There have been many reports of Audi and VW drivers seeing an error message on their dashboards stating that their brakes are restricted. In some cases, there’s another message that says “keep driving.”
An error message of this type can be alarming, especially since it informs you that your brake system may be malfunctioning. Why are brake servos restricted error messages displayed?
I’ll answer this question in this article, telling you what the message could be about and how to fix it. Let’s get started.
Error message for restricted brake servos
Firstly, we should understand what the brake servo is and how it works so we can interpret the error message.
By boosting the force applied to the brake pedal by the driver, the brake servo or brake booster assists in braking.
Brake servos increase brake force to increase responsiveness and efficiency.
A brake servo restriction error message is displayed in your car if there has been an error in the normal operation of the brake servo.
You might also damage other parts of the braking system if your brake servo is faulty, like your Anti-lock Brake System (ABS).
Driving for a long time without paying attention to the warning can also result in potential brake system issues. In the event of a brake servo restricted error message, your car needs to be checked and fixed as soon as possible.
When does “Brake Servo Restricted” happen?
Is there a reason your VW/Audi dashboard says brake servo restricted? The most common causes are:
Sensor failure in the brake servo
Damaged or faulty brake servo pressure sensors are the most common cause of this error message. Your vehicle’s braking system is monitored by this sensor.
In order to provide braking assistance, it sends signals to the brake servo to adjust the pressure as needed.
If your pressure sensor is damaged or faulty, it can reduce the efficiency of the brakes, or delay the sending of signals, resulting in erratic braking.
Several Audi and Volkswagen drivers have reported experiencing a slight stiffening of the brakes when the message appears. As a result of the error message appearing, some motorists have reported having to brake with greater force.
It is evident here that a brake servo needs to be in good working order.
Problems with software
Errors in software are another possible cause. In today’s automobiles, electronic control systems are used in most, if not all, cases.
It is possible for the brake servo to miscommunicate with other parts of the braking system if there are software errors in the electronic control units that control the brakes.
Problems with brake master cylinders
It is the master cylinder that converts the force applied to the brake pedal into hydraulic pressure that ensures the brakes are activated.
You might experience decreased hydraulic pressure if your master cylinder is faulty. If the brake servo is affected by this decreased pressure, your dashboard will show a warning.
Vacuum System
Vacuum pressure supplied by the intake manifold is a major factor in brake booster leaks. In this case, it is highly likely that the brake servo will malfunction if there are leaks in the vacuum system.
You may find leaks at a variety of parts, including fittings, hoses, and even the brake servo itself. You want to have your car repaired as soon as possible if the error message is caused by a vacuum leak.
Fixing Brake Servo Restricted Errors
There is a systematic approach you need to take when dealing with the brake servo restricted error. Audi/Volkswagen Service Centers can properly diagnose and fix the issue, so always take it there.
The brake servo restricted error is fixable with these fixes:
1. Replace the pressure sensor in the brake servo:
Get a replacement with the same pressure sensor if you’re suspecting it’s the sensor (it’s most of the time). A certified technician can help you.
2. Fix all leaks in the vacuum system:
It is very important to ensure that the vacuum system on your Audi does not leak. The proper inspection of your car requires the assistance of a professional.
3. Check the master cylinder:
Another possibility is this. A technician can check the master cylinder if any issues persist after you have tried the above two fixes.
4. Update the software on your car:
It is also advisable to attempt to update all the brake system software. It is important to update your software regularly to avoid receiving an error message stating that the brake servo is restricted.
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Frequently Asked Questions
What does “Brake Servo Restricted” mean?
The “Brake Servo Restricted” warning indicates that there is a problem with the brake servo system, which can affect the braking performance of the vehicle. This may be due to a failure of the brake servo pressure sensor or issues with the vacuum pump that assists in brake operation.
What causes the Brake Servo Restricted warning?
This warning can be triggered by several issues, including:
Faulty brake servo pressure sensor: This is the most common cause and can often be resolved by replacing the sensor.
Loss of vacuum: If the engine is off or there is insufficient vacuum, the brakes may not have servo assistance, making them harder to press.
ABS or ESC system failures: Problems with these systems can also lead to this warning being displayed.
Can I continue driving if I see this warning?
While some vehicles may allow you to continue driving after this warning appears, it is not recommended. The braking system could be compromised, increasing the risk of an accident. It’s crucial to address any brake-related warnings immediately.
What are the potential costs associated with fixing this issue?
The cost of replacing a faulty brake servo pressure sensor is typically under £100. However, if the problem is not addressed and leads to ABS failure, repair costs could exceed £3,000 for a new ABS system.
Is this issue common in certain vehicle brands?
Yes, this problem has been frequently reported in vehicles from the Volkswagen Group (VAG), including models like Audi and VW T-Roc. Many users have noted similar experiences across various forums.
