How to Deal with a Porsche Pressure Accumulator Failure
Porsche pressure accumulators are designed to store hydraulic fluid under pressure so that it can be used when needed. The Porsche system uses multiple accumulators, one for each front brake caliper, and others in various places where hydraulics are used. If one of the accumulators fails, the Porsche will enter “limp mode,” which restricts the car to a maximum speed of 35 mph. This is done to prevent further damage to the vehicle.
Pressure accumulator failures are relatively rare, but they can occur if the Porsche is driven hard for extended periods of time or if the ambient temperature is very high. If you suspect that your Porsche has a pressure accumulator failure, it is important to have it checked by a qualified technician as soon as possible.
Reasons for a Pressure Accumulator Failure
If the pressure accumulator fails, the Porsche will lose hydraulic pressure, and the brake system will no longer function correctly. Pressure accumulator failure is a common problem in older Porsches, and it can be caused by a variety of factors, including leaks, rust, and corrosion. Let’s take a closer look:
- Faulty pressure sensor
- Buildup of debris in the system
- Leak in the system
- Problem with the check valve
- Faulty pressure relief valve
- Contamination of the fluid inside the accumulator
Leaks, Valve Problems, and Sensor Issues
With regard to leaks, a pressure accumulator device is filled with nitrogen gas, and it uses a small amount of engine oil to create a seal. Over time, the seals in the pressure accumulator can begin to leak, allowing engine oil and nitrogen gas to mix. This blend of fluids is unable to create an effective seal, and as a result, the pressure accumulator fails. In addition, the leaking oil can cause damage to other engine components.
In most cases, the failure is due to a problem with the valve that controls the flow of air into the accumulator. This valve can become corroded or blocked, preventing the accumulator from charging properly. As a result, the stored energy is slowly released, causing the Porsche to lose power and eventually fail. By understanding how the pressure accumulator works, you can help to prevent this type of failure in your Porsche.
The pressure accumulator is operated by a sensor, which monitors the pressure in the system and activates the pump when necessary. If the sensor fails, it can cause the pressure accumulator to fail. When this happens, Porsche vehicles could experience a loss of power steering and brakes, making them difficult to control. In some cases, the failure of the pressure accumulator can also cause the engine to stall.
How to Fix the Accumulator
Replacing the pressure accumulator is typically the only way to fix this problem. However, if the accumulator is not replaced in a timely manner, it can lead to expensive damage to the Porsche’s steering system.
To fix this problem, our mechanics will first inspect the pressure accumulator and all of its associated components. Once they have pinpointed the cause of the failure, they will replace the faulty part and test the repair to make sure that it is working properly. With our experience and expertise, Porsche owners can rest assured that their car is in good hands when they bring it into our shop.
Oldwick Village Garage
At Oldwick Village Garage our certified Porsche specialists help you take better care of your car without the high 
costs or hassles of going to the dealership. Located in the Oldwick Village area of Tewksbury, we’re proud to be the go-to Porsche shop for drivers all throughout the area.
We believe that quality and customer service should always come first. Our certified mechanics and technicians have decades of experience working with Porsche vehicles. Our shop features the latest diagnostics tools and factory-grade equipment available so we can handle everything your car needs.
We proudly service and maintain luxury automobiles such as your Porsche, along with Mercedes, Audi, BMW, MINI, Jaguar, Land Rover, and other exotic sports cars. If you suspect your vehicle has a pressure accumulator failure, come in today or call us to make an appointment if you’re in or near Tewksbury, NJ.
* Porsche 911 GT3 Car image credit goes to: Sjo.