🔧 CX-30 - Rear Brake Pad Replacement

Replacing the rear pads on your CX-30 is straightforward, but the rear brakes are tied into the electronic parking brake (EPB). You must retract (pull back) the EPB system before compressing the caliper piston, or you can damage the actuator.

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

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⚠️ Safety & Precautions

• 🛑 Support the vehicle on jack stands; never rely on a jack alone.
• 🛑 EPB caution: Do not force the rear caliper piston in until the EPB is in service/maintenance mode.
• 🛑 Brake dust: Avoid blowing dust; use brake cleaner instead.
• 🛑 Hot brakes: Let the brakes cool fully before starting.
• 🛑 Battery: Keep a stable 12V supply while using EPB service mode; disconnecting the battery is not recommended for this job.

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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 (20–200 Nm range)
• 14mm socket
• 17mm socket
• Flathead screwdriver
• Needle-nose pliers
• Brake caliper piston compressor tool
• Bungee cord
• Wire brush
• Brake cleaner spray
• 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 pad hardware kit (clips/shims) - Qty: 1
• Brake lubricant (silicone/high-temp brake grease) - Qty: 1

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📋 Before You Begin

• Park on level ground, put the shifter in Park, and chock the front wheels.
• Release the parking brake fully before lifting the vehicle.
• Plan to use an EPB “service/maintenance mode” command with a scan tool before you try to compress the rear caliper piston.
• Quick question (so I guide you the right way): Do you have a scan tool that can run EPB Maintenance/Service Mode?

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Put the EPB into service/maintenance mode

• Connect your scan tool with EPB service mode (specialty) to the OBD port.
• Follow the scan tool prompts to run EPB Service Mode / Rear Pad Replacement so the rear calipers retract electronically.
• If you can’t retract EPB, stop here.

Step 2: Loosen the rear wheel lug nuts

• Use a 21mm socket with a 1/2" drive breaker bar to loosen lug nuts 1/2 turn while the tire is on the ground.

Step 3: Lift and support the rear of the vehicle

• Lift using a floor jack (rated 3-ton minimum) at the correct rear jack point.
• Set the vehicle onto jack stands (rated 3-ton minimum) and verify it’s stable.

Step 4: Remove the rear wheels

• Remove lug nuts using a 21mm socket and 3/8" drive ratchet.
• Remove both rear wheels and set them aside.

Step 5: Remove the rear caliper bolts

• Locate the rear caliper slider bolts (upper and lower).
• Use a 14mm socket and 3/8" drive ratchet to remove the slider bolts.
• Lift the caliper off the bracket and hang it with a bungee cord (do not let it hang by the hose).

Step 6: Remove the old pads and hardware

• Pull the pads out of the bracket by hand; use a flathead screwdriver gently if stuck.
• Remove pad clips/shims using a flathead screwdriver or needle-nose pliers.

Step 7: Compress the rear caliper piston

• Confirm the EPB is retracted (service mode completed) before compressing.
• Use a brake caliper piston compressor tool to press the piston straight back into the caliper slowly.
• Go slow to avoid reservoir overflow.

Step 8: Clean and prep the bracket

• Spray the bracket pad-contact areas with brake cleaner spray.
• Use a wire brush to remove rust where the pad clips sit.
• Install the new hardware clips from the kit.

Step 9: Install the new rear pads

• Apply a thin film of brake lubricant (silicone/high-temp brake grease) to pad ears where they slide in the clips (avoid friction material).
• Install the inner and outer pads into the bracket.

Step 10: Reinstall the caliper

• Set the caliper over the new pads.
• Reinstall the slider bolts using a 14mm socket.
• Torque to 25 Nm (18 ft-lbs) for the rear caliper slider bolts.

Step 11: If you removed the caliper bracket (only if needed)

• If pads won’t fit due to a rotor lip or heavy rust, you may need bracket removal.
• Remove bracket bolts using a 17mm socket and 1/2" drive breaker bar.
• Reinstall bracket bolts and Torque to 90 Nm (66 ft-lbs).

Step 12: Reinstall wheels

• Install wheels and hand-thread lug nuts.
• Lower the vehicle off the stands using the floor jack (rated 3-ton minimum).
• Torque lug nuts in a star pattern using a torque wrench (20–200 Nm range): Torque to 108 Nm (80 ft-lbs).

Step 13: Exit EPB service/maintenance mode

• Use the scan tool with EPB service mode (specialty) to command EPB Close/Initialize (wording varies by tool).
• Confirm no EPB warning lights remain.

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✅ After Repair

• With the engine off, pump the brake pedal 10–15 times until it feels firm.
• Start the engine and press the brake pedal again; confirm normal feel.
• Test the parking brake apply/release function at a stop.
• Do a slow test drive and confirm no grinding, pulling, or warning lights.
• Easy on brakes for first 200 miles.

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💰 DIY vs Shop Cost

Shop Cost: $300-$550 (parts + labor)

DIY Cost: $60-$160 (parts only)

You Save: $140-$490 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 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.