2020-2026+ Mercedes-Benz GLS-Class / AMG (X167) Carbon Ceramic Big Brake Kit — Brembo AMG 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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Will This Fit My Car?
Full Upgrade CCB Big Brake Kits (With Calipers) for the 2020-2026+ Mercedes-Benz GLS-Class / AMG (X167). This page's exact brake setup:
| Model Years | Front Setup | Rear Setup | Min. Wheel Size |
|---|---|---|---|
| 2020-2026+ | OEM AMG 6-Piston Caliper / 400mm | OEM AMG EPB Single-Piston Caliper / 370mm | 20" |
Fitment here is bespoke: brackets, hat offsets, and caliper mounting are engineered for your exact model and trim rather than copied across the platform. Two trims with the same chassis code can still differ in knuckles, hub geometry, and wheel ET clearance — which is why we confirm your trim first, then build the matched system of calipers, pads, rotor hats, floating hardware, and lines for it. Modified knuckles, uprights, or non-factory suspension points require review before ordering.
The 400 mm rotor sets the minimum wheel size at 20" — smaller wheels will not clear the caliper and rotor. Spoke profile and offset also affect clearance; confirm your exact wheels before ordering.
| Wheel Size (Standard) | Disc Range |
|---|---|
| 15" | 260 mm – 285 mm |
| 16" | 285 mm – 300 mm |
| 17" | 300 mm – 330 mm |
| 18" | 330 mm – 355 mm |
| 19" | 355 mm – 380 mm |
| 20" | 380 mm – 400 mm |
| 21" | 400 mm – 420 mm |
| 22" | 420 mm – 440 mm |
What's in the Box
| Item | Details |
|---|---|
| Product type | Full Upgrade CCB Big Brake Kits (With Calipers) |
| Front calipers | OEM AMG 6-Piston Caliper OE / Part No.: L 205-421-69-98 · R 205-421-70-98 |
| Front CCB rotors | 400mm |
| Rear calipers | OEM AMG EPB Single-Piston Caliper OE / Part No.: L 231-423-03-81 · R 231-423-04-81 |
| Rear CCB rotors | 370mm |
| CCB brake pads | Matched ceramic-compatible compound for the supplied StopFlex carbon ceramic rotors |
| Rotor hats and floating hardware | Vehicle-specific hardware package |
| Brake lines | Included for complete kit-upgrade orders |
| Order scope | Default listing is full-car set when front and rear are specified. Front-only or rear-only orders can be arranged after confirmation. |
Make It Yours — Color & Logo Customization
Every StopFlex kit order can be finished with custom caliper colors, a custom caliper logo, and custom rotor hat colors — the brake package matches your exact build, not a fixed off-the-shelf look.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
Why Carbon Ceramic — and Why StopFlex
Continuous Fiber Construction
StopFlex discs are built with long continuous carbon fiber instead of chopped short fiber. Continuous strands carry load across the whole rotor body, raising strength and thermal durability under heat cycles.
Bespoke Per-Vehicle Engineering
Every order is machined to the confirmed vehicle and trim. Brackets, hat offsets, and pad shapes are built for that exact car — never pulled from a one-size-fits-all catalog.
CCB-Specific Pad Compound
A low-metallic resin pad compound reinforced with steel, copper, and aramid fiber, made for ceramic discs: stable to about 750 °C, roughly 0.44 average friction, strong fade resistance, low rotor wear.
Lower Unsprung Mass
A carbon-ceramic rotor weighs roughly half of the equivalent iron disc. Less rotating, unsprung mass lets the suspension follow broken pavement more cleanly and makes steering response noticeably sharper.
High-Temperature Stability
The carbon-silicon-carbide friction matrix keeps working at temperatures that push iron rotors into heavy fade, so the tenth hard stop feels like the first — same pedal travel, same bite point.
Rust-Free Rotor Surface
Ceramic discs cannot flash-rust. After rain, a wash, or weeks of parking, the rotor face behind your open-spoke wheels stays clean — no orange ring on a freshly detailed car.
Long Street-Service Life
In normal road use with matched pads and correct bedding, one StopFlex CCB rotor set is engineered to outlast several sets of iron replacement rotors, recovering part of the up-front cost.
Low Visible Dust
Matched with StopFlex pads, the system sheds a fraction of the dust an iron rotor and pad combination throws. Wheels stay clean for weeks of driving instead of days.
Premium Ceramic-Glaze Finish
StopFlex's proprietary coating gives the disc a bright ceramic-glaze surface with subtle texture — the factory carbon-ceramic look, clearly visible through open wheel designs.
Winter & Cold-Weather Braking
A cold, untuned carbon-ceramic disc needs more pedal than iron on the first winter stops — normal material physics. StopFlex engineered the pad formula and disc coating specifically for cold starts, closing that gap: cold-car winter feel is now very close to summer feel. Keep a little extra distance on the coldest mornings; for harsh winters, choose Street Spec.
Caliper Overview
Front Caliper
Front braking uses the OEM AMG 6-Piston Caliper clamping a 400mm carbon-ceramic rotor. Six pistons spread clamp load evenly across a large pad, so pedal feel stays consistent as the disc heats during repeated hard stops in a heavy three-row SUV.
Rear Caliper
The rear runs the OEM AMG EPB Single-Piston Caliper on a 370mm carbon-ceramic rotor. It adds rear thermal capacity for high-mass, high-speed slowing while keeping the factory electronic parking brake fully functional.
Choose Your Rotor: Street, Track-Day, or Motorsport
Street Spec
Ceramic coating, cross-drilled face, and large cooling channels.
Best for daily driving and premium street builds that need clean cold bite, low dust, corrosion-free appearance, and long service life.
Track-Day Spec
Ceramic coating, blank face, and honeycomb cooling channels.
Best for fast-road and track-day use where repeated braking stability matters more than maximum visual drilling style.
Motorsport Spec
Uncoated blank face with honeycomb cooling channels.
Best for race-focused builds that run competition pads, high-temperature fluid, cooling strategy, and a proper warm-up window. Not the default street choice.
Heat Management Note
High rotor temperature tolerance does not mean heat management disappears. Under repeated hard braking, heat migrates into the pads, brake fluid, seals, calipers, and wheels even when the ceramic disc itself is comfortable. Plan brake cooling and high-temperature fluid for extended track sessions, long mountain descents, or sustained aggressive driving.
Get Your Fitment Confirmed
Send the exact vehicle details, current rotor sizes, and caliper type before ordering. Every StopFlex order is confirmed against your VIN-level configuration before production.
FAQ
How do these carbon-ceramic brakes behave on a cold winter morning?
An untuned carbon-ceramic disc bites less than cold iron on the first stops—that's normal physics, not a fault. StopFlex tunes both the low-metallic resin-composite pad and the disc's ceramic coating for cold starts, so cold-car feel on the GLS now comes very close to summer feel. On the coldest first stops, leave a little extra following distance until the front 400mm rotors reach working temperature.
Will this kit fit my exact GLS trim, or is it a platform-wide bolt-on?
It's bespoke-engineered for your confirmed X167 trim, not assumed from the chassis name. A GLS63 AMG can carry different front knuckles, hub geometry, and wheel clearance than a GLS450 or GLS580, so we match the brackets, rotor-hat offsets, and caliper mounting to your specific car. We confirm your VIN and trim before building—no universal-fit claims.
What wheels do I need to clear these brakes?
The front rotor is 400mm, so 20-inch wheels are the minimum. Anything under 20 inches will not clear the rotor, and spoke shape matters too—some 20-inch designs sit too close to the OEM AMG 6-Piston Caliper. Send us your wheel model and we'll verify clearance before you order.
Does the rear caliper keep my electronic parking brake working?
Yes. The X167 GLS uses a factory EPB built into the rear caliper. The OEM AMG EPB Single-Piston Caliper in this kit retains full electronic parking brake operation on the 370mm rear rotor, so hold assist and auto-engage functions work exactly as they do stock.
More Contact Information
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