• Wear indicator on vehicle dashboard. Modern vehicles, including the Chevrolet Impala, are equipped with electronic sensors in their brake pads. When the friction material wears down to approximately 2 mm from the pad backing plate, replacement becomes necessary. These sensors trigger a warning symbol in your vehicle's instrument cluster, alerting you to the need for brake pad replacement. Your owner's manual provides details about this specific warning symbol.
• High pitched squeal when braking. As the brake pad's friction material approaches the backing plate, you might notice a persistent squealing or squeaking sound while driving, regardless of brake application. This noise serves as an intentional warning system, indicating that your brake pads require inspection. If you hear grinding or scraping sounds during braking, this means the friction material has completely worn away. At this stage, immediate pad replacement is crucial, and continuing to drive the vehicle would be unsafe.
• Brake pedal pulsation or vehicle vibration on Chevrolet Impala. Brake rotors can develop issues over time, including excessive thickness variation (exceeding .001 inches), significant runout on the wheel hub (beyond .002 inches), or warping due to extreme temperatures. These conditions often manifest as pulsations in the brake pedal or steering wheel during braking. When such defects are present, you'll need new pads along with either rotor resurfacing or complete replacement.
• Vehicle pulling or wandering on braking. If your vehicle, such as a Chevrolet Impala, pulls to either side during braking, several factors could be responsible. These include a sticking brake caliper, suspension misalignment, tire defects, or uneven tire pressure between sides. A professional inspection will determine whether brake pad replacement alone will solve the issue or if additional repairs are necessary.
• High mileage on existing pads for Chevrolet Impala. Even without obvious brake system symptoms, it's essential to have a professional mechanic measure the brake pad friction material thickness and conduct a comprehensive brake system inspection every 10,000 miles.
• Brake system warning lights and/or maintenance reminder messages. Any illumination of the brake system warning light or appearance of brake-related maintenance messages in your driver information display should prompt immediate professional inspection and necessary repairs.How do mechanics replace brake pads?
Normally, pad replacement requires these steps:
• Confirm the thickness of the remaining friction material on the brake pads. If the remaining friction material is less than 2 mm in thickness, pad replacement is warranted.
• Visually inspect the brake rotor surface that contacts the pad (for scoring, pitting, grooves, rust) and measure the brake rotor with precision tools for thickness variation, run-out, and warpage.
• Thoroughly examine the caliper, torque plate, brake pads, and rotors to verify proper caliper movement and operation (specifically checking for any signs of seized or stuck calipers).
• Upon customer authorization, proceed with installing new brake pads and any additional components deemed necessary (such as rotors that no longer meet manufacturer specifications, which is particularly important for vehicles like the Chevrolet Impala).
• Apply appropriate lubrication to brake system components, especially the caliper sliding pins, and evaluate the brake fluid condition and level. Replenish brake fluid to the proper level as needed.
• Complete a comprehensive 50-point safety inspection of your vehicle to ensure all systems are functioning correctly.
• The final step involves the mechanic conducting a thorough test drive to verify the brake system is operating normally and safely.
Is it safe to drive with a brake pad problem?
Operating a vehicle with any known brake system deficiency poses significant safety risks and should be avoided. Worn brake pads significantly increase stopping distances, potentially compromising your safety. Therefore, prompt replacement of worn brake pads is essential. Continuing to drive is strongly discouraged if you experience any of these conditions: noticeably increased stopping distances; a soft or low brake pedal; reduced braking power assistance; severe pulling to one side during braking; or an illuminated brake system warning light.
If you notice unusual sounds like squealing or grinding, but your vehicle maintains normal stopping distances with a firm brake pedal and no warning lights, you may safely reach your destination. However, schedule service as soon as possible. When it comes to your Chevrolet Impala's braking system, always prioritize safety and have a professional mechanic inspect the brake pads and system at the first sign of trouble.
When replacing brake pads keep in mind:
Brake pad replacement must always be performed as a complete set – meaning both wheels (driver and passenger side) on the same axle, whether front or rear, require service simultaneously. Replacing pads on just one side could result in uneven braking, causing your vehicle to pull to one side during brake application. Additionally, brake rotor resurfacing or replacement is often necessary. A qualified mechanic will always assess rotor wear and damage through precise measurements, advising whether resurfacing or complete replacement is required.