Short answer
DENUE lists 35 brake parts plants with 11 or more staff in Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 34 have 51 or more staff, and 21 of those match an IMMEX program on exact name and postal code. Querétaro has the most, with 13. Each plant still needs its own checks.
Key facts
- Activity codes (SCIAN)
- 336340
- Plants, 11+ staff
- 35
- Data
- INEGI DENUE bulk files, 25 Sep 2026; IMMEX directory, August 2026 edition
About brake parts
Brake parts are safety critical and a small group in the Bajío: nearly all the plants below have 51 or more staff.
The numbers by state
| State | Plants, 11+ staff | With 51+ staff | With an IMMEX match |
|---|---|---|---|
| Querétaro | 13 | 12 | 7 |
| Guanajuato | 10 | 10 | 6 |
| San Luis Potosí | 9 | 9 | 7 |
| Aguascalientes | 3 | 3 | 1 |
| Four states | 35 | 34 | 21 |
| Staff band | Plants |
|---|---|
| 11 to 30 | 1 |
| 31 to 50 | 0 |
| 51 to 100 | 5 |
| 101 to 250 | 9 |
| 251 or more | 20 |
What to ask a brake parts supplier
Registries show that a plant exists and exports. These questions cover what they cannot.
- IATF 16949 certificate, confirmed with the issuing body.
- Testing capability, in house or through a lab.
- Traceability and containment procedures.
- Approvals required in the destination market.
- Customers already served from the plant.
Checks before you approach a plant
- Confirm the plant in DENUEName, address, activity code and staff band.
- Check its IMMEX programStatus and type, matched on legal name and postal code.
- Search the SAT 69-B listBy RFC where you have it, otherwise by exact name.
The verification guide explains each step and where it stops.
Frequently asked questions
How many brake parts plants are in the Bajío?
INEGI’s DENUE lists 35 brake parts plants with 11 or more staff across Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 34 of them have 51 or more staff. Testigo counted these from INEGI’s bulk files on 25 September 2026.
Which Bajío state has the most brake parts plants?
Among the four states Testigo counted, Querétaro has the most brake parts plants in DENUE, with 13 of 35, followed by Guanajuato (10). Plants elsewhere in Mexico are outside Testigo’s pilot, and counts are establishments in INEGI’s directory as of 25 September 2026.
Do brake parts plants in the Bajío export under IMMEX?
Some do. 21 of the 35 plants match an IMMEX program on exact name and postal code, and 21 of the 34 with 51 or more staff. A plant with no match may still export through a shelter company’s program, so ask which entity holds it.