Hongqi E-HS9 Big Brake Kit Upgrade / TTSPORT Classic 8703S

The Hongqi E-HS9 is FAW's flagship electric SUV, and heavy EV platforms ask a lot of factory brake hardware — more curb weight means more kinetic energy the brakes have to soak up every time the driver gets on the pedal. This case study covers an OEM+ upgrade on an E-HS9 to the TTSPORT TT8703S big brake kit, a bolt-on kit built around the vehicle's factory wheel and suspension package.

The owner's complaint was familiar for a two-ton-plus EV SUV: a soft, long pedal under hard braking and noticeably longer stops once the factory pads and rotors got hot. The TT8703S kit swaps in a bigger caliper and rotor package sized for the E-HS9's extra mass, without touching the hub or suspension geometry.

Vehicle & Kit Specs

Why It Works

• A forged, fixed-caliper design flexes less than a stock floating caliper under hard braking, so less of the driver's pedal travel gets absorbed by caliper flex and more of it goes straight into clamping force.
• A larger, heavier rotor has more mass to absorb heat before temperatures climb high enough to cause fade — important on a heavy SUV where repeated hard stops generate more thermal load than on a lighter car.
• Because the kit is engineered around the E-HS9's factory hub and wheel package, the goal is a bolt-on fit that clears the OEM wheels without spacers or other workarounds.

Fitment & Installation

The TT8703S kit is set up as an OEM+ upgrade for the E-HS9 — it's meant to bolt into the factory brake mounting points rather than require suspension or hub modifications. As with any big brake kit, it's worth confirming wheel clearance and caliper bracket fitment for your specific trim and wheel spec before ordering.

Installation Gallery