completely and remove wheel

Procedure

1. 1

   Inspect brake system
   Visually inspect the brake caliper, pads, brake lines, and hardware for damage, leaks, or excessive wear. Note condition of brake pads as they may need replacement if worn beyond 3mm thickness. Check for fluid leaks at caliper and brake hose connections.
2. 2

   Remove caliper slide pins
   Locate the two caliper slide pin bolts on the rear of the caliper assembly (verify head size/type against the specific caliper before selecting a socket). Remove both slide pin bolts completely and set aside. Note that upper and lower bolts may be different lengths on some configurations.
3. 3

   Remove caliper
   Carefully lift the caliper assembly off the rotor and caliper bracket. Support the caliper with a wire hanger or brake caliper hanger from the suspension or frame. Do NOT allow the caliper to hang by the rubber brake hose as this can damage the hose internally.
4. 4

   Remove caliper bracket
   Remove the two caliper bracket mounting bolts that secure the bracket to the steering knuckle (verify socket size against the specific fastener, commonly 21mm on this heavy-duty application). These bolts are typically very tight and may require a breaker bar. Remove the caliper bracket completely and set aside with brake pads still installed.
5. 5

   Remove brake rotor
   Pull the brake rotor straight off the hub studs. If rotor is stuck due to corrosion, use penetrating oil at the hub interface and tap the rotor from behind with a rubber mallet. Some rotors have threaded holes for jacking bolts to press the rotor off the hub face (verify the correct thread size before threading in a bolt). Do not hammer on rotor friction surface.
6. 6

   Clean hub surface
   Use a wire brush to thoroughly clean the hub mounting surface where the rotor sits. Remove all rust, corrosion, and debris to ensure the new rotor seats flat. Clean the wheel studs and threads. Any high spots or debris will cause rotor runout and brake pulsation.
7. 7

   Install new brake rotor
   Apply a thin coating of anti-seize compound to the hub mounting surface (avoid getting on wheel studs). Install the new rotor onto the hub, ensuring it sits flush against the hub face. Thread one lug nut on by hand to hold rotor in place during reassembly. Clean any protective coating from new rotor friction surfaces with brake cleaner.
8. 8

   Reinstall caliper bracket
   Position the caliper bracket onto the steering knuckle. Install both caliper bracket bolts and tighten evenly. These are high-torque fasteners on this heavy-duty truck; look up the factory specification (typically around 220-250 ft-lbs) rather than guessing, as under-torquing is a safety risk. Ensure bracket is seated fully and does not move.
9. 9

   Compress caliper piston
   Before reinstalling the caliper, the piston(s) must be compressed to accommodate potentially thicker new rotor and pads. Use a C-clamp or brake piston compressor tool against the back of the piston and caliper body. Compress slowly and watch brake fluid reservoir - it will rise and may overflow if too full initially.
10. 10

    Reinstall caliper
    Remove the temporary lug nut holding the rotor. Position the caliper over the rotor and bracket, ensuring brake pads fit properly on either side of the rotor. Thread in both caliper slide pin bolts and tighten. Verify the factory specification for these guide pins (commonly in the 30-40 ft-lbs range on this application) rather than guessing. Ensure caliper moves freely on slide pins.
11. 11

    Reinstall wheel
    Mount the wheel onto the hub studs. Install all lug nuts by hand first, then tighten in a star pattern with a wrench. Do not final-torque lug nuts until vehicle is on the ground.

Reassembly

1. Lift vehicle slightly with floor jack, remove jack stands, and lower vehicle completely to ground
2. Final-torque wheel lug nuts to 135 ft-lbs in a star pattern using torque wrench
3. Pump brake pedal slowly 10-15 times until pedal becomes firm before attempting to move vehicle
4. Check brake fluid reservoir level and top off with DOT 3 brake fluid if needed after piston compression
5. If brake pedal feels soft or spongy, bleeding may be required at the replaced side

Verification

• Start engine and verify firm brake pedal with approximately 1-2 inches of travel before resistance
• Test brakes at low speed (5-10 mph) in a safe area to verify proper brake engagement
• Listen for abnormal noises such as grinding, squealing, or rubbing during brake application
• Perform 10-15 moderate stops from 30 mph to properly bed-in new rotor to brake pads
• Re-check lug nut torque after first 50-100 miles of driving
• Inspect for brake fluid leaks around caliper and brake hose connections after test drive
• Have brake system professionally inspected if pedal feel is not firm or if vehicle pulls to one side during braking

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