Volvo A35 Brake Issues: Troubleshooting and Solutions for Improved Performance

[MikePhua]

Volvo's A35 articulated dump trucks are known for their robust performance and durability in heavy-duty applications, particularly in construction, mining, and large-scale earthmoving operations. However, like any heavy equipment, they are not immune to mechanical issues. One of the common problems reported by operators is brake issues, which can significantly affect the truck's performance and safety.
In this article, we will delve into the most common brake issues on the Volvo A35, how to troubleshoot them, and some insights into how to keep these powerful machines running at their best.
Understanding the Brake System on the Volvo A35
The Volvo A35 is equipped with an advanced hydraulic braking system designed to handle the demands of large loads on rough terrain. The brake system typically consists of disc brakes, calipers, and hydraulic lines that work together to provide reliable stopping power. Over time, however, wear and tear can take a toll on any component, and the braking system is no exception. Issues like air in the lines, worn-out components, or fluid leakage can cause the brakes to perform poorly, leading to safety concerns on the job site.
Common Brake Problems on the Volvo A35

1. Loss of Brake Pressure
   One of the most frequent complaints regarding the Volvo A35’s braking system is the loss of brake pressure. This can be caused by several factors, including fluid leaks, faulty brake seals, or worn-out brake pads. A drop in brake pressure can cause the truck to have difficulty coming to a complete stop, especially when loaded, creating a hazardous situation for operators and crew.
   
2. Brake Fade
   Brake fade occurs when the braking system becomes less effective due to heat buildup, particularly after prolonged use. This problem can be exacerbated when the truck is working in steep or uneven terrain. The intense heat generated by continuous braking can cause the brake fluid to boil, leading to diminished braking power and, ultimately, reduced stopping distance.
   
3. Uneven Brake Wear
   Uneven brake wear on the Volvo A35 is another common issue, often caused by an imbalance in the braking system. This can result from misalignment of the brake pads, improper brake fluid levels, or the failure of certain components like brake calipers or rotors. If left unchecked, uneven wear can cause vibrations during braking and lead to a costly repair bill down the line.
   
4. Brakes Not Engaging
   A more severe issue arises when the brakes on the Volvo A35 fail to engage at all. This could be caused by a complete loss of hydraulic fluid or a failure in the master cylinder, which is responsible for initiating brake pressure. If this happens, the truck becomes nearly impossible to stop, creating a serious risk to the operator and surrounding personnel.
   

Troubleshooting Brake Issues on the Volvo A35
Diagnosing brake issues on the Volvo A35 requires a systematic approach. Here are the steps to troubleshoot and resolve common brake problems:

1. Check Brake Fluid Levels
   The first thing to check when experiencing brake issues is the brake fluid levels. Low brake fluid can result in loss of pressure or complete brake failure. If the fluid levels are low, check for leaks in the hydraulic lines, seals, or around the master cylinder. It's important to use the manufacturer-recommended brake fluid to avoid any compatibility issues.
   
2. Inspect for Leaks
   Leaks in the brake system are often the root cause of brake pressure loss. Inspect the hydraulic lines, calipers, and connections for any visible signs of leakage. Pay close attention to areas where seals and hoses are located. A leaking brake line or seal can prevent the system from building enough pressure to engage the brakes effectively.
   
3. Bleed the Brakes
   Air trapped in the brake lines can cause a spongy or unresponsive brake pedal. If the brakes feel soft or the truck is having difficulty stopping, it may be necessary to bleed the brake lines. This process involves removing the air from the brake system by opening the bleed valves on each brake caliper and allowing the air to escape while adding new brake fluid.
   
4. Inspect Brake Pads and Rotors
   Worn-out brake pads or damaged rotors can lead to poor braking performance and uneven brake wear. Inspect the brake pads for signs of excessive wear, such as thinning or glazing, and replace them if necessary. Similarly, check the brake rotors for scoring or warping, which can contribute to brake fade and vibration.
   
5. Check the Master Cylinder
   If the brakes fail to engage entirely, there may be an issue with the master cylinder. The master cylinder is the heart of the brake system, converting the pressure from the brake pedal into hydraulic pressure. If the master cylinder is damaged or malfunctioning, it may need to be replaced to restore proper brake function.
   

Preventative Maintenance Tips for the Volvo A35 Brake System
While some brake issues are unavoidable due to wear and tear, regular maintenance can help extend the lifespan of the braking system and prevent major failures. Here are a few tips to keep your Volvo A35's brakes in top condition:

1. Perform Regular Brake Inspections
   Regular inspections of the brake system should be a part of the maintenance schedule for your Volvo A35. Look for signs of wear, leaks, and damage to the components. Catching issues early can prevent more severe problems later.
   
2. Maintain Proper Brake Fluid Levels
   Always ensure that the brake fluid is at the proper level and that it's clean. Contaminated or low-quality fluid can lead to poor brake performance and increased wear on the brake components.
   
3. Use Quality Brake Pads and Components
   When replacing brake parts, make sure to use genuine or high-quality aftermarket parts that meet Volvo's specifications. Using inferior components can result in premature wear and compromise the performance of the braking system.
   
4. Monitor Operating Conditions
   Keep track of how the Volvo A35 is being used. In heavy-duty applications, such as long-haul transportation or working on steep inclines, the braking system may be put under more strain. Use the truck within its recommended operating limits to avoid overstressing the brakes.
   
5. Clean the Brakes Regularly
   Dirt and debris can accumulate on the brake components, leading to premature wear. Clean the brake pads and rotors regularly, especially when working in dusty or muddy conditions, to ensure optimal braking performance.
   

Conclusion
Braking issues on the Volvo A35 can have significant consequences for safety and productivity. By understanding the common problems and knowing how to troubleshoot and maintain the brake system, operators can keep their machines running smoothly and avoid costly downtime. Regular maintenance and careful attention to the brake system will help ensure that the Volvo A35 continues to perform reliably in demanding conditions. As with any heavy machinery, proper care and preventative measures are essential to maximize performance and minimize the risk of failure on the job site.