This study experimentally investigates the influence of brake pad slot geometry on disc–pad interface temperature and braking efficiency under controlled dry braking conditions. While most prior work emphasizes disc design and material composites through simulations, this research
addresses the gap with an experimental test rig capable of quantifying thermal characteristics and stopping performance. Two pad configurations were examined: solid pads with 100% contact area and slotted pads with 90% contact area. Disc surface temperatures were measured at three radial positions (T1: 110 mm, T2: 100 mm, T3: 90 mm) using non-contact thermocouples, while braking duration was evaluated via high-resolution video analysis. Tests were repeated five times across braking pressures of 4–12 bar and simulated speeds of 20–120 km/h, with initial disc temperature stabilized at 18 ± 1 °C. Results show that slotted pads significantly lowered interface temperatures compared to solid pads, with maximum reductions of 25.8% at T1, 22.9% at T2, and 20.9% at T3. Braking time improved by 5% to 20 km/h and 9.52% to 120 km/h using slotted pads. The pronounced temperature gradient at T1 is attributed to higher sliding velocity and centrifugal heat concentration at the outer radius. Uncertainty analysis confirmed error margins of ±2 °C and ±0.1 s. These findings prove the mechanical advantages of slotted pads including enhanced airflow, reduced thermal stress, and improved stopping performance, offering practical insights for perfecting disc brake thermal management and efficiency.