What Causes the Rear Wheels to Lock Up?

1 Answers
DelJulianna
07/29/25 1:02pm
The reasons for the rear wheels locking up are water ingress into the brake drum and hard emergency braking. Here are the detailed explanations: Water ingress into the brake drum: If the vehicle has been parked for too long, moisture was not promptly removed after driving in the rain, or the brake drum was not treated after getting wet during car washing, rust can form on the brake drum, eliminating the gap between the drum and the brake shoes, leading to excessive force during braking, which may cause the wheels to lock up. Hard emergency braking: During emergency braking, if the brake pedal is pressed too hard, the brake shoes can lock the wheels, meaning the brake locks the tires. If the rear axle locks up, it may result in rear-wheel skidding.
Was this review help?
12
4
Share
More Forum Discussions

What Causes the Malfunction of Audi's Low Beam and High Beam?

Left light grounding is loose, causing an open circuit; it could also be an issue with the lighting control module; or a problem with the combination switch, or communication failure between the two. Below are specific explanations: 1. All lights are on: indicates a malfunction in the dimmer switch. 2. If the high beam is on but the low beam is off when connected: the fault lies between the dimmer switch and the headlight or between the dimmer switch and the low beam. 3. If the high beam of the headlight does not turn on: check if the high beam indicator is on. If it is, the fault is between the terminal block and the headlight; if not, the fault is between the terminal block and the dimmer switch. 4. If only one headlight is on and the other is off: it may be due to a burnt-out filament, an open circuit in the wiring, or poor grounding (dim headlight).
6
5
Share

What are the reasons why the driver's door of the Audi Q5 cannot be opened from the outside?

The door cannot be opened due to a malfunction of the internal components of the car door. If the car door components are faulty, it is necessary to promptly go to the car's 4S store or a repair shop to inspect the door or replace the components. The following are the precautions for use when getting out of the car: 1. Observe whether there are vehicles approaching from behind: Before opening the door, observe the left rearview mirror to confirm whether there are vehicles approaching from behind. For passengers on the left side of the rear seat, the driver should be asked to help observe the situation behind before opening the door to confirm safety. 2. Do not push the door open all at once: Open the door slightly to confirm from the external rearview mirror that there are no vehicles coming from behind before fully opening the door. Do not push the door open all at once, but first open it slightly. This allows drivers of motorcycles and non-motor vehicles approaching from behind to know in advance that the door is about to open, so they can avoid it.
15
2
Share

What does the tire high pressure warning mean?

Tire pressure display belongs to active tire pressure monitoring, which can directly show the current tire pressure, while tire pressure warning belongs to passive tire pressure monitoring. The following are detailed introductions: 1. Direct tire pressure monitoring: A gas pressure sensor is installed inside the tire, and a wireless transmitter is used to send the signal to the central receiving module. After processing, the specific value is displayed on the instrument. When the pressure is insufficient or there is a difference, the monitoring warning light will turn on. 2. Indirect tire pressure monitoring: The wheel speed difference is used to determine tire leakage. When a tire leaks, the weight of the vehicle will reduce the rolling radius of that wheel, causing its speed to be faster than other wheels. By comparing the speed difference between tires, it can determine whether the tire is under-inflated, and the tire pressure monitoring warning light will turn on.
7
1
Share

What are the gears of the BMW X3 automatic transmission?

BMW X3 automatic transmission gear introduction is as follows: 1. P (Parking gear): This gear is usually located at the top of the gear lever. It should be engaged when parking for a long time. If the parking gear is not engaged when the engine is turned off, it should be engaged before starting the vehicle next time. 2. R (Reverse gear): This gear can only be engaged when the car is completely stopped. 3. N (Neutral gear): The hydraulic torque converter is in an idling state, and power cannot be transmitted to the planetary gear. The neutral gear is used for short-term parking. 4. D (Drive gear): The automatic transmission works automatically during driving, and the driver only needs to control acceleration and deceleration. 5. S (Sport gear): In sport mode, the transmission can shift freely. During driving, the gear lever can be directly pushed into the S gear, which is usually used for climbing and overtaking.
12
2
Share

Is the car safe as long as it doesn't stall in water?

It is not necessarily true that the car is undamaged as long as the engine doesn't stall. Driving through water can lead to water entering the transmission and may cause damage to the vehicle's electronic systems. Here is some relevant information: 1. Inspection is necessary: Generally, if the car doesn't stall while driving through water, it should be fine. However, it's best to inspect the vehicle, especially if the water level has risen above half of the tire. This could potentially endanger the entire vehicle's electrical system and the onboard computer, so an inspection is recommended. After exiting the water, apply the brakes gently to dry the brake pads by friction. 2. Engine stalling: Driving through water may cause the engine to stall. This happens when water enters the intake system, suddenly cutting off the air supply needed for combustion, leading to an immediate stall. In any case, it is strictly forbidden to restart the engine directly. The first step should be to check whether water has entered the engine's intake system.
3
5
Share

Does the green book indicate that the vehicle is for non-operational use?

The green book may indicate that the vehicle is for non-operational use. Here are the relevant details: 1. Operational vehicles: These are vehicles used for transporting goods or passengers for profit, such as taxis or privately-owned cargo trucks. Before such vehicles can be used on the road, in addition to requiring a driver's license and vehicle registration, they must also obtain an operational permit and a professional driver's qualification certificate from the transportation management department, along with paying relevant fees. 2. Non-operational vehicles: These refer to cars or trucks owned by individuals or organizations that are not used for profit-making activities like taxi services or transporting goods for hire. Instead, they are for general internal use. In this case, privately-owned small cars do not need an operational permit or professional driver's qualification certificate. However, privately-owned trucks still require these documents. When it is unclear whether the vehicle is for 'personal use' or 'operational purposes,' operational fees must be paid.
6
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.