Brake Rotor - Front Single

This procedure covers the replacement of a single front brake rotor on a 2023 Chevrolet Bolt EUV, including caliper removal, rotor replacement, and proper reassembly with critical torque specifications.

Warnings

Tools required

Parts

• Front brake rotor (single) × 1 — ACDelco 177-1197 or equivalent OEM
• Rotor set screws (if corroded) × 2 — M6 x 1.0 socket head set screws

Preparation

1. Park vehicle on level, solid surface and apply parking brake firmly
2. Shift transmission to Park position
3. Chock the rear wheels securely on both sides
4. Loosen the front wheel lug nuts 1/4 turn while vehicle is on the ground (do not remove)
5. Raise the front of the vehicle using the proper jacking points per owner's manual
6. Support vehicle with jack stands rated for the vehicle weight at designated support points
7. Remove the wheel completely and set aside in a safe location
8. Verify the vehicle is stable before working underneath

Procedure

1. 1

   Inspect brake system and identify components
   Visually inspect the brake caliper, rotor, brake hose, and surrounding components for damage, leaks, or excessive corrosion. Identify the caliper bracket bolts (two large bolts securing the bracket to the steering knuckle) and the caliper slide pin bolts (two smaller bolts holding the caliper to the bracket). Note the condition of the brake pads for reference during reassembly.
2. 2

   Retract caliper piston
   Before loosening any bolts, use a C-clamp or brake caliper piston tool to slowly compress the caliper piston back into its bore. Place the clamp against the back of the caliper body and the outboard brake pad. Compress slowly and evenly. This step prevents brake fluid overflow at the master cylinder reservoir and makes caliper removal easier. Monitor the brake fluid reservoir under the hood; if fluid level rises to the MAX line, remove some fluid with a turkey baster or fluid syringe to prevent overflow.
3. 3

   Remove caliper slide pin bolts
   Locate the two caliper slide pin bolts on the rear of the caliper assembly. These are typically hex head bolts accessible from the back side of the caliper. Use the appropriate hex socket to remove both slide pin bolts completely. Keep track of these bolts as they will be reused. If bolts are seized, apply penetrating oil and allow to soak for 10-15 minutes before attempting removal.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
4. 4

   Remove and support brake caliper
   Carefully lift the caliper assembly off the rotor and bracket. Do NOT allow the caliper to hang by the brake hose as this can damage the hose internally. Use a caliper hanger, strong wire, or bungee cord to secure the caliper to the suspension strut or another solid component. Ensure there is no tension or strain on the rubber brake hose. Leave the brake hose connected to the caliper.
5. 5

   Remove brake pads and hardware
   Remove the brake pads from the caliper bracket. Note their orientation and the position of any anti-rattle clips, shims, or pad hardware. Keep all hardware organized for reinstallation. Inspect brake pads for even wear; uneven wear may indicate caliper or slide pin issues that should be addressed.
6. 6

   Remove caliper bracket
   Identify the two large caliper bracket bolts that secure the bracket to the steering knuckle. These are substantial bolts requiring significant torque. Use a breaker bar if necessary to loosen them. Remove both bracket bolts completely and remove the caliper bracket assembly. Set aside in a clean area. These bolts may have thread locker residue; clean threads with a wire brush before reinstallation.
   Torque spec

   Bracket Bolts102 Nm (75 lb-ft)
7. 7

   Remove rotor set screws and old rotor
   Locate the rotor set screws (typically 1-2 Phillips or Torx screws) that retain the rotor to the hub during assembly. These screws often corrode and may require penetrating oil or an impact driver to remove. If screws strip or break, they can be drilled out as they are not structurally critical (wheel studs hold the rotor in place during operation). Once set screws are removed, pull the rotor off the hub. If rotor is stuck due to corrosion, tap around the rotor hat area with a rubber mallet. Do NOT strike the rotor friction surface.
   Torque spec

   Rotor Set Screws7 Nm (5 lb-ft)
8. 8

   Clean hub surface and inspect
   Use a wire brush to thoroughly clean the hub mounting surface, removing all rust, corrosion, and debris. The hub face must be clean and smooth to ensure the rotor seats flat without runout. Inspect the wheel studs for damage or excessive corrosion; replace if threads are compromised. Clean the hub bore and check the wheel bearing for play by attempting to rock the hub; any movement indicates bearing wear that should be addressed. Spray the cleaned surface with brake cleaner and wipe dry.
9. 9

   Install new rotor
   Remove any protective coating from the new rotor using brake cleaner (rotors are shipped with a rust-preventive oil coating that must be removed). Clean both friction surfaces thoroughly. Position the new rotor onto the hub, aligning the holes for the set screws. The rotor should sit completely flush against the hub surface with no gaps. Install new or cleaned rotor set screws and tighten to specification. If set screws were severely corroded, use new screws with a drop of thread locker.
   Torque spec

   Rotor Set Screws7 Nm (5 lb-ft)
10. 10

    Reinstall caliper bracket
    Position the caliper bracket back onto the steering knuckle, aligning the bolt holes. Clean the threads of the caliper bracket bolts with a wire brush and apply medium-strength thread locker as recommended. Start both bracket bolts by hand to ensure proper thread engagement. Tighten the caliper bracket bolts to the specified torque in a crisscross pattern (alternate between bolts). Use a calibrated torque wrench and verify final torque on both bolts.
    Torque spec

    Bracket Bolts102 Nm (75 lb-ft)
11. 11

    Reinstall brake pads and hardware
    Install any anti-rattle clips, shims, or pad hardware back onto the caliper bracket in their original positions. Apply a thin layer of silicone brake grease to the pad backing plates where they contact the bracket (NOT on the friction material). Install the brake pads into the caliper bracket, ensuring they are properly seated and can move freely in the bracket.
12. 12

    Reinstall brake caliper
    Remove the caliper from its support hanger. Verify the caliper piston is fully retracted. Carefully position the caliper over the brake pads and rotor, aligning the slide pin bolt holes. Clean the slide pin bolts and apply fresh silicone brake grease to the pin shafts as specified. Thread both slide pin bolts by hand first to ensure proper alignment. Tighten the caliper slide pin bolts to the specified torque using a calibrated torque wrench.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
13. 13

    Reinstall wheel and lower vehicle
    Position the wheel onto the hub, aligning the wheel with the studs. Install all lug nuts by hand, threading them on several turns to ensure proper engagement. Tighten lug nuts in a star pattern using a torque wrench to the specified torque. Lower the vehicle carefully from the jack stands using the floor jack. Once the vehicle weight is on the wheels, perform a final torque verification on all lug nuts in a star pattern.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Double-check that all fasteners have been installed and torqued to specification
2. Verify brake caliper is properly secured and brake hose has no kinks or tension
3. Remove any tools or parts from the work area and from under the vehicle

Verification

• Before moving the vehicle, pump the brake pedal slowly several times until it becomes firm. The pedal should return to normal height and feel. The first few pedal strokes will feel soft as the caliper piston repositions against the new rotor.
• Check the brake fluid level in the master cylinder reservoir and top off with ACDelco DOT 4 brake fluid if needed (do not overfill)
• Start the vehicle and verify the brake warning light is not illuminated on the dashboard
• Perform a low-speed test drive in a safe area, testing brake response at 5-10 mph. The vehicle should brake smoothly without pulling to one side
• Listen for any unusual noises such as grinding, squealing, or rubbing during the test drive
• Perform several moderate brake applications from 25-30 mph to begin bedding the new rotor and pads (full bedding requires 200-300 miles of normal driving)
• After the first 50-100 miles, re-torque the wheel lug nuts to specification
• If pedal feel is soft, excessive pedal travel is present, or the vehicle pulls during braking, do NOT drive the vehicle and seek professional diagnosis immediately

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle