🔧 CX-9 - Rear Brake Pad Replacement

Replacing the rear brake pads involves lifting the rear of your CX-9, removing the rear calipers, swapping in new pads, and then restoring the brake system so it works safely and quietly.

The key detail on your CX-9 is whether it uses an Electronic Parking Brake (EPB) (a parking brake controlled by a button and an electric motor in the rear calipers). If it does, the EPB must be put into service mode before you push the pistons back.

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

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⚠️ Safety & Precautions

• ⚠️ Support the CX-9 on jack stands before working under/near the wheels.
• ⚠️ If your CX-9 has EPB, do not force the rear pistons back until EPB is in service mode (you can damage the caliper motor).
• ⚠️ Brake dust is irritating—wear safety glasses and a dust mask.
• ⚠️ Never press the brake pedal with a caliper removed.
• ⚠️ Keep brake fluid off paint; it removes paint fast.

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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
• 1/2" drive breaker bar
• 1/2" drive torque wrench (30-150 ft-lbs)
• 3/8" drive ratchet
• 3/8" drive torque wrench (10-80 ft-lbs)
• Socket set (8mm-19mm)
• Allen key set (metric)
• Torque bit set (Torx)
• Flat trim tool
• Brake caliper piston compression tool (specialty)
• Bungee cord
• Brake parts cleaner
• Wire brush
• Small pick tool
• Disposable gloves
• Safety glasses
• Dust mask
• 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 pad hardware kit (clips/shims) - Qty: 1
• Brake lubricant (silicone brake grease) - Qty: 1
• Brake cleaner - Qty: 2
• Brake fluid (DOT 3) - Qty: 1 quart

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📋 Before You Begin

• Park on level ground, put the shifter in P, and chock the front wheels.
• Confirm whether your CX-9 has an EPB button near the shifter (this changes the procedure).
• Check the brake fluid level in the reservoir; pushing pistons back can raise the level. Remove a little fluid only if it’s at the max line.
• Two quick questions so I can give you the exact EPB steps and correct torque specs:
  • Does your CX-9 have an electronic parking brake button, or a foot pedal/hand lever?
  • Do you have a scan tool that can run EPB service/maintenance mode?

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Get ready and loosen the rear wheels

• Use a 21mm socket and breaker bar to loosen the rear lug nuts 1/2 turn (do not remove them yet).

Step 2: Lift and support the rear

• Lift the rear using a floor jack (rated 3-ton minimum) at the correct rear jacking point.
• Set the vehicle down onto jack stands (rated 3-ton minimum).
• Finish removing the lug nuts with the 21mm socket and remove both rear wheels.

Step 3: Identify EPB and stop here if it’s electronic

• Look at the rear caliper: if there is an electrical connector/motor on the caliper, it uses EPB.
• If EPB is present, you must put the system into service mode before compressing the pistons.
• Reply to my two questions above and I’ll give the exact EPB steps.

Step 4: Remove the rear caliper from the bracket

• Use the appropriate socket set (8mm-19mm) or Allen key set (metric) to remove the caliper slide pin bolts (exact head type varies by caliper).
• Lift the caliper off the pads and support it with a bungee cord (do not let it hang by the brake hose).

Step 5: Remove old pads and hardware

• Pull the inner and outer pads out by hand.
• Use a small pick tool and flat trim tool to remove the old pad clips/hardware from the bracket.

Step 6: Clean and prep the bracket

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

Step 7: Retract the caliper piston

• Use a brake caliper piston compression tool (specialty) to push the piston back slowly and evenly.
• Stop if you feel abnormal resistance; EPB may not be in service mode.

Step 8: Install new rear pads

• Apply a thin layer of brake lubricant (silicone brake grease) to pad ears where they slide in the clips (do not get grease on pad friction material).
• Install the new pads into the bracket in the same orientation as the old ones.

Step 9: Reinstall the caliper

• Set the caliper back over the new pads.
• Install and tighten the slide pin bolts using the same socket set (8mm-19mm) or Allen key set (metric) used for removal.
• Torque to Mazda specification (I’ll provide the exact number once you answer the two questions above so it matches your EPB/non-EPB setup).

Step 10: Reinstall wheels

• Reinstall both wheels and hand-thread the lug nuts.
• Lower the CX-9 and use a 1/2" drive torque wrench (30-150 ft-lbs) with a 21mm socket to tighten lug nuts in a star pattern.
• Torque to Mazda specification (I’ll confirm the exact lug torque for your CX-9 once you reply).

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✅ After Repair

• Pump the brake pedal slowly 10-15 times until it feels firm (this seats the pads).
• Check brake fluid level and top off with DOT 3 if needed.
• If EPB-equipped: exit EPB service mode and confirm the parking brake applies/releases normally.
• Do a low-speed test drive and listen for grinding or pulling.
• New pads need gentle stops for 150-200 miles.

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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.