BMW G30 Brake Calipers: GT6 Front Six-Piston Kit
Reviewed by the SteedLuxParts engineering team
Last updated September 23, 2026
BMW G30 brake calipers for a GT6 six-piston front kit: 2017–2023 5 Series body codes, 18–21 inch planning rows and a VIN-first bracket review
Set price
Quantity pricing updates automatically
$418.00
/ set
1-9 sets
Wholesale tier pricing Lower pricing for larger orders
1-9 sets
Sample or retail orders
$418.00/ set
10-49 sets
Small wholesale batch Recommended
$380.00/ set
Save $38 per set
50-199 sets
Core dealer volume
$350.00/ set
Save $68 per set
Product details
2 calipers, 2 adapter brackets, 2 brake rotors, 4 brake pads and 2 brake hoses, with the confirmed content written on the approved quotation and packing list
Shipping and lead time
Ships to
United States
Shipping
from $50.00
Delivery
about 20-35 business days
Fitment information
We check OEM wheels with the vehicle year and VIN in our database. For aftermarket wheels, we also need ET, J, spoke, and inner-barrel details.
Warranty and returns
5 years against manufacturing/quality defects only View the full returns policy.
Product information
Product Details & Fitment
The application shown on this page is a reference configuration. It is not a universal-fit claim and it is not the only vehicle application we can review.
Fitment review required
Confirm the vehicle and wheel before production
We check OEM wheels with the vehicle year and VIN in our database. For aftermarket wheels, we also need ET, J, spoke, and inner-barrel details.
- Vehicle model and year
- VIN / chassis number
- Wheel size
- OEM or aftermarket wheel
- Front calipers, rear calipers, or front and rear kit
| Brand | steedluxparts | Category | Big Brake Kits |
|---|---|---|---|
| SKU | SLP-BMWG30-BC-GT6-6P-F-KIT | Minimum order quantity | 1 set |
| Compatible Vehicles | BMW G30 saloon, with the G31 Touring and the G38 long-wheelbase saloon from China kept as separate records; the body, the build date and the market version are read from the VIN before a bracket row is released | Year Range | Model years 2017-2023 for the G30 saloon, built from November 2016 to 2023 with a facelift unveiled on 27 May 2020; no year band is published as a fitment approval |
| Supplementary Note | Standard, M Sport and M Performance brake records are kept apart, and the caliper and rotor already on the car are recorded instead of being inferred from the badge | Brake Line / Interface Notes | Two brake hoses per set; fitting type, routing across full steering travel and suspension movement are agreed before production |
| Installation Type | Confirm before order | Additional Setup Required | Depends on the vehicle |
| Brake Kit Notes | GT6 six-piston front caliper kit with planning rows of 345 or 355 mm at 18 inch, 362 or 380 mm at 19 inch, 380 or 405 mm at 20 inch and 405 mm at 21 inch, quoted only after the car and wheel file is approved | Included Brake Parts | 2 calipers, 2 adapter brackets, 2 brake rotors, 4 brake pads and 2 brake hoses, with the confirmed content written on the approved quotation and packing list |
| Warranty | 5 years against manufacturing/quality defects only | Packaging | Standard export packaging |
| Carton Size | 45 x 45 x 45 cm | Gross Weight | 45 kg |
| MOQ | 1 set |
One G30 search term, three body codes
Key takeaways
- Three bodies, one query: the G30 saloon, the G31 Touring and the G38 long-wheelbase saloon share a generation and not a bracket record.
- Two production eras: production started in November 2016, the facelift was unveiled on 27 May 2020, and the run closed in 2023, so the build date goes on the file before a rotor row does.
- Factory hardware already differs: owner threads in the last twelve months name two front rotor sizes, 348 mm and 374 mm, under the same family.
- Seven fields still need a decision: Sold As reads Left only, the install fields promise an original-part replacement with no extra work, MOQ reads 1 unit, the footer says 12 months, and the price block carries three figures.
If you searched for BMW G30 brake calipers, you are probably sitting in a 2017 to 2023 5 Series saloon. The same query also reaches the estate, the Chinese long-wheelbase car and more than one factory brake layout, so this page runs the other way round: the car and the wheels go on the record first, and the kit is named afterwards.
What a G30 buyer is really choosing
A six-piston front set is a conversion rather than a badge upgrade, and two things decide whether it works on your car: what the car already carries, and the wheel that has to sit over the caliper body.
The hardware question
A GT6 body is a fixed caliper, the type that uses pistons on both sides of the disc and cannot slide sideways the way a factory floating caliper does. Six pistons in a body that has to span the disc add width, and that width has to live inside the wheel. We make no claim about stopping distance, because tyre, pad compound and road surface still shape the shortest stop.
The record question
G30 is the saloon code. When the car is a G31 estate or a G38 long-wheelbase saloon, the bracket is a different machined part, and no catalogue label or trim badge changes that. Send the body code with the VIN and we open the record that matches the car.
Scope of this page
Front axle only. Rear calipers, rear rotors and parking-brake parts sit outside this set, and the rear parking-brake type is confirmed before a second record is opened for a rear or front-and-rear order.
The car file we open before a bracket exists
Eight control lines decide the bracket and the rotor row. Six come from the car, two from the wheel.
| Control field | On the record now | Send with the request |
|---|---|---|
| Body code and build date | No year band is published as an approval | the body code, the build date and the VIN, sent privately |
| Market version | Left and right hand drive markets are recorded separately | the market the car was sold in |
| Installed front brakes | Standard, M Sport and M Performance records are kept apart | photographs of the caliper and the rotor face |
| Original rotor measurement | Diameter and thickness are not published for this kit | the measured diameter and thickness of the rotor on the car |
| Wheel diameter and status | 18, 19, 20 and 21 inch rows are planning references | the wheel size plus original or aftermarket status |
| Aftermarket ET and J | Not supplied until the wheel is known | the ET and J values from the wheel itself |
| Spoke and inner barrel | Not supplied until the wheel is known | photographs of the spoke back and the inner barrel |
| Axle scope | Front axle kit only | front, rear or front and rear |
Original wheels are checked against our own record file using the year and the VIN, so ET and J are not requested in that case. Aftermarket wheels are different, because ET measures how far the mounting face sits from the wheel centre line and J is the rim width; both move the space the caliper has to live in. A photograph of the spoke back costs nothing, and it’s the cheapest part of the file to get right.
Rotor rows, and the clearance question owners keep raising
Planning reference only. A wheel diameter suggests a rotor row; it does not approve one. Rotor thickness, hat height, the centre bore and the mounting face are checked on the car before anything is quoted.
| Wheel reference | Rotor planning reference | Measure before release |
|---|---|---|
| 18 inch | 345 mm or 355 mm | Spoke clearance, inner barrel, rotor interface and the approved caliper template |
| 19 inch | 362 mm or 380 mm | Wheel geometry, rotor interface and the bracket position |
| 20 inch | 380 mm or 405 mm | ET and J for aftermarket wheels, spoke profile and inner barrel |
| 21 inch | 405 mm | Complete wheel envelope, hose route and installation review |
Owners tend to ask the same question one step earlier. On 2026-09-14 a G31 530d owner buying square 18x8J ET30 winter wheels wanted to know whether they clear the factory blue M Sport calipers, and the thread cites a 348 mm rotor on one car and a 374 mm rotor on another. On 2026-02-10 a 2022 540i xDrive owner asked whether a front 19×8 ET28 wheel clears the red calipers without spacers. Neither question turned on the model code.
Two shortcuts that cost money
- Reading the badge as the brake specification. A March 2026 owner thread describes a G30 moving off 348 mm front and 330 mm rear factory hardware onto M Sport brakes, so trim and hardware are separate questions.
- Skipping the build date. Production began in November 2016, the facelift landed in May 2020 and the run closed in 2023, so a bracket file without a build date is a guess.
Wheel fitment is a clearance test that includes the spokes, the barrel and the suspension travel, not just the diameter.
What ships in one front set, and what it touches
One order is a matched front package rather than two loose calipers, and the quantities are fixed before the quotation leaves.
| Component | Quantity | Interface still to check |
|---|---|---|
| Calipers | 2 GT6 six-piston bodies | Mounting ear position and the approved bracket |
| Adapter brackets | 2, machined per vehicle | Bracket offset and rotor centre line |
| Brake rotors | 2 | Diameter against the wheel envelope and the hub interface |
| Brake pads | 4 | Pad shape and compound against the supplied body |
| Brake hoses | 2 | Fitting type, routing across steering travel and suspension movement |
Installation
The adapter bracket is a vehicle-specific system: it positions the caliper on the hub. That is why installation is confirmed before the order is released, and why this file doesn’t promise that the set drops onto an unmeasured car. A qualified technician finishes the work and checks it on the car.
Calipers-only is a separate configuration. Ordered that way, the rotor, bracket, pad and hose interfaces sit with you or your workshop, and the rotor rows on this page stop applying until that combination has been reviewed. Rear parts, and the count of 4 calipers and 4 rotors behind a two-axle order, belong to a second record.
Materials on the record, claims left off it
Three material lines are on file, and they are the whole record:
- Caliper body, hat and adapter bracket: 7050 aluminium alloy.
- Brake rotors: high-carbon cast iron.
- Brake pads: ceramic friction material.
No grade sheet, no test report and no approval document sits behind those lines, so nothing here claims a manufacturing route, a road-legality status or a performance figure. The bench photographs show bodies carrying lettering that is not ours, and that lettering is a finish applied to the part; this page claims no licence, sponsorship or authorisation over any mark it does not own.
Rotor runout is a measurement requirement rather than a formality. It is the sideways wobble read on the hub, and it gets checked before the wheels go back on, because a fixed caliper has no room to slide away from it.
Buyer routes and the terms behind a quote
Importers, distributors and workshops
These buyers usually start with one set, prove it on a local car and commit to a stocking order afterwards. Their file carries the same bracket and rotor data as a retail order, plus the destination country and the quantity, so freight and paperwork land in one quotation.
Owners and repair shops replacing worn parts
This route often starts with a price shock. One owner reported a dealer quote of about 3k for pads and discs alone before asking what else fits the car. A complete front set replaces that part-by-part route, and the build starts only after the car file is approved.
MOQ is 1 set. Production runs 3–7 business days after the 30% deposit clears, delivery follows in about 20–35 business days, and the balance clears before dispatch. The warranty runs 5 years against manufacturing and quality defects; wear parts, installation errors and unauthorised changes sit outside it. The tier ladder reads USD 418 per set for 1–9 sets, USD 380 for 10–49 and USD 350 for 50–199. Those three figures cannot all describe one list price, so the struck-through USD 688.00 line and the Save $68 per unit note sit on the correction list rather than in an offer.
Six questions that decide a G30 order
Which 5 Series bodies does the G30 search cover?
G30 is the saloon, G31 the Touring and G38 a long-wheelbase saloon sold in China. The generation ran from November 2016 to 2023, with the facelift unveiled on 27 May 2020. Each body keeps its own bracket and rotor record.
Do two cars with the same code carry the same front brakes?
No. Owner reports from the last twelve months name both 348 mm and 374 mm front rotors under the same family, and one owner moved a car off 348 mm front and 330 mm rear factory hardware onto M Sport brakes. The caliper and the rotor on your car go on the file instead of the badge.
Will an 18 inch wheel clear the six-piston body?
18 inch is the first planning row, at 345 or 355 mm. Spoke shape, inner barrel, offset and the approved caliper template still decide, which is why we ask for photographs rather than a wheel diameter on its own.
How much offset room does an aftermarket wheel need?
Enough to clear the body through the full suspension travel, and that answer lives in your wheel. Send ET and J with photographs of the spokes and the inner barrel, and we check them against the caliper template before the quotation goes out.
Does one front set include rear parts?
No. One set is 2 calipers, 2 brackets, 2 rotors, 4 pads and 2 hoses, all front axle. Rear calipers, rear rotors and parking-brake parts are quoted as a second record.
Why does the price block show three different figures?
The published ladder is USD 418 per set for 1-9 sets, USD 380 for 10-49 and USD 350 for 50-199. The struck-through USD 688.00 line and the Save $68 per unit note are defects on the live record, and they sit on the correction list.
Reference photos and the next step
Three photographs sit below: the front set laid out on the bench, a packed pair with the hats marked, and a mounted corner with the rotor on the hub. They show parts, finish and packing, so they cannot stand in for a wheel measurement on your car.
This file is maintained by the SteedLuxParts fitment desk and reviewed on 2026-09-23. Sources checked: the 5 Series G30 model record for the body codes and the production window, and the brake caliper reference for the difference between floating and fixed bodies. They prove the chassis history and the caliper type; they do not approve a bracket, a rotor row or a wheel for any car.
To open a file, send the body code and the build date, the VIN privately, the market the car was sold in, photographs of the calipers and the rotor face, the rotor diameter and thickness, the wheel size with original or aftermarket status, ET and J values for aftermarket wheels, any spacer or suspension change already fitted, the destination country and the quantity. Our reply names the approved bracket and rotor row, the production and delivery window, and the price of the front set.
Fitment resources before ordering
OE lookup, wheel size, packing, RFQ.
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07 Buyer resource Solutions and technical guide.Fitment, installation and packing checks.
08 Buyer resource Buyer application scenarios.Sourcing workflows for international buyers.
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