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


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.
🎯 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.

















