How to adjust the Verna's brake pads grinding against the brake disc?
4 Answers
Verna's brake pads grinding against the brake disc cannot be adjusted and can only be replaced. Automobile brake pads, also known as automobile brake linings, refer to the friction materials fixed on the brake drum or brake disc that rotate with the wheels. The friction linings and friction blocks within them bear external pressure, generating friction to achieve the purpose of vehicle deceleration. The Verna is a compact car under Beijing Hyundai, with dimensions of 4300mm in length, 1705mm in width, and 1460mm in height, and a wheelbase of 2570mm. The car is equipped with a 1.4-liter naturally aspirated engine, delivering a maximum power of 70kW and a maximum torque of 132.4Nm. It features an aluminum alloy cylinder head and block, with a multi-point electronic fuel injection system.
Regarding the issue of Verna's brake pads grinding against the brake discs, I recently helped a neighbor deal with a similar situation. The root cause was poor retraction of the brake caliper and piston sticking. Don't attempt to adjust it yourself; it's recommended to go to a repair shop to have the wheel removed for inspection: First, check if the guide pins lack grease—they need to be thoroughly cleaned and then coated with special brake grease. Second, see if the brake pads are deformed or if the retaining clips have come off. Third, inspect the brake discs for grooves—if they exceed 0.5mm, they need to be resurfaced. Finally, remember never to use ordinary grease; you must use high-temperature-resistant brake-specific lubricant, or else it could easily lead to brake failure.
It's more reliable to leave the brake system to professional mechanics. I once suffered from doing it myself. There are three key points to check: First, test the caliper's retraction by prying the caliper piston with a tire lever to observe the rebound speed. Then, it's essential to sand the chamfer of the brake pads with sandpaper. Finally, during reinstallation, ensure the brake pads can slide easily within the bracket. Here's an important tip: don't rush to drive after installation; pump the brakes several times in place to reset the caliper, otherwise, you'll end up grinding the rotor on the road. For regular maintenance, it's recommended to check the lubrication state of the guide pins every 30,000 kilometers—this is an expense you really shouldn't skimp on.
This issue is usually caused by excessively thick brake pads or deformed caliper brackets. Based on my personal experience, the solution involves three steps: First, remove the brake pads and clean the caliper slots thoroughly with a wire brush to remove all rust. Then, inspect the guide rails of the caliper bracket—replace them if any deformation is found. Finally, during reinstallation, ensure the brake pads do not wobble up and down. A reminder to everyone: After installing new brake pads, remember to go through a break-in period of about 50 kilometers. It's normal to hear slight friction noises initially; they will disappear once the surfaces are properly worn in.
