What Causes Tire Deviation When Braking?

[MacBarrett]

The reasons for tire deviation when braking: 1. Different brands or specifications of brake pads (disc brakes) or brake shoes (drum brakes) on both sides result in varying friction effects, leading to uneven braking performance. Alternatively, brake caliper leakage may cause oil contamination on one side's brake pads, reducing braking effectiveness; 2. Inconsistent friction coefficients between the two brake discs or drums, such as one side being smooth and the other rough, causing uneven braking; 3. Brake caliper leakage or leaks in brake pipes/joints will create uneven braking performance; 5. Excessive wear gap in the brake caliper causes inconsistent compensation gaps in both calipers during braking, resulting in deviation.

[Brayden]

A few days ago I encountered a similar issue where the steering wheel kept pulling to the right when braking. This kind of deviation is mostly caused by uneven braking force on the left and right sides. I inspected the braking systems of all four wheels and found that the brake caliper piston on the left front wheel was rusted and stuck, preventing the brake pads from fully retracting. Additionally, uneven wear on the brake discs can cause this; if the inner side is severely worn, the contact surface of the brake pads becomes uneven. Another easily overlooked reason is significant differences in tire wear between the two sides or inconsistent tire pressure. I recommend checking the braking system immediately, especially the flexibility of the calipers and the thickness of the discs and pads. Deformation of suspension tie rods could also have a secondary effect. This situation is particularly dangerous when driving at high speeds, so don't wait until you can't stop to address it.

[LeNolan]

I often encounter this type of complaint during car repairs. Focus on three key aspects: First, if the wear difference between the left and right brake pads exceeds 2mm, it will cause noticeable pulling, especially dangerous in rainy weather; second, a blocked or leaking brake hose on one side; third, aging of the steering knuckle arm bushings. Last year, an old Passat owner complained that the car always pulled to the left when braking. Upon disassembly, we found the right wheel guide pin grease had dried up, preventing the brake pad from moving properly. This type of fault requires professional equipment to measure brake force distribution values—it's difficult to fix with DIY adjustments. Remember, the direction of pulling is usually opposite to the wheel with weaker braking force.

[VanIsaac]

Veteran drivers remind you: Worn steering systems are hidden culprits. My off-road vehicle once veered during braking on bumpy roads, which was actually caused by cracked lower arm bushings leading to misalignment. Additionally, leakage in a single shock absorber can affect the vehicle's balance, causing uneven front-end sinking during braking and directly resulting in veering. It's recommended to check the toe angle in the wheel alignment parameters; deviations exceeding 0.5 degrees require adjustment. For vehicles with electronic power steering, pay extra attention to torque sensor calibration, as significant errors can exacerbate the sensation of veering.