Locked brakes are one of the most problematic technical emergencies that can happen to a lorry driver. This problem can not only result in delays in transport, but also pose a real threat to road safety. Locked brakes in a lorry can be caused by a variety of reasons : from mechanical faults, through problems with the pneumatic system, to operating errors. Regardless of the source of the problem, quick and professional action is necessary to allow the driver to continue driving safely or reach the nearest service point.
From this article, you will learn:
- Brake lock-up in a lorry – causes
- How to release the brakes on a lorry – a step-by-step guide
- Brakes locked up – what should you do? Preventing problems with the truck's braking system
Brake lock-up in a lorry – causes
Before you start unlocking the brakes, you should understand what may have caused them to lock up. The most common causes of this problem are:
- mechanical damage to the brake cylinders,
- pneumatic system failures (leaks, freezing),
- incorrectly adjusted brakes,
- corrosion of brake mechanism components,
- contamination in the pneumatic system.
Stuck brake pads often occur as a result of prolonged vehicle immobilisation, especially in difficult weather conditions. Corrosion can cause the moving parts of the brake system to remain in the braked position. Locked brake pads are also a common result of improper use or neglect of regular technical inspections.
In the case of modern premium trucks such as DAF or SCANIA, it is important to use original parts, truck parts, which guarantee the reliability of the braking systems. Regular inspections by qualified mechanics can significantly reduce the risk of brake problems.
How to release the brakes on a lorry – a step-by-step guide
If you are dealing with locked brakes, follow this procedure:
- Stop the vehicle in a safe place – if possible, find a flat surface away from traffic.
- Check the pneumatic system – make sure the air reservoirs are full and that there is sufficient pressure in the system. If the pressure is too low, start the engine and wait for the system to fill up.
- Locate the problematic brake – Walk round the vehicle and check which wheel or wheels are locked.
- Use the release mechanism – Most brake actuators are fitted with an emergency release mechanism. In this case, SCANIA parts, the mechanism often takes the form of a screw that must be turned in the correct direction.
Please note that some release procedures vary depending on the model and make of the vehicle. DAF truck owners should refer to the owner's manual or consult a technician at an authorised DAF service centre. . Locked brakes on a trailer require special attention, This is because they can cause excessive tyre wear or even damage during towing. In the case of semi-trailers, release valves are often used to enable emergency brake release.
Brakes locked up – what should you do? Preventing problems with the truck's braking system
Prevention is essential to avoid situations where locked brakes could interfere with the driver's work. Here are the most important preventive measures:
- Regular brake system inspections – at least every 30,000 km or as recommended by the manufacturer.
- Proper lubrication of the mechanical components of the braking system.
- Regular drainage of air tanks, especially in winter.
- Checking the pneumatic lines for leaks.
For SCANIA vehicle owners, regular SCANIA service maintenance by specialised mechanics is a guarantee of brake system efficiency. During such inspections, comprehensive diagnostics are performed to detect potential problems before they lead to an emergency vehicle stop. It is also worth remembering that modern lorries are equipped with advanced electronic braking systems (EBS), which may require specialised computer diagnostics. For vehicles with such systems, attempts to unblock the brakes yourself may be ineffective or even harmful. For transport fleets using DAF vehicles, investing in original DAF parts parts is a way to ensure the reliability of braking systems. These components are designed for long-term use in difficult road conditions.
Knowing how to release the brakes on a lorry is not just a technical skill – it is part of every driver’s professionalism. With the right knowledge and regular vehicle servicing, you can significantly reduce the risk of downtime caused by brake system problems, which translates into transport efficiency and safety.