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2020 Mazda CX-30
2020 Mazda CX-30
Select - Inline 4 2.5L
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How to:  Replace Rear Brakes.  Rotors & Pads.  Mazda CX-30

How to: Replace Rear Brakes. Rotors & Pads. Mazda CX-30

Suggested Parts

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Tools & Fluids

3 Ton
3 Ton
Floor Jack
3 Ton
3 Ton
Jack Stands
Wheel Chocks
Wheel Chocks
21mm
21mm
Socket
or (13/16")
1/2
1/2
Breaker Bar
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How to Replace Rear Brake Pads & Rotors on a 2020 Mazda CX-30 (EPB Service Mode)

Step-by-step DIY rear brake job with required tools/parts, safety tips, and torque specs guidance

How to Replace Rear Brake Pads & Rotors on a 2020 Mazda CX-30 (EPB Service Mode)

Step-by-step DIY rear brake job with required tools/parts, safety tips, and torque specs guidance

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đź”§ CX-30 - Rear Brake Pads & Rotor Replacement

Replacing the rear brake pads and rotors on your CX-30 requires retracting the rear caliper pistons and correctly handling the electronic parking brake (EPB) system (if equipped). The key is putting the EPB into service/maintenance mode first—otherwise you can damage the rear calipers.

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


⚠️ Safety & Precautions

  • ⚠️ Never push rear pistons back until the EPB is in service/maintenance mode.
  • ⚠️ Support your CX-30 with jack stands; never rely on a jack alone.
  • ⚠️ Brake dust is harmful—avoid blowing it with compressed air.
  • ⚠️ If you disconnect the battery, keep the liftgate closed and windows up.

đź”§ 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
  • Lug nut socket (21mm)
  • Breaker bar (1/2")
  • Torque wrench (10-200 ft-lbs range)
  • Ratchet (3/8")
  • Socket set (10mm-19mm)
  • Wrench set (10mm-19mm)
  • Caliper piston compression tool (specialty)
  • Flat-blade screwdriver
  • Brake cleaner spray
  • Wire brush
  • Bungee cord
  • Nitrile gloves
  • Safety glasses

🔩 Required Parts

HowToo sells all the parts you need for this repair:

  • Rear brake pad set - Qty: 1
  • Rear brake rotors - Qty: 2
  • Brake hardware kit (rear) - Qty: 1
  • Brake caliper grease (silicone) - Qty: 1
  • Brake cleaner - Qty: 1

đź“‹ Before You Begin

  • Park on level ground, steering straight, and chock the front wheels.
  • Make sure your key fob is away from the vehicle so the EPB doesn’t auto-apply.
  • Open the hood and locate the brake fluid reservoir (you’ll check level during piston compression).
  • Answer the two quick questions below so I can give you the correct EPB service-mode steps and factory torque specs.

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm your EPB setup (needed before I give the exact procedure)

  • Do you have an electronic parking brake switch on the console (a small switch/button), or a foot parking brake pedal?
  • Do you have a scan tool that can put the EPB into Maintenance/Service Mode (Autel/Launch/etc.), or will you need a no-scan-tool method if available?

Step 2: (Pending your answers) I’ll provide the exact EPB service-mode steps + factory torque specs

  • Once you reply, I’ll generate the full, exact CX-30 rear pads/rotors procedure with Torque to XX Nm (YY ft-lbs) values for: wheel nuts, caliper bolts, bracket bolts, and any rotor fasteners.

âś… After Repair

  • After I tailor the procedure for your EPB type, I’ll include the correct bedding-in (break-in) steps for the new pads and how to confirm the EPB operates normally.

đź’° DIY vs Shop Cost

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

DIY Cost: $160-$420 (parts only)

You Save: $290-$430 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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