Brake Caliper Rebuild - Front

This procedure covers the complete disassembly, cleaning, inspection, and rebuilding of the front brake calipers on a 2018-2024 Honda Accord 1.5L Turbo, including seal and boot replacement.

Warnings

Tools required

Parts

• Front brake caliper rebuild kit (seals, boots, and hardware) × 2 — Use Honda OEM or equivalent quality rebuild kit
• Silicone brake grease (high-temp caliper grease) × 1 — Use synthetic silicone brake lubricant
• Threadlocker (medium strength) × 1 — Loctite 243 or equivalent
• Brake cleaner solvent × 1 — Non-chlorinated brake parts cleaner

Fluids

• DOT 3 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level surface and chock rear wheels securely
2. Remove approximately half the brake fluid from master cylinder reservoir using turkey baster or fluid extractor to prevent overflow during caliper work
3. Loosen front wheel lug nuts while vehicle is on ground
4. Raise front of vehicle with floor jack and support on jack stands at manufacturer-specified jacking points on chassis rails
5. Remove front wheels completely
6. Clean caliper exterior with brake cleaner and wire brush to remove road dirt and corrosion before disassembly
7. Take detailed photos of caliper assembly, pad position, and hardware orientation for reference

Procedure

1. 1

   Remove brake caliper from vehicle
   Place drip pan under caliper. Remove the caliper slide pin bolts (typically two bolts on rear of caliper). Carefully lift caliper off rotor and bracket. Support caliper with wire or bungee cord to prevent strain on brake hose. Do NOT let caliper hang by the brake hose.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
2. 2

   Disconnect brake hose and remove caliper
   Place shop towels around brake hose connection to catch fluid. Using appropriate wrench, disconnect the banjo bolt or brake hose fitting from the caliper. Immediately plug or cap the brake line to minimize fluid loss and prevent contamination. Completely remove caliper from vehicle and place on clean workspace covered with shop towels.
   ⚠Brake fluid will drain from hose and caliper. Keep drip pan positioned and have towels ready.
3. 3

   Remove brake pads and hardware
   Remove the caliper bracket bolts to separate the bracket from the caliper body if not already separated. Remove brake pads, shims, and any anti-rattle clips or hardware. Keep these organized for cleaning and inspection. Note the orientation of all components.
   Torque spec

   Bracket Bolts97 Nm (71 lb-ft)
4. 4

   Extract caliper piston using compressed air
   Place several shop towels or a block of wood inside the caliper to catch the piston. Apply LOW pressure compressed air (20-30 PSI maximum) to the brake hose inlet port. The piston will slowly move out and eventually pop free. Keep hands clear of piston path. If piston is stuck, apply penetrating oil around piston edge, wait 15 minutes, and retry with gradual air pressure increases.
   ⚠️NEVER use high-pressure air or position hands in front of piston. Piston can eject with significant force causing serious injury.
   ⚠If piston cannot be removed with reasonable air pressure, caliper may be seized and require replacement rather than rebuild.
5. 5

   Remove dust boot and piston seal
   Remove the dust boot from the caliper bore groove using a pick or small screwdriver, being careful not to scratch the bore. Remove the piston seal from its groove inside the caliper bore using a wooden or plastic pick. NEVER use metal tools inside the bore as scratches will ruin the caliper. Discard all old seals and boots.
   ⚠Do not scratch or gouge the caliper bore surface. Any damage to the bore requires caliper replacement.
6. 6

   Clean and inspect caliper components
   Thoroughly clean caliper bore, piston, and all caliper passages using brake cleaner and lint-free shop towels. Use wire brush on exterior surfaces only. Inspect caliper bore for any scoring, pitting, rust, or corrosion. The bore must be perfectly smooth and chrome-plated surface intact. Inspect piston for scoring, pitting, or chrome flaking. Any defects in bore or piston require caliper replacement. Clean slide pin bores in caliper bracket and inspect for wear.
   ⚠If caliper bore or piston show ANY scoring, pitting, or corrosion, STOP and replace the entire caliper. Damaged bores cannot be repaired and will cause seal failure and brake fluid leaks.
7. 7

   Install new piston seal
   Verify all components are completely clean and dry. Lubricate the new piston seal lightly with clean DOT 3 brake fluid. Carefully install the new seal into the groove inside the caliper bore using only your fingers. Ensure seal is seated evenly in groove all the way around with no twists or folds. Do NOT use tools that could damage the seal.
   ⚠Use only clean brake fluid as lubricant. Never use petroleum-based lubricants which will destroy rubber seals.
8. 8

   Install piston and dust boot
   Lubricate caliper bore and piston exterior lightly with clean brake fluid. Install the new dust boot onto the piston according to rebuild kit instructions (some install on piston first, others install in caliper groove first). Carefully insert piston into bore, ensuring it does not damage the seal. Push piston fully into bore by hand or using caliper piston tool, applying even pressure. Seat dust boot into caliper groove, ensuring it is fully seated all around with no gaps or folds.
   ⚠Do not cock or tilt piston during installation. It must go in straight to avoid damaging the seal.
9. 9

   Service caliper slide pins and bracket
   Remove slide pins from caliper bracket. Clean slide pins and bores thoroughly with brake cleaner. Inspect slide pins for scoring or corrosion; replace if damaged. Apply silicone brake grease liberally to slide pins and reinstall into bracket bores. Pins should slide smoothly with light resistance. Clean bracket hardware contact points and apply thin layer of silicone brake grease to pad abutment surfaces.
   ℹ️Do NOT use standard lithium grease. Only use high-temperature silicone brake grease rated for brake caliper use.
10. 10

    Reinstall caliper bracket to hub
    If bracket was removed from hub, clean bracket mounting surface and hub mounting surface with wire brush. Apply medium-strength threadlocker to caliper bracket bolt threads. Position bracket on hub and install caliper bracket bolts. Torque bolts to specification in a cross pattern.
    ⚠️Caliper bracket bolt torque is CRITICAL for safety. Use calibrated torque wrench and verify torque specification.
    Torque spec

    Bracket Bolts97 Nm (71 lb-ft)
11. 11

    Reinstall brake pads and caliper
    Install brake pads, shims, and hardware onto bracket in correct orientation as photographed during disassembly. Position caliper over pads and bracket. Apply silicone brake grease to slide pin bolt threads and contact surfaces. Install and torque caliper slide pin bolts to specification.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
12. 12

    Reconnect brake hose
    Remove plugs from brake line and caliper port. Install new copper crush washers (if using banjo bolt connection) on both sides of fitting. Connect brake hose to caliper and torque banjo bolt or fitting to proper specification. Ensure hose is not twisted or kinked.
    ⚠Always use NEW copper crush washers on banjo bolt fittings. Reusing old washers will cause brake fluid leaks.
13. 13

    Bleed brake caliper
    Attach clear hose to bleeder screw and submerge other end in container with clean brake fluid. Have assistant pump brake pedal 3-5 times and hold pressure. Open bleeder screw 1/4 turn and allow fluid/air to evacuate, then close bleeder before pedal reaches floor. Repeat until no air bubbles appear in hose and only clean fluid flows. Torque bleeder screw to specification. Maintain master cylinder fluid level throughout bleeding process.
    ⚠️Do not allow master cylinder to run dry during bleeding or additional air will enter system requiring complete system bleeding.
    ⚠Bleeder screw is brass and easily stripped. Do not overtighten.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
14. 14

    Repeat process for second caliper
    Repeat all disassembly, cleaning, inspection, rebuild, and bleeding steps for the opposite front caliper. Always rebuild both front calipers together to ensure matched braking performance.
    ℹ️Never rebuild only one caliper. Always rebuild both calipers on the same axle to maintain balanced braking.
15. 15

    Reinstall wheels and perform final bleeding
    Reinstall wheels and hand-tighten lug nuts in star pattern. Lower vehicle to ground and torque lug nuts to specification in star pattern. Perform final brake system bleeding at all four wheels in proper sequence (typically RR, LR, RF, LF). Top off master cylinder to MAX line with fresh DOT 3 brake fluid.
    ⚠️Wheel lug nut torque is CRITICAL. Use calibrated torque wrench and star pattern sequence.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Ensure all bleeder screws are torqued properly and caps are installed
2. Verify brake fluid level is at MAX line in master cylinder reservoir
3. Clean any brake fluid spills from painted surfaces, calipers, and wheels immediately
4. Inspect all brake connections for fluid leaks before test driving

Verification

• With engine off, pump brake pedal 10-15 times. Pedal should become firm and hold steady pressure without sinking
• Start engine and verify brake pedal height is normal and does not sink when held under pressure for 30 seconds
• Check for any brake fluid leaks at caliper connections, bleeder screws, and brake hoses while assistant applies pedal pressure
• Perform low-speed test drive in safe area, testing brake response at 5-10 MPH before proceeding to normal driving
• During first test drive, apply brakes gently multiple times to seat pads, then verify firm pedal feel and straight-line stopping
• Perform final torque verification on all caliper bolts and wheel lug nuts after test drive
• Re-check brake fluid level after test drive and top off if needed
• CRITICAL: If pedal feels spongy, sinks under pressure, or stopping distance seems increased, DO NOT DRIVE and re-bleed entire system or seek professional help

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