Brake Noise? Common Causes and Corresponding Parts Replacement Guide

Cause Analysis:

When brake pads wear down to their limit, the wear indicator (metal warning tab) contacts the brake disc, producing a sharp metallic scraping sound. This is the most common cause of brake noise.

Solutions:

• Immediately inspect brake pad thickness. Standard thickness is 10–12 mm; replacement is mandatory when worn to 3 mm or less.
• It is recommended to replace with OEM-equivalent brake pads (e.g., the OE-standard pads supplied by Shandong Ruikeying Auto Parts Co., Ltd.).
• Simultaneously check the brake disc condition; if obvious grooves are present, the disc should also be replaced.

Cause Analysis:

Rust, grooves, or heat-induced deformation on the disc surface can produce a "clunk" or periodic noise during braking.

Solutions:

• Light rust can often be removed through normal braking.
• If grooves exceed 0.5 mm in depth, the disc should be resurfaced (machined) or replaced.
• It is advisable to choose high-quality discs (such as Shandong Ruikeying’s carbon-ceramic composite brake discs).
• After replacement, follow standard procedures for brake system bleeding and bedding‑in (avoid hard braking for the first 300 km).

Cause Analysis:

Insufficient lubrication of caliper guide pins, missing anti‑rattle clips, or loose mounting bolts can produce a "clicking" or "knocking" sound.

Solutions:

• Inspect and retighten all brake system fastening bolts.
• Replace aged anti‑rattle shims and vibration‑damping plates.
• Clean and lubricate caliper guide pins; replace the guide pin kit if necessary.
• Use a dedicated high‑temperature brake grease (e.g., the high‑temperature brake lubricant supplied by Shandong Ruikeying).

Cause Analysis:

Low‑quality brake pads with excessive metal content or uneven hardness often produce a persistent "squeal."

Solutions:

• Replace with OEM‑specification material pads.
• Choose premium pads made of non‑asbestos organic (NAO) or low‑metallic formulations.
• Apply dedicated anti‑squeal paste during installation of new pads.
• Shandong Ruikeying recommends its proprietary quiet‑formula brake pad series.

Cause Analysis:

After driving through water, a water film forms between the pads and disc, producing a temporary "hissing" or "swooshing" sound.

Solutions:

• Light water ingress can often be eliminated by applying the brakes gently several times.
• If noise persists, check whether the pads have absorbed water and swollen.
• If necessary, replace with pads that have a water‑resistant coating (e.g., Shandong Ruikeying’s waterproof brake pads).