Clunking or knocking sounds from your 2020 Infiniti QX60 brakes suggest loose or worn components allowing movement that should be controlled. Unlike squeaking from friction, clunking indicates impact between parts, requiring identification and repair of the specific loose component.
Brake Hardware Inspection
Brake systems include numerous hardware pieces: anti-rattle clips holding pads, caliper bracket bolts, caliper slide pins, and backing plates. Any loose piece can produce clunking as it moves during braking force changes. Even slight looseness creates noticeable noise.
Caliper Mounting Issues
Caliper bracket bolts can loosen over time, especially if not torqued properly during previous service. Loose mounting allows the entire caliper assembly to shift during braking, producing clunking. This is a safety concern beyond noise—caliper function depends on proper mounting.
Worn Slide Pins and Bushings
Floating calipers move on slide pins that can wear, creating excessive clearance. This looseness allows caliper movement that produces clunking as the caliper shifts under braking forces. Worn pins and bushings should be replaced.
Pad Retention Problems
Brake pads should fit snugly in their brackets without rattling. Missing or damaged anti-rattle clips allow pads to move, creating clunking on application or release. Improper pad installation can also create looseness.
Rotor and Hub Connection
On vehicles with separate rotors and hubs, the rotor should fit securely on the hub. Rust or debris between surfaces can create looseness. Rotor retention screws, when present, prevent movement. Loose rotors clunk when braking forces shift them.
Suspension Component Confusion
Clunking that occurs only during braking may actually originate from suspension components experiencing weight transfer. Worn control arm bushings, ball joints, or sway bar links can clunk under braking forces. Isolating whether noise comes from the wheel or suspension area helps diagnosis.