Why does my Subaru make a noise when I brake?
When a Subaru makes a braking noise, it’s usually a sign of wear or a system issue that should be checked. Common causes include worn pads, warped rotors, or ABS-related activity, and a grinding noise deserves urgent inspection.
This article explains typical brake noises you might hear, how to identify the underlying cause, and what steps to take to stay safe on the road.
Common causes of braking noises in Subaru
Identifying the most frequent culprits helps you know when you can handle a minor maintenance task at home and when professional service is needed.
- Worn brake pads or pads with a wear indicator at or near metal (causes squealing or grinding)
- Glazed pads or rotors due to heat buildup or heavy braking (can create a high-pitched squeal)
- Warped or scored rotors which can cause pulsing, grinding, or thumping noises
- Sticking or seized caliper or loose brake hardware (causes persistent rubbing or uneven braking)
- Parking brake engaged or misadjusted (can cause constant drag and noise)
- Brake dust or debris caught between pad and rotor (often a dull rattle or chatter)
- ABS-related noises (pumping or clicking sounds when the system activates, usually at low speeds)
- Rust on rotors after sitting or damp conditions (may cause a quick squeak that fades as you drive)
Note: A grinding noise, especially when braking hard, almost always warrants an inspection to rule out metal-on-metal contact and compromised stopping power.
Diagnosing and addressing brake noises
This section provides a practical, step-by-step approach to diagnose common braking noises and decide when to replace parts or seek service.
- Check the brake pads for thickness; typical minimums are around 3 mm (about 1/8 inch). If pads are thin, replacement is recommended.
- Inspect the rotors for grooves, scoring, heat discoloration, or warping. Any significant irregularities should be checked by a professional.
- Confirm the parking brake is fully released when driving; a stuck parking brake can cause ongoing noise and drag.
- Wash and inspect for debris between pad and rotor; foreign material can cause intermittent chatter or squeaks.
- Listen for ABS-related noises: a brief cycling sound at low speeds is normal as the system tests; persistent or abnormal sounds may indicate a sensor or reluctor issue.
- Check for caliper sticking: if one caliper is not retracting properly, it can cause uneven braking and noise.
- If you notice a soft or spongy brake pedal, low brake fluid, or warning lights, have the system checked soon as it can indicate a leak or air in lines.
These diagnostic steps help you decide whether you can address it yourself or need a shop visit. If you’re unsure or the noise persists, seek professional evaluation to avoid compromising braking performance.
When to seek professional help
Some noises clearly require a mechanic’s inspection. Contact a technician if you hear grinding, if the brake pedal feel changes, if braking distance seems longer, or if the noise continues after cleaning and inspection.
- Squealing or grinding that persists with light to moderate braking
- Grinding that occurs at all speeds or with no braking input
- Pulsing, pulling, or vibration while braking
- Warning lights on the dash related to the brake system
Professional service can confirm pad/rotor replacement, caliper service, or ABS-related repairs as needed.
Summary
Brake noises in a Subaru most often come from wear or simple issues such as pads, rotors, or calipers, with ABS-related sounds typically normal during activation. Prompt inspection is important if you hear grinding or experience a change in braking feel. Regular maintenance, including pad replacements at the manufacturer’s recommended intervals and ensuring the parking brake is fully released, helps minimize brake noise and maintain safe stopping performance.
