🔧 CX-5 - Rear Brake Pad and Rotor Replacement

The critical move is putting the electronic parking brake into maintenance mode before touching either rear caliper. After that, this is a straightforward pad-and-rotor job, but careful cleaning and correct torque matter because brakes aren’t the place for “good enough.”

Assumption: This procedure covers the factory rear disc brakes and electronic parking brake on your CX-5.

Difficulty Level: Intermediate | Estimated Time: 3-4 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level, solid ground and chock both front wheels.
• ⚠️ Support your CX-5 with jack stands. Never work under a vehicle supported only by a jack.
• ⚠️ Release the parking brake before entering maintenance mode.
• ⚠️ Never compress or rotate the rear pistons before maintenance mode is active. That can damage the electric parking-brake mechanism.
• ⚠️ Keep grease, brake cleaner residue, and dirty hands off pad and rotor friction surfaces.
• ⚠️ Do not press the brake pedal while a caliper is removed.
• ⚠️ Do not disconnect the brake hoses. This procedure should not require bleeding.
• ⚠️ Leave the battery connected because the electronic parking brake needs electrical power.

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🔧 Required Tools

You'll need the following tools for this repair:

• 21mm deep socket
• 14mm socket
• 17mm socket
• 19mm open-end wrench
• 3/8-inch drive ratchet
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench rated 20-150 ft-lbs
• Rear disc-brake piston compression tool
• Flat-blade screwdriver
• Small wire brush
• Dead-blow hammer
• Brake caliper hanger hook
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Wheel chocks
• Drain pan
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear ceramic brake pad set - Qty: 1
• Rear brake rotors - Qty: 2, replace in pairs
• Rear brake pad hardware kit - Qty: 1
• Aerosol brake parts cleaner - Qty: 2 cans
• High-temperature silicone brake grease - Qty: 1 tube
• Clean shop towels - Qty: 1 pack

The matching rear pads, rotors, hardware, and calipers are now displayed in the parts sidebar.

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📋 Before You Begin

• 📋 Park on level ground, select Park, switch off AUTOHOLD, and chock both front wheels.
• 📋 Check the brake-fluid reservoir. If it is above the maximum line, remove a small amount before compressing the pistons.
• 📋 Do not set the parking brake after lifting the vehicle.
• 📋 Photograph the pad clips and wear-indicator positions before removing them.
• 📋 Maintenance mode retracts the electronic parking-brake actuators so the pistons can be pushed straight inward.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Enter Electronic Parking Brake Maintenance Mode

• Keep your foot off the brake pedal and switch the ignition on without starting the engine.
• Use the parking-brake switch to release the electronic parking brake completely.
• Switch the ignition off.
• Press and hold the accelerator pedal fully down while pushing and holding the parking-brake switch downward.
• While holding both controls, switch the ignition on within five seconds without starting the engine.
• Listen for the rear parking-brake motors and verify that the amber parking-brake warning indicator illuminates.
• Release the controls and switch the ignition off. Mazda specifies maintenance mode for rear brake-pad service on EPB-equipped CX-5 models. paulstravelpictures.com)

Step 2: Loosen the Rear Wheel Nuts

• Use the 21mm deep socket and 1/2-inch drive breaker bar to loosen each rear wheel nut about one-half turn.
• Do not remove the wheel nuts while your CX-5 is still on the ground.

Step 3: Raise and Support the Rear

• Position the floor jack rated 2-ton minimum under the designated rear lifting point.
• Raise the rear and position the jack stands rated 2-ton minimum beneath the designated side support points.
• Lower your CX-5 gently onto both stands and confirm that it is stable.
• Use the 21mm deep socket and 3/8-inch drive ratchet to remove both rear wheels.

Step 4: Remove the Rear Caliper

• Place the drain pan beneath the brake assembly to catch dirt and cleaner.
• Use the 14mm socket and 3/8-inch drive ratchet to remove the upper and lower caliper guide-pin bolts.
• If a guide pin spins, hold its flats with the 19mm open-end wrench.
• Lift the caliper from the bracket and support it with the brake caliper hanger hook.
• Do not let the caliper hang from its rubber brake hose or electrical parking-brake wiring.

Step 5: Remove the Old Pads and Bracket

• Pull the inner and outer pads from the bracket by hand.
• Use the flat-blade screwdriver carefully if corrosion has trapped the pads.
• Use the 17mm socket and 1/2-inch drive breaker bar to remove both caliper-bracket bolts.
• Remove the bracket and old stainless pad clips.
• Compare every old pad with its replacement.

Step 6: Remove the Old Rotor

• Pull the rotor straight from the hub.
• If it is stuck, use the dead-blow hammer to strike the rotor hat between the wheel studs.
• Rotate the rotor while tapping it. Do not hit the wheel studs or backing plate.
• Use the small wire brush to remove rust from the hub face.
• Wipe the hub clean with brake parts cleaner and a clean shop towel.

Step 7: Prepare and Install the New Rotor

• Clean both friction surfaces of the new rotor thoroughly with brake parts cleaner and clean shop towels.
• Install the rotor squarely against the clean hub.
• Temporarily thread one wheel nut backward by hand to hold the rotor flat during assembly.
• Do not put grease or anti-seize on the rotor face or wheel studs.

Step 8: Service the Caliper Bracket

• Use the flat-blade screwdriver to remove the old pad clips if they remain installed.
• Use the small wire brush to clean the bracket surfaces beneath the clips.
• Install the new stainless hardware clips completely into the bracket.
• Remove each guide pin by hand, wipe it clean, and inspect its rubber boot.
• Apply a thin layer of high-temperature silicone brake grease to each smooth guide pin.
• Reinstall each pin into its original position and ensure the rubber boot seals around it.

Step 9: Reinstall the Caliper Bracket

• Position the bracket over the new rotor and start both bolts by hand.
• Use the 17mm socket and 1/2-inch drive torque wrench to tighten the bracket bolts.
• Torque to 85-102 Nm (63-75 ft-lbs). This is the published workshop-manual range reported for the rear bracket bolts. paulstravelpictures.com

Step 10: Install the New Brake Pads

• Apply a very thin film of high-temperature silicone brake grease where the pad tabs contact the stainless clips.
• Keep grease away from the pad material and rotor.
• Install the inner and outer pads in the same orientation as the originals.
• Verify that both pads can slide in the clips without binding.

Step 11: Compress the Rear Caliper Piston

• Confirm again that maintenance mode is active before moving the piston.
• Position an old pad over the piston and use the rear disc-brake piston compression tool to push the piston straight inward slowly.
• Do not screw or rotate the piston. Maintenance mode allows it to compress straight inward.
• Watch the brake-fluid reservoir and stop if fluid approaches the top.
• Inspect the piston dust boot and make sure it is not twisted, pinched, or torn.

Step 12: Reinstall the Rear Caliper

• Place the caliper over the new pads without forcing it.
• Start both guide-pin bolts by hand to prevent crossed threads.
• Hold a spinning guide pin with the 19mm open-end wrench.
• Use the 14mm socket and 1/2-inch drive torque wrench to tighten the guide-pin bolts.
• Torque to 25 Nm (18 ft-lbs). howtoo.com
• Check that the brake hose and parking-brake wiring are not twisted or trapped.

Step 13: Repeat on the Opposite Side

• Repeat Steps 4 through 12 on the other rear wheel using the same tools.
• Replace pads and rotors on both sides even if only one side appears worn.
• If one side is dramatically thinner, inspect for a seized guide pin or sticking caliper before driving.

Step 14: Reinstall the Wheels

• Remove the temporary wheel nut and install each wheel.
• Start all wheel nuts by hand.
• Use the 21mm deep socket and 3/8-inch drive ratchet to snug the nuts in a star pattern.
• Use the floor jack rated 2-ton minimum to lift your CX-5 slightly, remove both stands, and lower it to the ground.
• Use the 21mm deep socket and 1/2-inch drive torque wrench to tighten the nuts in a star pattern.
• Torque to 108-147 Nm (80-108 ft-lbs). Keep the studs and wheel nuts dry and free of lubricant. mazdausa.com

Step 15: Exit Electronic Parking Brake Maintenance Mode

• Keep your foot off the brake pedal and switch the ignition on without starting the engine.
• Switch the ignition off again.
• Press and hold the accelerator pedal fully down while pulling and holding the parking-brake switch upward.
• While holding both controls, switch the ignition on within five seconds without starting the engine.
• Listen for the rear motors and verify that the amber parking-brake warning indicator turns off.
• Release the controls and switch the ignition off.

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✅ After Repair

• ✅ Before starting the engine, press the brake pedal slowly several times until it becomes firm.
• ✅ Start the engine and confirm the brake pedal remains firm.
• ✅ Apply and release the electronic parking brake twice. Confirm normal motor operation and no warning lights.
• ✅ Check the brake-fluid level and correct it only with the fluid specified on the reservoir cap.
• ✅ Look behind both rear wheels for leaking fluid, trapped wiring, or a twisted brake hose.
• ✅ Drive slowly in a safe area and verify normal stopping before entering traffic.
• ✅ Bed the new brakes with 8-10 moderate stops from about 35 mph to 10 mph, allowing brief cooling between stops.
• ✅ Avoid hard emergency-style stops and holding the brake pedal while stationary during the first 200 miles unless safety requires it.
• ✅ Stop immediately if the pedal is soft, your CX-5 pulls sharply, a rear wheel becomes unusually hot, or an EPB warning remains illuminated.

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💰 DIY vs Shop Cost

Shop Cost: $500-$850 (parts + labor)

DIY Cost: $120-$300 (parts only)

You Save: $300-$550 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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