Brake Pads and Rotors - Front

This procedure covers the replacement of front brake pads and rotors on a 2023 Chevrolet Bolt EUV electric vehicle, including proper torque specifications and break-in procedures.

Warnings

Tools required

Parts

• Front brake pad set (4 pads) × 1 — Use OEM or equivalent ceramic pads
• Front brake rotors × 2 — Use OEM specification
• Brake hardware/clip kit × 1 — Often included with pad set

Fluids

• ACDelco DOT 4 Brake Fluid — 0.25 qt

Preparation

1. Park vehicle on level ground and engage parking brake. Place wheel chocks behind rear wheels.
2. Turn vehicle off and ensure it is in Park mode.
3. Remove approximately 1/3 of brake fluid from master cylinder reservoir using turkey baster to prevent overflow when compressing caliper pistons. Dispose of old fluid properly.
4. Loosen front wheel lug nuts while vehicle is on ground, but do not remove.
5. Lift front of vehicle using floor jack at designated lift points and secure with jack stands rated for vehicle weight.
6. Remove front wheels completely and set aside.

Procedure

1. 1

   Inspect brake system and prepare caliper removal
   Inspect brake lines, caliper, and surrounding components for damage, leaks, or excessive corrosion. Check rotor thickness and condition. Spray caliper bolts and bracket area with penetrating lubricant if corrosion is present. Identify caliper slide pin bolts (upper and lower) that secure caliper to bracket.
2. 2

   Remove caliper from bracket
   Remove the two caliper slide pin bolts securing the caliper to the bracket. These are typically on the back side of the caliper assembly. Support the caliper with a wire or bungee cord hung from the suspension - never let it hang by the brake hose as this can damage the hose internally. Do not disconnect the brake line.
   ⚠Never allow the caliper to hang by the brake hose. Support it with wire or a hanger to prevent hose damage.
3. 3

   Remove brake pads and hardware
   Remove the old brake pads from the caliper bracket. Note the orientation and position of any anti-rattle clips, shims, or springs. Remove and discard old pad hardware clips from the bracket. Take photos if needed to remember assembly order.
4. 4

   Remove caliper bracket and rotor
   Remove the two caliper bracket bolts (larger bolts securing bracket to steering knuckle). Remove the bracket completely. If rotor does not slide off easily, thread two M8 bolts into the threaded holes on the rotor face and tighten evenly to push rotor off hub, or use a rotor puller. Clean hub face thoroughly with wire brush, removing all rust and debris.
   ⚠Caliper bracket bolts are high-torque fasteners. Use proper size tools to prevent rounding bolt heads.
5. 5

   Prepare new rotors and hub surface
   Clean hub mounting surface with wire brush until bare metal is visible. Apply thin coat of anti-seize to hub face (avoid rotor contact area). Remove protective coating from new rotors using brake cleaner and lint-free cloth - new rotors have an oil coating that must be completely removed from both sides. Clean thoroughly until cloth shows no residue.
   ⚠Failure to remove protective coating from new rotors will cause brake noise, vibration, and reduced braking performance.
6. 6

   Install new rotors and caliper bracket
   Install new rotor onto hub. If rotor has directional marking, ensure correct orientation. Use a lug nut to temporarily hold rotor in place. Clean caliper bracket bolt threads with wire brush. Apply medium-strength thread locker to caliper bracket bolt threads. Install caliper bracket and torque bracket bolts to specification in a cross pattern.
   Torque spec

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

   Compress caliper piston
   Before installing new pads, compress the caliper piston fully into its bore using a C-clamp or brake caliper piston tool. Place an old brake pad against the piston to protect it. Compress slowly and watch master cylinder reservoir - stop if fluid begins to overflow. This step is necessary because new, thicker pads require more clearance.
   ⚠Monitor brake fluid reservoir while compressing piston. Fluid level will rise and may overflow if too full.
8. 8

   Install new brake hardware and pads
   Install new anti-rattle clips and hardware into caliper bracket according to pad kit instructions. Apply a thin layer of silicone brake grease to pad backing plates where they contact the caliper and bracket (do not get grease on friction material). Install new brake pads into bracket, ensuring they are properly seated in hardware clips.
9. 9

   Prepare and reinstall caliper
   Clean caliper slide pins thoroughly and inspect rubber boots for tears. Apply silicone brake grease liberally to slide pins and boots. Ensure pins move freely in bracket. Position caliper over new pads and align with slide pin bolt holes. Apply silicone brake grease to slide pin bolt threads and under bolt heads.
10. 10

    Torque caliper slide pin bolts
    Install both caliper slide pin bolts and torque to specification. Verify caliper is properly seated and moves freely on slide pins. Check that brake pads are centered on rotor and not binding.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
11. 11

    Repeat for opposite side
    Repeat all steps (1-10) for the opposite front brake assembly. Ensure both sides are completed identically with proper torque specifications and lubrication.
12. 12

    Reinstall wheels and restore brake fluid
    Reinstall wheels and hand-tighten lug nuts in a star pattern. Lower vehicle to ground and torque lug nuts to specification in star pattern. Check brake fluid level in master cylinder and top off with fresh DOT 4 brake fluid to MAX line if needed. Do not reuse old fluid.
    ⚠Only use fresh DOT 4 brake fluid. Never mix different brake fluid types or reuse old fluid.
    Torque spec

    Wheel Lug Nuts136 Nm (100 lb-ft)
13. 13

    Restore brake pedal and initial testing
    Before moving vehicle, pump brake pedal slowly 10-15 times until pedal feels firm and reaches normal height. This repositions caliper pistons against new pads. Pedal should feel firm - if it goes to floor, recheck all work immediately. Check brake fluid level again and top off if necessary.
    ⚠️Do not attempt to drive vehicle until brake pedal feels firm and returns to normal height. A soft or spongy pedal indicates air in system or incorrect assembly.

Reassembly

1. Ensure all caliper bracket and slide pin bolts are torqued to specification with appropriate thread locker and lubrication applied.
2. Verify brake fluid reservoir is filled to MAX line with fresh DOT 4 fluid.
3. Double-check that all tools and parts are removed from wheel wells and no hardware is left loose.
4. Ensure wheels are torqued to specification in proper star pattern.

Verification

• With vehicle still raised, rotate each front wheel by hand - it should rotate freely with only slight drag from new pads. Excessive resistance indicates binding caliper or incorrect assembly.
• Brake pedal must be firm and at normal height before driving. If pedal is soft or goes to floor, do not drive - recheck all work.
• Perform initial test stops at low speed (5-10 mph) in a safe area to verify brakes engage properly and vehicle stops straight without pulling.
• Perform proper brake bedding procedure: Make 10-15 moderate stops from 30-40 mph with 30 seconds of driving between stops to cool brakes. Avoid hard stops or continuous braking for first 200 miles.
• After first test drive, recheck lug nut torque and brake fluid level. Recheck again after 50 miles of driving.
• Listen for any unusual noises (grinding, squealing beyond normal new pad break-in) and feel for vibration or pulling during braking.
• If ABS light, brake warning light, or any unusual symptoms appear, stop driving immediately and have system inspected by qualified technician.

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