Complete Guide to Brake Pad Maintenance: Do These Right to Extend Lifespan and Enhance Safety
Brake pads are "consumables" in a car's braking system. Even if you choose high-quality products, improper daily maintenance can lead to premature failure and potential safety hazards. Many car owners only focus on "when to replace" them but overlook daily maintenance details. In fact, scientific maintenance not only extends the lifespan of brake pads but also ensures the braking system remains in optimal condition at all times. Below is a summary of practical brake pad maintenance knowledge from three dimensions: daily inspection, usage habits, and replacement key points.
I. Daily Inspection: Master "Looking, Listening, Feeling" to Detect Hidden Risks in Advance
Brake pad wear is gradual. Regular inspections can avoid the passive situation of "replacing only after being worn through". It is recommended to inspect at least once a month, and a must-check before long-distance trips.
"Looking" at Thickness: Intuitively Judge Wear Level
After parking and turning off the engine, you can observe the thickness of the brake pads through the gap in the wheel hub (some models require tire removal). A brand-new brake pad is approximately 10-12mm thick. When worn down to 3-4mm (close to the thickness of a coin edge), it is necessary to arrange for replacement in a timely manner; if the metal backing plate behind the brake pad is exposed, it indicates that the wear has reached the limit, and you must stop using the vehicle immediately for replacement. Continuing to drive at this point may scratch the brake disc, resulting in higher maintenance costs.
"Listening" to Sounds: Capture Early Warning Signals
Most brake pads are equipped with a "wear warning device"-when the thickness is less than 3mm, the warning plate will rub against the brake disc, emitting a continuous "squeaking" metal noise (not the "clunking" sound of loose brake calipers). This is the brake pad "reminding" you to replace it, and maintenance must be completed within 1,000 kilometers; if you hear a "sharp scraping sound", it may mean the friction material has completely fallen off, and the metal backing plate is in direct contact with the brake disc. At this time, the braking effect is significantly reduced, and emergency maintenance is required.
"Feeling" the Condition: Perceive Abnormal Wear
After the vehicle cools down, you can gently touch the surface of the brake disc (be careful to avoid burns). If the touch is rough with obvious grooves or scratches, it may be that impurities (such as small stones) have mixed into the brake pads. In the long run, this will accelerate the wear of both parts, so you need to go to a maintenance shop to clean the impurities and check if the brake pads are deformed; at the same time, observe the inner side of the wheel hub. If there is an abnormally large amount of black dust (far exceeding the normal wear amount), it may be that the brake pad material is unqualified or the braking system is stuck, requiring further investigation.
II. Usage Habits: Avoid 3 "Wear Killers" to Extend Brake Pad Lifespan
Bad driving habits are the main cause of premature brake pad failure. Adjusting habits can extend the lifespan of brake pads by 20%-30%.
Reject "Sudden Hard Braking", Use "Predictive Braking" More
Frequent sudden braking causes the temperature of the brake pads to rise sharply, accelerating the carbonization of the friction material and shortening its lifespan. During daily driving, when you see traffic lights or the vehicle in front decelerating, release the accelerator in advance and gently step on the brake to slow down slowly, allowing the brake pads to bear force evenly; when driving at high speed, maintain a safe distance from the vehicle in front, avoid frequent "spot braking", and reduce the impact wear of the brake pads.
Avoid "Driving with Brakes Applied", Reduce Continuous Friction
Some car owners are used to "keeping their feet on the brake" when going downhill or stepping on the brake for a long time while waiting for a stop, which keeps the brake pads in a state of continuous friction and the temperature remains high. The correct approach is: when going downhill, use low gears (manual transmission in 2-3 gears, automatic transmission in L gear) for auxiliary braking, using engine resistance to slow down and reduce the burden on the brake pads; after parking, shift to P gear (for automatic transmission) or pull the handbrake (for manual transmission), and release the foot brake to avoid "idle consumption" of the brake pads.
Regularly Clean Dust to Prevent Jamming and Failure
Brake pad wear generates dust. If it accumulates between the brake pads and the brake disc for a long time, it will affect the friction effect and even cause braking jamming. It is recommended to rinse the inner side of the wheel hub with a high-pressure water gun (adjusted to low-pressure mode) every 3 months to wash away the dust; if the dust has caked, you can use a soft brush with soapy water to clean it, avoiding scraping with hard objects to prevent damage to the brake pad surface.
III. Replacement and Running-In: Handle Details Well to Avoid "New Pad Failure"
Replacing brake pads is not just "installing new ones and being done with it". The correct replacement process and running-in steps directly affect the braking effect.
Replacement Principle: "Symmetrical Replacement + Supporting Inspection"
Brake pads must be replaced simultaneously on the left and right wheels. Even if one side is more severely worn, you cannot replace only one side-uneven braking force on both sides will cause the vehicle to deviate during braking, and it is extremely easy to lose control at high speeds. During replacement, it is recommended to check the brake disc, brake fluid, and brake calipers at the same time: if the wear depth of the brake disc exceeds 1.5mm (measurable with a special tool) or there are severe scratches on the surface, the brake disc needs to be replaced simultaneously; if the brake fluid has been used for more than 2 years or the liquid level is below the standard line, it must be replaced in a timely manner to avoid affecting the transmission of braking pressure due to fluid deterioration.
New Pad Running-In: "Soft Braking" for 200 Kilometers, Avoid Sudden Braking
After installing new brake pads, the friction surface and the brake disc are not fully fitted. Running-in is required for the first 200 kilometers: avoid sudden braking, and control the braking force at 60%-70% of normal braking to allow the brake pads and brake disc to gradually adapt. During the running-in period, the braking distance may be slightly longer, so you need to predict road conditions in advance; after 200 kilometers, you can use the brake pads normally, and the braking effect will gradually reach the optimal state.
After-Sales Warranty: Keep Certificates and Pay Attention to Abnormalities
When purchasing brake pads, keep the purchase certificate and warranty card (most brands provide a 1-3 year warranty). If the new pads have continuous abnormal noise, weak braking, or excessive wear (such as more than 5mm wear in 10,000 kilometers) after use, you can contact the brand's after-sales service for inspection with the certificate to check if there is a product quality problem. Avoid disassembling by yourself, as this may invalidate the warranty.
The core of brake pad maintenance is "preventing problems before they occur"-detecting hidden risks in a timely manner through daily inspections, reducing wear with scientific habits, and replacing and running-in in accordance with standardized procedures. These seemingly simple details can directly affect driving safety and vehicle usage costs. If you are unsure about the condition of the brake pads or cannot judge abnormalities, it is recommended to go to a professional maintenance shop for inspection in a timely manner. After all, every smooth braking relies on careful maintenance of the brake pads.
