2023-2026+ Mercedes-Benz GLC-Class / AMG (X254/C254) 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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2023-2026+ Mercedes-Benz GLC300 / GLC43 / GLC63 S (X254/C254) CCB Big Brake Kit — Genuine OEM AMG 6-Piston Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
This StopFlex kit is for X254/C254 GLC owners who want more heat capacity than the factory iron setup, less brake dust on open AMG-style wheels, and a lighter carbon-ceramic rotating package without losing the rear electronic parking brake. The front axle uses a Genuine OEM AMG 6-Piston Caliper with a 390mm carbon-ceramic rotor, while the rear uses a TTSPORT EP4 4-Piston Caliper with EPB on a 380mm carbon-ceramic rotor. Because GLC300, GLC43, and GLC63 S variants can differ in knuckle, hub, and wheel-clearance details, every StopFlex kit is engineered against the buyer’s confirmed trim rather than assumed from the X254/C254 chassis name.
- 390mm is the largest rotor in this GLC kit, so 20-inch wheels are the minimum; wheel-spoke clearance still must be checked before build approval.
- The front upgrade uses the exact Genuine OEM AMG 6-Piston Caliper paired with a 390mm StopFlex carbon-ceramic rotor for front-axle heat capacity and pedal consistency.
- The rear axle keeps electronic parking-brake function with a TTSPORT EP4 4-Piston Caliper with EPB and a 380mm carbon-ceramic rotor, so the kit is engineered as a full front/rear system.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz GLC300 / GLC43 / GLC63 S (X254/C254) |
| Model years | 2023-2026+ |
| Front setup | Genuine OEM AMG 6-Piston Caliper / 390mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| 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 axle uses the Genuine OEM AMG 6-Piston Caliper, giving the 390mm carbon-ceramic rotor a rigid multi-piston clamp layout for stable pressure distribution and a firmer high-temperature pedal. Its OEM AMG provenance matters on the X254/C254 GLC because the caliper architecture is based on a production performance application rather than an anonymous universal casting. StopFlex matches the caliper mounting, bracket geometry, and rotor-hat offset to the customer’s confirmed GLC300, GLC43, or GLC63 S configuration.
Rear Caliper (Balance)
The rear axle uses the TTSPORT EP4 4-Piston Caliper with EPB to add rear thermal capacity and keep the car stable when the front 390mm brake package is working hard. Its EPB actuator preserves the factory electronic parking-brake function instead of forcing a mechanical parking-brake delete.
Front & rear, engineered together: This kit is engineered as a matched 390mm front / 380mm rear carbon-ceramic system so rear brake contribution, EPB function, and front-biased stopping authority are developed together. The TTSPORT EP4 shares the EP4/EP4S rear-axle architecture: 4 hydraulic service pistons plus 1 dedicated EPB actuator piston, with the EP4 chosen where rear rotor sizing and wheel/spoke clearance call for the more compact package.
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 | TTSPORT EP4 4-Piston Caliper with EPB |
| Rear CCB rotors | 380mm |
| 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. |
TTSPORT EP4S rear caliper specification (the EP4 shares the same engineering, slightly more compact):
| Specification | EP4S |
|---|---|
| Axle position | Rear |
| Piston count | 4 hydraulic + 1 EPB actuator |
| Piston type | Two-piece heat-insulated, dust boots + EPB actuator |
| Piston diameter | 28 mm × 4 / 27 mm × 1 |
| Total piston area | 30.4 cm² per caliper |
| Manufacturing process | Two-piece forged aluminum body |
| Net weight | 4.50 kg per caliper (no pads) |
| Surface finish | High-temperature gloss coating |
| Recommended wheel size | 18 in or larger |
FAQ
Will this kit fit my exact GLC300, GLC43, or GLC63 S?
StopFlex does not treat X254/C254 as one universal fitment. Before production, we confirm your year, trim, body style, wheel size, offset, spoke profile, and brake-hub measurements so the brackets, rotor hats, and caliper mounting match your exact GLC.
What wheel size is required for the 390mm front rotor?
This kit requires 20-inch or larger wheels because the front rotor is 390mm. Diameter alone is not enough; the Genuine OEM AMG 6-Piston Caliper also needs spoke-clearance confirmation before the kit is released for build.
Will the electronic parking brake still work?
Yes. The rear TTSPORT EP4 4-Piston Caliper with EPB uses hydraulic service pistons for braking and a dedicated EPB actuator piston for parking-brake operation, so the GLC retains factory EPB convenience when the kit is configured correctly.
Why choose carbon-ceramic instead of replacing the factory iron brakes?
On a heavy X254/C254 GLC, carbon-ceramic rotors reduce brake dust, cut rotating mass compared with comparable iron hardware, and tolerate repeated heat cycles better during fast street driving or track use. This kit also gives the front axle a 390mm rotor and AMG 6-piston clamp package instead of simply refreshing the original brake hardware.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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