Revised 11/24/2023
This page is evolving as we continue to find exceptions and changes made in the middle of production.
The brake options on the G20 3-series and G22 4-series are much less confusing than their predecessors but there is still some confusion that needs clearing up. Luckily, it seems internet forums have already caught on to the differences and we included links to them below.
There are five factory brake options offered on G20 3-series and G22 4-series: 30i standard, 30i M Sport, M40i standard, Motorsport Engineering, and M Performance.
330i/430i/230i Standard Brakes
Base model brakes with single-piston sliding calipers front and rear.The pads look familiar since this a traditional caliper type.
Front Rotor: 330x24mm, 1-piece, blank face rotors
Rear Rotor: 330x20mm, 1-piece, blank face rotors
Front Caliper: 1-piston, sliding, grey/unfinished
Rear Caliper:1-piston, sliding, grey/unfinished
330i/430i/230i M Sport Brakes
If the M Sport package was selected at the time of ordering the brakes were upgraded to M340i/M440i specs. See below.
Note: the cutoff dates noted below for the pads also applies to 330i/430i/230i with M Sport.
Sometime in 2022 BMW stopped using the S02NH or 02NH code for the M Sport brakes. They adopted 03M1 (blue), 03M2 (red), and 03M3 (black) codes for the M Sport brakes. The G20 still uses the 02NH code but the G42 uses 03Mx. Pretty minor update to the nomenclature but the familiar “02NH” code may be phased out after 2022.
M340i/M440i/M240i Standard Brakes (M Sport)
As a full M Sport model the M340i (G20), M440i (G22), and M240i (G42) received appropriate M Sport brake upgrades. These are Brembo 4-piston fixed calipers in the front and single-piston sliding calipers in the rear. These were offered in either blue or red color.The M Sport pads are unique to match the size of the M Sport 348mm rotor.
A change in the caliper and pad for 2023 meant a new pad part number and shape. The change began in March 2022 (3/2023) so some very late-production 2022 models also received the new brakes. Visually, the calipers look almost identical. No other changes were made to the brakes, hub, bearing, or suspension. The change appears minor but will affect replacement parts. No changes were made to any rear brake components aside from part number updates.
2020-2/2022 front pad: 34116889570, 125.8 x 94.7mm
3/2022+ front pad: 34108844368, 125.9 x 98.8mm
Front Rotor: 348x36mm, 2-piece, blank face rotors
Rear Rotor: 345x24mm, 2-piece, blank face rotors
Front Caliper: 4-piston, fixed, blue or red
Rear Caliper:1-piston, sliding, blue or red
M340i/M440i/M240i Motorsport Engineering/Track Package Option
In the BMW parts diagrams there is a listing for the "Motorsport Engineering" optional brakes. It's option code 033 (aka S033T or 033T or ZTK). We think this is a rare option and may not be offered in all markets. It was not offered for 330i/430i. The rotor size was increased to 374mm and the fixed caliper was changed for the extra 26mm of rotor diameter. Although the calipers look almost identical - and share some of the same components - they are slightly different. The pads are also different with the larger brakes getting a larger pad (127.7 x 117.4mm). The rear caliper remained a sliding single-piston design. These calipers were also offered as blue or red color. These brakes should clear most 18" wheels, however, BMW required 19" wheels when the package was ordered.
The pad changes for the standard M Sport brakes have no effect on the Motorsport Engineering brakes.
Front Rotor: 374x36mm, 2-piece, blank face rotors
Rear Rotor: 345x24mm, 2-piece, blank face rotors
Front Caliper: 4-piston, fixed, blue or red
Rear Caliper:1-piston, sliding, blue or red
M Performance Accessory Brakes (all models)
Available from the Accessories catalog, the M Performance brakes are a dealer-installed option. These match the specs of the Motorsport Engineering brakes but were only offered in the red color. The pads are the same as the ZTK track brakes. These brakes should clear most 18" wheels.
The pad changes for the standard M Sport brakes have no effect on the M Performance brakes.
Front Rotor: 374x36mm, 2-piece, dimpled & slotted rotors
Rear Rotor: 345x24mm, 2-piece, dimpled & slottedrotors
Front Caliper: 4-piston, fixed, red
Rear Caliper:1-piston, sliding, red
How To Tell
You can't tell which brakes you have by the color. Just because you have red calipers does not mean you have an optional brake kit.
You can't tell which brakes you have by the caliper - they are extremely similar in appearance.
The best way we have found so far is to measure from the exact middle of your wheel center cap to the outer edge of your brake rotor. Over 7 inches is the 374mm rotor; under 7 inches is the 348mm rotor.
Checking size on G20/G22 brakes. Click for larger.
Other M Sport Models
Unfortunately, the name M Sport continues to confuse everyone. This is frustrating when you're discussing brake specs and an M Sport brake pad for a G30 540i is not the same as a M Sport brake pad on a G20 M340i. They're both M Sport packages but the brakes on a 540i M Sport are larger and use a different pad than on a M340i. To make matters worse, the 540i M Sport brake pad is the same as the M Performance pad on the M340i! When is an M Sport pad not for M Sport models? When it's for M340i M Performance brakes! We've been trying to sort out the M Sport quagmire for over ten years now and we think we have improved the clarity but we're afraid it will never be crystal clear.
Read More
Need help identifying which brakes I have. (g20.bimmerpost)
The M340i's ZTK Cooling and HP Tire Package is impressive (g20.bimmerpost)
New Track Package for the M340i in Canada (g20.bimmerpost)
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