There are other nodes that give a sense of uneven, erratic lag, says Alexey Revinexpert “Behind the wheel”.
1. Gearbox
On a car with an automatic transmission, do not touch the brake pedal: if jerks occur during coasting, the problem is in the automatic transmission. The reason may be an insufficient or too high liquid level in the machine. Defects can be hidden in the valve body, torque converter or control electronics.
As for the mechanics, vibration when braking the car can be caused by unstable engine operation. Or is it a faulty throttle position sensor.
2. Brake discs and/or brake drums
Shocks during braking can occur immediately after replacing the discs / drums – and then it’s a poor-quality spare part or improper installation.
3. Defective or worn brake pads
These brake pads have a non-constant coefficient of friction. As a result, the friction lining either works normally, or burns or melts – and then the coefficient of friction drops. The alternation of such processes leads to shocks.
4. Wheel bearing play
If there is a large gap in the bearing on which the wheel rotates, the brake disc (drum) will hang unpredictably in relation to the brake shoes. Driving with a loose bearing is very dangerous.
5. Clamping the brake mechanism
Shocks during braking can also be caused by a drum brake mechanism. The culprits may be a jammed brake cylinder and an out-of-adjustment handbrake actuator.
The car slows down with jerks – this is always the result of failures in systems that affect safety. Read more about other failures in our equipment.