BMW M-Performance 3-Series G20 / G21 | 4-Series G22 / G23 | i4 G26 Front 4 POT & Rear 1 POT Brake Retrofit Kit
Add stronger, more consistent stopping power on the BMW 3-Series/4-Series/i4 G20/G21/G22 with this oem-style brake retrofit kit. Multi-piston calipers and larger discs are a proven track-day and street performance upgrade when wheel clearance and fitment are confirmed.
Listing highlights: 4-piston calipers, 374x36mm discs. This listing notes genuine / OEM-oriented hardware where stated in the title or body.
Package Includes
- 2 x BMW M Performance Brake Disc front (left/right); 375 x 36 mm
- 2 x BMW M Performance Brake Disc rear (left/right); 345 x 24 mm
- 2 x BMW M Performance Fixed Caliper 4 POT front (left/right);
- 2 x BMW M Performance Fixed Caliper 1 POT rear (left/right);
- 8 x BMW Brake Pads (front & rear);
- 1 x BMW Brake Cylinder
- Application reference
- BMW 3 series G20 G21 (2017-2019+)
- BMW 4 series G22 (2021+)
- BMW 4 series i4 G26 (2023+)
Key features
-
BMW hardware — brand / system called out on this listing
-
4-piston calipers — multi-piston clamping for firmer pedal feel and pad area
-
374x36mm discs — diameter / thickness called out in the title or description
-
OEM-style retrofit path — designed around factory-style brackets / hubs when chassis matches
Fitment
Designed for the BMW 3-Series/4-Series/i4 G20/G21/G22. Confirm your chassis code (G20, G21, G22, G23, G26), wheel clearance for the listed disc diameter, hub / bolt pattern and caliper bracket compatibility before ordering; send wheel size and a caliper photo if you want a fitment check.
- Fits: BMW 3-Series/4-Series/i4 G20/G21/G22 when hubs, offsets, and brake package match the listing
- Larger discs may require larger wheels / specific spokes — verify clearance
- Options: Caliper Colors: Red, Blue
- Professional installation and proper bedding procedure are recommended
Specifications
| Part |
OEM-style brake retrofit kit |
| Vehicle |
BMW 3-Series/4-Series/i4 G20/G21/G22 |
| Calipers |
4-piston |
| Disc size |
374x36mm |
| Brand / system |
StopFlex |
| Install |
Professional install recommended; verify wheel clearance |
FAQ
Will this fit my BMW?
It is listed for the BMW 3-Series/4-Series/i4 G20/G21/G22 (chassis cues: G20/G21/G22/G23/G26). Other generations, hubs, or brake packages can differ — match year, chassis, and current caliper/disc setup before ordering.
What is included in the kit?
See the Key features / Kit includes section and product photos on this page for the pack-out. Message CarGym if you need a written contents list before ordering.
What disc size is listed?
The listing highlights 374x36mm. Verify this diameter clears your wheels and matches the caliper kit.
Do I need professional installation?
Yes — brake work affects safety. Have a qualified technician install, torque, bleed, and bed the system to the manufacturer guidance for this kit.
Ships worldwide from CarGym — priced and payable in all major currencies.
