Technical Articles
Brake Literature
BRAKE Squeal
Brake squeal troubleshooting guide
| Failure appearance period | Type of noise | Probable cause | Solutions |
|---|---|---|---|
| Immediately after replacement | Squeal | Pad and disc bedded-in, or insufficient anti-noise measures | Drive continuously. No effect then, pad chamfering process, attach squeal hold shim, apply grease (especially at caliper pad retainer area). |
| installation failure. | Confirm correct installation. Especially for Japanese domestic vehicle, confirm if OEM metal shim installed, if not conduct installation |
||
| Immediately used pad friction material adhered on disc surface, or stepped (case of used disc) | Shave disc or replace disc | ||
| Growl | Immediately used pad friction material adhered on disc surface, or stepped (case of used disc) | Shave disc or replace disc | |
| Period elapsed from pad replacement | Squeal | Measures for squeal effect lowered or deteriorated | Re-application of pad grease, replacement of squeal hold shim, re-chamfer of pad and replacement of relative parts again |
| Pad deterioration or friction material adhered on disc surface | If surface lightly deteriorated scrub with sand paper Passed usable limit or one side worn, replace with new part Disc shaving or disc replacement |
||
| Disc surface with friction material adhere or friction material surface change | Shaving or sand paper scrub on pad or disc | ||
| Grating | Slide pin stick | Slide pin inspection and lubrication | |
| Regardless of pad replacement period | Squeal | Caliper piston deterioration | Replacement of dust seal and piston seal (especially running distance as 70,000km, 5 years after new car registration need caution) |
| Grating | Disc surface with friction material adhere, or friction material surface change | Scrubbing by sand paper or shaving on pad or disc | |
| Rattle, snap | Along with widen gap between pad and torque member, pad move at braking and hit torque holding area (reverse run from complete stop) | Replace squeal prevent metal or spring holding pad to leading side |
※This troubleshooting guide being edited on the assumption only for street and highway, or mountain road at normal speed.
Circuit run, or similar to such running conditions (repeated braking at high speed as in high way) in such case, initially as failure appearance period may not meet this guide which please note before hand.