2017-2019 Mercedes-Benz GLS-Class / AMG (X166) CCB Big Brake Kit | OEM AMG 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2017-2019 Mercedes-Benz GLS450 / GLS550 / GLS63 (X166) CCB Big Brake Kit — Genuine OEM AMG 6-Piston Caliper Front + Genuine OEM AMG EPB Single-Piston Caliper Rear Setup
The 2017-2019 GLS450, GLS550, and GLS63 put full-size SUV mass through brakes that can see heat, dust, and rotor wear quickly in mountain driving, towing use, repeated highway stops, and aggressive street driving. This StopFlex kit uses a 390mm front carbon-ceramic rotor with a Genuine OEM AMG 6-Piston Caliper and a 345mm rear carbon-ceramic rotor with a Genuine OEM AMG EPB Single-Piston Caliper to add thermal capacity, reduce iron dust, and cut rotating mass at all four corners. Each kit is engineered after the exact trim is confirmed, because X166 standard and AMG variants can differ in knuckle, hub, offset, and wheel-clearance requirements.
- 390mm front carbon-ceramic rotors require 20-inch or larger wheels on the GLS X166; spoke clearance must still be checked before production.
- Front braking is handled by the Genuine OEM AMG 6-Piston Caliper, paired to the 390mm rotor for higher pad support and consistent pedal feel under repeated stops.
- The rear package uses a 345mm carbon-ceramic rotor with a Genuine OEM AMG EPB Single-Piston Caliper so the GLS electronic parking brake function is retained.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz GLS450 / GLS550 / GLS63 (X166) |
| Model years | 2017-2019 |
| Front setup | Genuine OEM AMG 6-Piston Caliper / 390mm |
| Rear setup | Genuine OEM AMG EPB Single-Piston Caliper / 345mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 20" (for the 390 mm front rotor) |
Every StopFlex kit is bespoke-engineered for your exact model and trim — the brackets, rotor-hat offsets, and caliper mounting are matched to your specific car, not assumed from the platform. This matters because trims that share a chassis name can differ mechanically: a pure M or performance variant often carries different front knuckles/uprights, hub geometry, and wheel axial (ET) clearance than the standard models in the same family, so a bracket and hat offset that bolt onto one are not the same parts that fit the other. StopFlex supplies the calipers, pads, rotor hats, floating hardware, and brake lines as a matched system built to your confirmed trim. Cars with modified knuckles, modified uprights, or non-factory suspension mounting points must be reviewed before ordering and are not treated as direct-fit.
This setup uses a 390 mm front rotor, so the minimum wheel size is 20". Wheels under 20" will not clear the caliper and rotor, and spoke profile and offset affect clearance too — 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 |
Caliper Overview — Front & Rear Balance
Front Caliper (Primary Upgrade)
The front upgrade uses the Genuine OEM AMG 6-Piston Caliper, giving the 390mm rotor a rigid multi-piston clamp layout that spreads pad pressure across the swept area and improves pedal consistency under heat. Its OEM AMG provenance matters on a heavy X166 SUV because the caliper architecture was developed for factory performance braking rather than adapted from a generic aftermarket body. The caliper is supplied as part of the matched StopFlex package with trim-specific mounting and rotor-hat geometry.
Rear Caliper (Balance)
The rear uses the Genuine OEM AMG EPB Single-Piston Caliper with a 345mm carbon-ceramic rotor to maintain rear brake contribution without upsetting the front-biased stability the GLS chassis requires. The EPB rear caliper preserves the factory electronic parking brake interface instead of forcing a parking-brake delete or separate mechanical workaround.
Front & rear, engineered together: The 390mm front and 345mm rear carbon-ceramic package is engineered as a system so piston area, rotor diameter, pad selection, and rear EPB function are considered together. On the GLS450, GLS550, and GLS63, that matters more than a front-only conversion because the SUV’s brake balance, ABS behavior, and rear stability depend on the rear axle remaining matched to the front upgrade.
Make It Yours — Color & Logo Customization
Every StopFlex kit-upgrade order can be finished with custom caliper colors, a custom caliper logo, and custom rotor hat colors, so the brake package matches your exact build instead of a fixed off-the-shelf look.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
Why StopFlex CCB
Lower Unsprung Mass
StopFlex carbon-ceramic rotors are engineered to reduce rotor mass versus comparable iron discs, helping the suspension react cleaner and the steering feel more precise.
High-Temperature Stability
The carbon-silicon-carbide matrix is built for stable braking behavior at temperatures that can push iron rotors into heavy fade.
Rust-Free Rotor Surface
Carbon ceramic does not form orange flash rust after rain, washing, or storage, keeping the visible rotor face cleaner behind open wheels.
Long Street-Service Potential
In normal road use with matched pads and proper bedding, StopFlex CCB rotors are designed for far longer service life than typical iron replacement rotors.
Low Visible Dust
When paired with matched StopFlex pads, the system produces very low visible brake dust compared with conventional iron rotor and pad combinations.
Premium Ceramic-Glaze Appearance
StopFlex's proprietary coating creates a bright, high-end ceramic-glaze finish with subtle glaze texture and a more premium visual character behind open wheels.
Street-Usable Cold Bite
Street Spec and Track-Day Spec rotors are designed for normal first-stop road use, including cold-weather operation. Motorsport Spec is the competition-focused exception.
Continuous Fiber Reinforcement
Long-fiber carbon ceramic construction improves structural strength and thermal durability versus chopped-fiber approaches.
Heat Management Note
Carbon ceramic rotors tolerate extreme surface temperature, but they do not remove every heat-management requirement. During repeated hard stops, heat can still soak into pads, fluid, seals, calipers, wheels, and nearby components. For long track sessions, mountain descents, or sustained aggressive driving, brake cooling and high-temperature fluid are still recommended.
Street / Track-Day / Motorsport Rotor Options
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.
Package Scope
| Item | Details |
|---|---|
| Front calipers | Genuine OEM AMG 6-Piston Caliper |
| Front CCB rotors | 390mm |
| Rear calipers | Genuine OEM AMG EPB Single-Piston Caliper |
| Rear CCB rotors | 345mm |
| CCB brake pads | Matched for the supplied StopFlex carbon ceramic rotors |
| Rotor hats and floating hardware | Vehicle-specific hardware package |
| Brake lines | Included for complete kit-upgrade orders |
| Color customization | Custom caliper colors, a custom caliper logo, and custom rotor hat colors are available for every kit-upgrade order. |
| 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. |
EPB & Rear Caliper Options
This vehicle leaves the factory with an electronic parking brake (EPB) built into the rear brake, so the rear of the kit is built to keep that EPB working. There are two rear paths. The first is a dual-caliper rear: a main performance caliper handles braking while a dedicated EPB actuator caliper is retained alongside it, so the electronic parking brake, auto-hold, and hill-start assist all keep working; on this path the rear performance caliper can be the TTSPORT EP4 / EP4S 4-piston caliper. The second is an EPB-integrated caliper, a single rear caliper with the electromechanical parking-brake motor built in for a cleaner install with fewer parts behind the wheel; on this path the rear is the TTSPORT EP4 / EP4S 4-piston caliper with integrated EPB. Which path fits best depends on your exact trim and EPB configuration, your budget, your appearance preference, and your wheel size and spoke clearance. Confirm your car's rear-brake configuration with StopFlex before ordering so the correct EPB-compatible rear option is built for your kit.
| Rear option | What it is | Rear caliper | Best when |
|---|---|---|---|
| Dual caliper (EPB retained) | Performance caliper plus a dedicated EPB actuator caliper, both fitted on the rear, so the factory electronic parking brake keeps working. | TTSPORT EP4 / EP4S 4-Piston Caliper | You want guaranteed factory EPB, auto-hold, and hill-start behavior preserved. |
| EPB-integrated caliper | A single rear caliper with the electromechanical parking-brake motor built in, for a cleaner install with fewer parts behind the wheel. | TTSPORT EP4 / EP4S 4-Piston Caliper with integrated EPB | You want a cleaner single-caliper rear with full EPB function. |
FAQ
Will this kit fit my exact 2017-2019 GLS450, GLS550, or GLS63?
Fitment is confirmed per vehicle, not assumed from the X166 chassis code. StopFlex builds the brackets, rotor-hat offsets, and caliper mounting around the confirmed trim, because GLS450, GLS550, and GLS63 configurations can differ in uprights, hub geometry, brake package, and wheel offset.
What wheel size do I need for the 390mm front rotor?
The 390mm front rotor requires 20-inch or larger wheels. Barrel clearance and spoke clearance are both checked because the Genuine OEM AMG 6-Piston Caliper can interfere with some wheel designs even when the wheel diameter is 20 inches or larger.
Will the electronic parking brake still work?
Yes. This kit uses a Genuine OEM AMG EPB Single-Piston Caliper at the rear with the 345mm carbon-ceramic rotor, so the GLS electronic parking brake function is retained when the vehicle is built and configured correctly.
Why choose carbon-ceramic instead of another iron brake setup on this GLS?
Carbon-ceramic rotors reduce brake dust and rotating mass compared with iron rotors, and they maintain friction stability better during repeated high-energy stops. On a heavy GLS X166, the main reasons to choose this kit are heat control, cleaner wheels, lower unsprung mass, and a matched AMG-caliper package built around the exact trim.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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