Recall 20V346 affects 24,037 2020 Mazda MAZDA3 and CX-30 vehicles for loose front brake caliper bolts. Repair is free at any franchised Mazda dealer.
Mazda is recalling 24,037 2020 MAZDA3 and CX-30 vehicles because front brake caliper mounting bolts can be loose from improper assembly. Loose calipers can reduce braking performance or interfere with wheel rotation, affecting handling and increasing crash risk; Mazda dealers will complete the recall repair free of charge.
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What's wrong?
The front brake caliper on a 2020 Mazda MAZDA3 or CX-30 holds the brake pads around the front brake rotor. When you press the brake pedal, hydraulic pressure pushes the caliper so the pads clamp the rotor and slow the vehicle. The caliper has to stay firmly mounted so the pads meet the rotor squarely.
On affected Mazda vehicles, a manufacturing assembly error left certain front brake caliper mounting bolts below the proper torque specification. That means the bolts were not tightened enough during assembly. As the vehicle is driven, those bolts can loosen and let the caliper shift out of place. If the bolts fall out, the repair calls for replacement brake calipers with properly tightened mounting bolts.
Drivers can hear abnormal grinding or rattling if the loose caliper contacts the wheel or other nearby parts. That noise is the warning sign to take seriously.
Who's affected?
The scope includes both the MAZDA3 and CX-30, and both use the same front brake caliper family in the hydraulic brake system.
| 2020 Mazda MAZDA3 | hydraulic brake system |
|---|---|
| 2020 Mazda CX-30 | hydraulic brake system |
| Units affected | 24,037 |
A matching 2020 Mazda model does not guarantee inclusion. Check your VIN to confirm whether your specific vehicle is included.
What's the safety risk?
Loose brake calipers can reduce braking performance or interfere with wheel rotation, which affects handling and increases crash risk. Grinding or rattling from the front wheels is a warning sign, especially if the caliper contacts the wheel or nearby parts. Drive cautiously and schedule the inspection soon. Repair is free at any franchised Mazda dealer.
What should I do?
- Check your VIN to confirm your 2020 Mazda MAZDA3 or CX-30 is included in this recall.
- Contact your nearest franchised Mazda dealer to schedule the free front brake caliper bolt inspection and tightening that secures the calipers, with caliper replacement if bolts are missing.
- Bring the owner letter if you have it, and reference recall number 20V346 when you call.
- Drive cautiously until the repair is complete. Leave extra following distance and stop using the vehicle if braking feels abnormal or a wheel drags.
- Call Mazda customer service at 1-800-222-5500, Option 4, with questions about the repair.
What happens at the repair
At the dealer, a Mazda technician inspects the front brake caliper mounting bolts and tightens any bolts that were not tightened properly during assembly. If bolts are missing, the affected front brake caliper is replaced. The recall repair is free, including covered parts and labor. Mazda is not offering a separate reimbursement program because these 2020 MAZDA3 and CX-30 vehicles are covered by the new vehicle warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| June 12, 2020 | NHTSA published the recall |
|---|---|
| June 17, 2020 | Dealer notification began |
| June 17, 2020 | Dealer notification ended |
| July 24, 2020 | Owner notification mailed |
| August 11, 2020 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 20V346?
Recall 20V346 covers 24,037 2020 Mazda MAZDA3 and CX-30 vehicles with front brake caliper mounting bolts that were not tightened properly during assembly. Loose calipers can reduce braking performance or interfere with wheel rotation. Mazda dealers inspect and tighten the bolts for free.
What should I do if my 2020 Mazda MAZDA3 or CX-30 is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 20V346. If it is, contact a franchised Mazda dealer to schedule the front brake caliper bolt inspection. The dealer will tighten the bolts or replace the affected caliper if bolts are missing. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to perform the recall repair at no cost, and Mazda's remedy for recall 20V346 says repairs will be performed free of charge. Any franchised Mazda dealer can inspect and tighten the front brake caliper bolts.
What is the safety risk?
The safety risk is reduced braking performance or interference with wheel rotation in recall 20V346. Either condition can affect vehicle handling and increase crash risk. If your VIN is included, schedule the free Mazda dealer repair and reference recall 20V346 when you call.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/20V346000 |
|---|---|
| Mazda customer service | 1-800-222-5500 |
| NHTSA recall # | 20V346 |
| NHTSA recall # (full) | 20V346000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Misc. Document (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 23, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →