After replacement, repair or maintenance of the Car Brake Caliper, brake pads, rotors, pistons and sliding mechanisms need renewed fitting contact. This 300‑500‑kilometer running‑in phase is essential for stable braking‑system performance. Improper running‑in may lead to permanent defects such as soft brake response, brake pull‑to‑side, uneven pad wear, rotor grooving and caliper jamming, which seriously endanger driving safety. Driving norms and inspection requirements must be strictly followed throughout this period.
Above all, hard braking and aggressive stops are prohibited. Within the running‑in period, pistons are not operating smoothly and contact surfaces between pads and rotors remain uneven. Frequent high‑speed hard stops create instant local overheating, burning and carbonizing brake pads. Pistons bear excessive instantaneous pressure, resulting in piston offset and sliding‑mechanism jamming. Consequently, abnormal noise, uneven braking force and over‑tight single‑side braking will emerge. Anticipate traffic changes while driving and decelerate by gentle intermittent braking to achieve uniform contact of friction surfaces.
Strictly control vehicle speed and operating conditions. Keep speed under 80 km/h during running‑in. Urban cruising is preferred; highways and expressways should be bypassed as much as possible. Uneven fitting will amplify braking deviation and accelerate component wear under high‑speed conditions. Heavy‑loaded driving is forbidden, because excessive vehicle weight increases caliper working loads and impairs fitting precision. Steer clear of mountain roads, steep slopes and congested sections with sustained partial brake application. Continuous high temperatures generated by partial braking will ruin the running‑in effect.
Follow standardized braking operations and maintain brake flexibility. Never keep brakes fully depressed for long or coast with brakes dragging. Such behaviors keep pistons persistently compressed and prevent normal return, producing continuous high‑temperature abrasion and glazed friction surfaces. When waiting at traffic lights, manual‑transmission vehicles should shift to neutral and activate hand brakes; automatic‑transmission vehicles should engage P gear instead of keeping foot brakes applied. Accelerate and brake softly and linearly to let sliding assemblies adapt gradually and guarantee smooth piston extension‑retraction and caliper sliding.
Monitor braking status all the time and troubleshoot anomalies promptly. Normal performance features linear response, consistent force and no lag or sticking. If brake pull‑to‑side, over‑tight single‑side braking, unusual noise, pedal vibration or poor return occurs, stop driving immediately and inspect for incorrect installation, stuck guide pins or trapped air in hydraulic circuits. Do not continue driving with defects. After completing running‑in, perform two to three moderate‑speed gentle stops to clear surface dust on friction surfaces. Regular driving is then permitted. Standard running‑in procedures help the braking system reach optimal working conditions.
