General Diagnostic Table: Inspection
WARNING: This page is about a different car, the 2023 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
| Symptoms | Possible cause | Corrective action |
|---|---|---|
| Insufficient braking | Fluid leakage from the hydraulic mechanism | Repair or replace. (Cup, piston seal, piston boot, master cylinder, brake pipe or brake hose) |
| Entry of air into the hydraulic mechanism | Bleed air. | |
| Wear, deteriorated surface material, water or fluid on pad | Replace, grind or clean. | |
| Improper operation of master cylinder assembly, brake caliper, electric booster assembly or check valve | Repair or replace. | |
| Unstable or uneven braking | Fluid on pad surface or brake disc | Correct the cause of fluid leakage, and clean or replace. |
| Defective brake disc | Repair or replace the brake disc. | |
| Improper pad contact, deteriorated surface, deteriorated or worn pad material | Repair by grinding, or replace. | |
| Deformed brake back plate | Repair or replace. | |
| Overinflation of tires | Adjust to the specified air pressure. | |
| Defective wheel alignment | Adjust alignment. | |
| Loose brake back plate or support installation bolt | Tighten to the specified torque. | |
| Defective hub unit bearing | Replace. | |
| Defective hydraulic system | Replace the cylinder, brake pipe or brake hose. | |
| Unstable performance of the parking brake | Check, adjust or replace the rear brake. | |
| Excessive pedal stroke | Entry of air into the hydraulic mechanism | Bleed air. |
| Excessive play in the master cylinder push rod | Adjust. | |
| Fluid leakage from the hydraulic mechanism | Repair or replace. (Cup, piston seal, piston boot, master cylinder, brake pipe or brake hose) | |
| Improper pad contact or worn pad | Repair or replace. | |
| Brake dragging or improper brake return | Insufficient pedal play | Adjust play. |
| Improper master cylinder return | Clean or replace the cylinder. | |
| Clogged hydraulic system | Replace. | |
| Improper return of parking brake | Repair or adjust. | |
| Improper brake caliper operation | Repair or replace. | |
| Defective hub unit bearing | Replace. | |
| Brake noise (creaking sound) | Hardened or deteriorated brake pad | Replace the brake pad. |
| Worn brake pad | Replace the brake pad. | |
| Loose brake back plate or support installation bolt | Tighten to the specified torque. | |
| Loose hub unit bearing | Tighten to the specified torque. | |
| Dirt on brake disc | Clean the brake disc. Clean or replace brake assembly. |
|
| Brake noise (hissing sound) | Worn brake pad | Replace the brake pad. |
| Improperly installed brake pad | Correct or replace the brake pad. | |
| Loose or bent brake disc | Retighten or replace. | |
| Brake noise (click sound) | Excessively worn brake pad or support | Replace the brake pad or the support. |
| VDC warning light or EyeSight warning light illuminating | Stop light switch adjustment malfunction | Adjust the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH>ADJUSTMENT>ADJUSTMENT WHEN VDC WARNING LIGHT OR EYESIGHT WARNING LIGHT IS ILLUMINATING . |
| VDC system failure | Check the VDC system. Ref. to BRAKE CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE . | |
| EyeSight system failure | Check the EyeSight system. Ref. to EYESIGHT (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE . | |
| Stop light illuminating due to vibrations, etc. during driving (brake operation not performed) | Stop light switch adjustment malfunction | Adjust the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH>ADJUSTMENT>ADJUSTMENT WHEN VDC WARNING LIGHT OR EYESIGHT WARNING LIGHT IS ILLUMINATING . |