🔧 Sonata - Rear Brake Pads & Rotor Replacement

On your Sonata, replacing the rear brake pads and rotors is a straightforward bolt-on job, but the parking brake system matters a lot. If your Sonata has an electronic parking brake (EPB), the rear calipers must be put into “service/maintenance mode” before you compress the pistons.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• ⚠️ Support the car with jack stands; never rely on a jack.
• ⚠️ If equipped with EPB, do not force the rear pistons inward until EPB is in service mode.
• ⚠️ Do not press the brake pedal with a caliper removed.
• ⚠️ Brakes create dust—use a mask and brake cleaner, not compressed air.
• ⚠️ Keep brake fluid off paint; wipe spills immediately.
• ⚠️ Battery disconnect is not typically required for this rear brake job; keep the car OFF and the key/fob away so systems don’t wake up.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• 21mm socket
• 3/8" drive ratchet
• 1/2" drive breaker bar
• Torque wrench (10-200 Nm range)
• 14mm socket
• 17mm socket
• Flat trim tool
• Needle-nose pliers
• Bungee cord
• C-clamp brake piston compressor
• Impact screwdriver
• Phillips #3 bit
• Wire brush
• Brake cleaner
• Nitrile gloves
• Safety glasses
• Scan tool with EPB service mode (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear brake pad set - Qty: 1
• Rear brake rotors - Replace in pairs - Qty: 2
• Rear pad hardware/clip kit - Qty: 1
• Brake caliper slide pin grease (silicone) - Qty: 1
• Brake parts cleaner - Qty: 1
• Brake fluid (DOT 3 or DOT 4) - Qty: 1 quart

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📋 Before You Begin

• Park on level ground, turn the car OFF, and chock the front wheels.
• Release the parking brake before lifting the rear of the car.
• Open the hood and check the brake fluid reservoir level; you may need to remove a little fluid if it’s already near “MAX” (fluid rises when pistons are pushed back).
• If your Sonata has an EPB switch (button), plan to use EPB service/maintenance mode before compressing rear pistons. A scan tool is the cleanest method.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the rear

• Use wheel chocks at the front tires.
• Loosen rear lug nuts with a 21mm socket and breaker bar (just “crack” them loose).
• Lift the rear with a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove the wheels using a 21mm socket.

Step 2: Put the parking brake system in the correct state

• If your Sonata has a traditional hand/foot parking brake: make sure it’s fully released.
• If your Sonata has an EPB switch: use a scan tool with EPB service mode (specialty) to command EPB Maintenance Mode / Pad Replacement Mode.
• EPB service mode retracts the parking brake actuator.

Step 3: Remove the caliper

• Turn the steering wheel straight and work on one side at a time.
• Remove the two caliper slide bolts using a 14mm socket and 3/8" drive ratchet.
• Lift the caliper off the bracket and hang it with a bungee cord (do not let it hang by the hose).

Step 4: Remove pads and inspect hardware

• Remove the inner/outer pads from the bracket by hand or with a flat trim tool.
• Remove the pad clips (hardware) using a flat trim tool.
• Clean the bracket pad “lands” (where clips sit) using brake cleaner and a wire brush.

Step 5: Remove the caliper bracket

• Remove the caliper bracket bolts using a 17mm socket and breaker bar.
• Set the bracket aside.
• When reinstalling: Torque to 85 Nm (63 ft-lbs).

Step 6: Remove the rotor

• Remove the rotor retaining screw (if present) using an impact screwdriver with a Phillips #3 bit.
• Pull the rotor off the hub. If stuck, reinstall one lug nut a few turns and strike the rotor “hat” area (not the braking surface) carefully, then remove.

Step 7: Prep hub and install new rotor

• Clean hub face rust using a wire brush and brake cleaner.
• Install the new rotor. If there’s a retaining screw, reinstall it using an impact screwdriver and Phillips #3 bit to Torque to 6 Nm (53 in-lbs).

Step 8: Service slide pins and reinstall the bracket

• Pull slide pins out of the bracket by hand; clean and re-grease them with brake caliper slide pin grease (silicone).
• Reinstall the bracket and tighten bolts with a 17mm socket and torque wrench to Torque to 85 Nm (63 ft-lbs).

Step 9: Install new pad hardware and pads

• Install new pad clips from the rear pad hardware/clip kit by hand (use a flat trim tool if needed).
• Apply a thin film of brake caliper slide pin grease (silicone) where pads contact the clips (avoid the pad friction material).
• Install the new pads into the bracket.

Step 10: Compress the rear caliper piston

• Position the old pad against the piston and use a C-clamp brake piston compressor to slowly push the piston in.
• If the piston will not compress smoothly, stop—EPB may not be in service mode or the piston may be the “screw-in” style on some variants.
• Go slow to avoid reservoir overflow.

Step 11: Reinstall the caliper

• Place the caliper over the new pads.
• Install and tighten the slide bolts using a 14mm socket and torque wrench to Torque to 25 Nm (18 ft-lbs).

Step 12: Reinstall wheels

• Reinstall wheels and hand-thread lug nuts.
• Lower the car and torque lug nuts in a star pattern using a torque wrench and 21mm socket to Torque to 90 Nm (66 ft-lbs).

Step 13: Take EPB out of service mode (if equipped)

• Use the scan tool with EPB service mode (specialty) to command EPB Normal Mode / Close/Apply as instructed.

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✅ After Repair

• Pump the brake pedal 10-15 times until it feels firm (this seats the pistons).
• Check brake fluid level and top off with brake fluid (DOT 3 or DOT 4) if needed.
• Test at low speed first; confirm no grinding, pulling, or warning lights.
• Pad bed-in (break-in): do 6-8 moderate stops from 40 to 10 mph, with cool-down driving between stops.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $160-$350 (parts only)

You Save: $290-$500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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