Mercedes-Benz GLA Big Brake Kit Upgrade / TTSPORT Classic 8657
16 Jul 2026
Mercedes-Benz GLA Front and Rear Brake Kit Configuration
| Component | Confirmed specification | Function in this build |
|---|---|---|
| Vehicle | Mercedes-Benz GLA | Front-and-rear street brake upgrade |
| Wheel setup | 19-inch wheels | Wheel package used for this installation |
| Front caliper | TTSPORT TT8657 six-piston caliper | Two-piece forged aluminum front performance caliper |
| Front rotor | 380 × 34 mm high-carbon, heat-treated drilled rotor | Increases front-axle thermal capacity for repeated braking |
| Rear performance caliper | TTSPORT TT6411 four-piston caliper | Matches the front upgrade with a fixed multi-piston rear caliper |
| Rear rotor | 380 × 28 mm high-carbon, heat-treated rotor | Adds rear-axle thermal capacity and visual balance |
| Parking brake | Separate TTSPORT electronic parking brake caliper | Retains a dedicated electronic parking-brake function |
| Rear layout | Dual-caliper setup | TT6411 performance caliper plus a separate EPB caliper |
| Brake lines | TTSPORT braided brake lines | Reduce hydraulic hose expansion under pedal pressure |
| Axle coverage | Front and rear | Creates one coordinated full-vehicle brake package |
Wheel diameter is only the first clearance check. This build used 19-inch wheels, but barrel diameter, spoke profile, wheel offset and caliper-to-spoke clearance must still be measured before ordering.
How the TTSPORT Upgrade Changes the GLA Braking System
| TTSPORT feature | Why it matters on this vehicle | What you notice |
|---|---|---|
| TT8657 six-piston front caliper | The front axle carries most of the braking load as weight transfers forward. Multiple pistons help distribute clamping pressure across the pad face. | More controlled pressure build-up and clearer pedal modulation when the system is correctly sized, bled and bedded. |
| 380 × 34 mm front rotor | The thick high-carbon rotor provides more material to absorb heat during repeated stops. | Less change in braking response as rotor temperature builds during heavy traffic, mountain driving or repeated higher-speed braking. |
| Progressive piston arrangement | Staggered piston sizing helps manage pressure distribution as the rotor enters and leaves the pad contact area. | A smoother transition from light street braking to firmer pedal input, with better control than an abrupt on-off response. |
| TT6411 four-piston rear caliper | A front-and-rear package avoids treating the rear axle as an afterthought and gives the system a more coordinated hardware layout. | A more cohesive front-to-rear response instead of the heavily front-biased feel common to front-only cosmetic upgrades. |
| Separate electronic parking brake caliper | The performance caliper handles service braking while the second rear caliper handles the parking-brake function. | Dedicated parking-brake operation without asking the TT6411 performance caliper to perform two different jobs. |
| Braided brake lines | Braided lines limit hose expansion as hydraulic pressure rises. | A cleaner pressure signal at the pedal, especially during firmer braking inputs. |
| Dust boots and anti-rattle hardware | Street-driven brake systems must deal with water, dust, road debris and low-speed noise—not just high temperatures. | Better protection around the front pistons and more controlled pad movement during everyday driving. |
What Gets Better
- Greater thermal capacity during repeated braking
- More progressive pedal modulation
- Coordinated front-and-rear brake hardware
- Dedicated rear electronic parking-brake function
- Clearer hydraulic feedback from braided brake lines
- Street-focused dust and anti-rattle protection at the front
What to Confirm First
- Exact GLA model year, trim and chassis
- Front and rear hub and knuckle configuration
- Wheel barrel diameter, spoke profile and offset
- Caliper clearance with any spacer included
- Preferred pad balance between bite, dust and noise
- Electronic parking-brake wiring and control requirements
- Local inspection and modification regulations
- Professional installation, bleeding and bedding procedure
If you are unsure whether the 380 mm package clears your wheels, send the exact vehicle and wheel specifications through our fitment request before ordering.
Mercedes-Benz GLA Build Gallery
Mercedes-Benz GLA Brake Kit FAQ
Does this TTSPORT brake kit fit every Mercedes-Benz GLA?
No. GLA fitment can vary by model year, trim, chassis, hub and knuckle configuration. Confirm the exact vehicle and wheel specifications before ordering.
Will any 19-inch wheel clear the 380 mm brake kit?
No. This case used 19-inch wheels, but diameter alone does not confirm clearance. Barrel diameter, spoke profile, offset and caliper-to-spoke space must be checked.
How is the electronic parking brake retained at the rear?
The rear uses a dual-caliper layout: a TT6411 four-piston performance caliper plus a separate TTSPORT electronic parking brake caliper.
Is a six-piston front and four-piston rear setup suitable for daily driving?
It can be when piston sizing, pad compound, hydraulic balance and installation are matched correctly. This build also uses front dust boots and anti-rattle hardware for street use.
What should be checked after the brake kit is installed?
Verify all fastener torques, hose routing, fluid bleeding, pedal feel and parking-brake operation, then complete the specified pad-and-rotor bedding procedure and recheck the system.
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.