Mazda Cx-30, Mazda Mazda3, model year 2020. Filed by Mazda North American Operations and reported to NHTSA on 12 June 2020. 24,037 vehicles potentially affected.
What the notice says Mazda North American Operations (Mazda) is recalling certain 2020 CX-30 and Mazda3 vehicles. The front brake caliper mounting bolts may not have been tightened properly during assembly, possibly allowing the calipers to loosen.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Mazda's own number for this recall: 4420F. That is the number on the owner letter and on the dealer paperwork. 20V346 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 20V346 cover?
- Mazda Cx-30, Mazda Mazda3, model year 2020.
- What is wrong with them?
- Mazda North American Operations (Mazda) is recalling certain 2020 CX-30 and Mazda3 vehicles. The front brake caliper mounting bolts may not have been tightened properly during assembly, possibly allowing the calipers to loosen.
- What can happen if it is not put right?
- Loose brake calipers can reduce braking performance or interfere with wheel rotation, affecting vehicle handling. Either of these scenarios can increase the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. Mazda will notify owners, and dealers will inspect the front brake caliper bolts, tightening them as necessary. If bolts are missing, the affected brake caliper will be replaced. Repairs will be performed free of charge. The recall began July 24, 2020.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Mazda calls this recall 4420F, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “Loose brake calipers can reduce braking performance or interfere with wheel rotation, affecting vehicle handling. Either of these scenarios can increase the risk of a crash.”
affected
in the notice
caught
| Campaign | 20V346 |
|---|---|
| Filed by | Mazda North American Operations |
| System at fault | Service Brakes, Hydraulic:Foundation Components:Disc:Caliper |
| Reported to NHTSA | 12 June 2020 |
| Model years | 2020-2020 |
| Vehicles named | MAZDA CX-30, MAZDA MAZDA3 |
What the notice says today
The consequence
Loose brake calipers can reduce braking performance or interfere with wheel rotation, affecting vehicle handling. Either of these scenarios can increase the risk of a crash.
The remedy
Mazda will notify owners, and dealers will inspect the front brake caliper bolts, tightening them as necessary. If bolts are missing, the affected brake caliper will be replaced. Repairs will be performed free of charge. The recall began July 24, 2020. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 4420F.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 583 notices in the record whose component field names service brakes, hydraulic. Across that group the median wait before owners were written to was 37 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 20V346, wording as read on 16 September 2026. https://carsmultiverse.com/recall/20v346/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Mazda notices we hold
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- 25V568: 2024-2025 CX-90 and 2025 CX-70 mild hybrid electric
- 25V418: 2025 CX-50 Hybrid
- 25V413: CX-50 Hybrid and CX-50
- 25V357: 2024-2025 Mazda3 and CX30
- 25V336: 2024-2025 Mazda MX-5
- 25V167: 2024-2025 CX-50
- 24V817: 2024 CX-90 and 2025 CX-70 plug-in hybrid electric
All 99 Mazda campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 20V346 on 23 August 2026, they were:
- Defect summary
665e071c - Consequence
d0f92975 - Remedy
0ea7ae91
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 20V346 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Mazda Mazda3, in all seven, is kept on that vehicle's own page, with the newest in each.
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