🔧 Ioniq - Rear Brake Pad Replacement

Replacing the rear brake pads on your Ioniq means removing the rear wheels, swinging the caliper out of the way, swapping pads/hardware, and compressing the caliper piston so everything fits back together. The only “big” variable is whether your Ioniq has an electronic parking brake (EPB) or a mechanical (cable/foot pedal) parking brake, because EPB systems must be put into service mode before pushing the piston in.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• 🧯 Support the car on jack stands; never rely on a jack alone.
• 🧤 Brake dust is dirty—wear gloves and safety glasses; avoid breathing dust.
• 🔥 Brakes can be hot—let them cool before starting.
• ⚠️ If equipped with EPB, do not push the rear piston in until EPB is in service mode (or you can damage the EPB motor/gears).
• 🔌 Keep the key fob away and don’t press the brake pedal while a caliper is removed.

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🔧 Required Tools

You'll need the following tools for this repair:

• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• 21mm socket
• Ratchet
• Breaker bar
• 14mm socket
• 17mm socket
• Torque wrench (10–200 Nm range)
• Flat trim tool
• Brake caliper hanger hook
• C-clamp
• Brake piston compressor tool (specialty)
• Wire brush
• Brake cleaner spray
• Shop rags
• Nitrile gloves
• Safety glasses
• Scan tool with EPB service function (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear brake pad set - Qty: 1
• Rear pad hardware/clip kit - Qty: 1
• Brake caliper grease (silicone) - Qty: 1
• Brake cleaner - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, shift to P, and chock the front wheels.
• 🛑 Release the parking brake before lifting the rear (EPB: release with switch; mechanical: release the pedal/lever).
• 🔑 Keep the key fob at least 10 feet away so the car can’t “wake up” unexpectedly.
• 🧰 If your Ioniq has EPB, connect your scan tool and get ready to command EPB Service Mode before compressing pistons.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm parking brake type (EPB vs mechanical)

• Look at the center console: an EPB has a small switch/button (often “P” in a circle).
• A mechanical system usually has a foot parking brake pedal or a hand lever.
• If unsure, tell me what you see.

Step 2: Loosen lug nuts and lift the rear

• Use a 21mm socket with a breaker bar to loosen the rear lug nuts 1/2 turn (do not remove yet).
• Use a floor jack to lift at the rear jacking point, then support with jack stands.
• Remove the lug nuts with the 21mm socket and take the wheels off.

Step 3: Put EPB into service mode (only if equipped)

• Connect a scan tool with EPB service function (specialty).
• Command the rear EPB into its pad service/retract mode (wording varies by scan tool).
• Verify you can freely turn the rear hub/rotor by hand before continuing.

Step 4: Remove the caliper (do not disconnect the brake hose)

• Turn the steering wheel doesn’t matter for rear; just position yourself comfortably.
• Use a 14mm socket and ratchet to remove the two caliper slide-pin bolts.
• Lift the caliper off the bracket and support it with a brake caliper hanger hook (never let it dangle by the hose).

Step 5: Remove old pads and hardware

• Pull the inner/outer pads out by hand. If they’re stuck, use a flat trim tool gently.
• Remove the stainless pad clips/hardware from the bracket.
• Clean the bracket pad “rails” with a wire brush and brake cleaner spray, then wipe with shop rags.

Step 6: Check slide pins (they must move smoothly)

• Slide each pin in/out by hand. If sticky, pull the pin out and wipe it clean with a shop rag.
• Apply a thin coat of brake caliper grease (silicone) to the smooth part of the pin (not on threads).

Step 7: Compress the rear caliper piston

• Place an old pad against the piston face.
• Use a C-clamp or brake piston compressor tool (specialty) to slowly push the piston fully back into the caliper.
• Go slow and keep it straight; if it cocks sideways, back off and re-center.
• Watch brake fluid level as you compress.

Step 8: Install new hardware and pads

• Install the new stainless hardware clips onto the bracket by hand.
• Add a very thin smear of brake caliper grease (silicone) where the pad ears touch the clips (do not get grease on pad friction material).
• Install the new inner and outer pads into the bracket.

Step 9: Reinstall caliper and torque fasteners

• Position the caliper over the new pads.
• Install the caliper slide-pin bolts by hand first to avoid cross-threading, then tighten with a 14mm socket.
• Torque to 28 Nm (21 ft-lbs) using a torque wrench.
• If you removed the caliper bracket: tighten bracket bolts with a 17mm socket and torque wrench, Torque to 75 Nm (55 ft-lbs).

Step 10: Repeat on the other rear side

• Do the same steps on the other rear wheel so braking stays even.

Step 11: Reinstall wheels and torque lug nuts

• Reinstall wheels and hand-thread all lug nuts.
• Lower the car to the ground using the floor jack.
• Tighten lug nuts in a star pattern with a torque wrench: Torque to 90–110 Nm (66–81 ft-lbs).

Step 12: Exit EPB service mode (only if equipped)

• Use the scan tool with EPB service function (specialty) to command EPB back to normal mode.
• Apply and release the parking brake switch a couple times to confirm normal operation.

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✅ After Repair

• 🦶 With the car still in Park, press the brake pedal slowly 10–15 times until it feels firm (this seats the pads).
• 🧪 Do a slow test drive and confirm no grinding, pulling, or warning lights.
• 🔍 Check brake fluid level and top off only if needed (use the cap label fluid type).
• 🛑 New pads need gentle stops for the first 150–200 miles; avoid hard braking unless necessary.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $60-$180 (parts only)

You Save: $190-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.