KNORR-BREMSE K002856N00 Brake accumulator

Description

The Audi brake accumulator, also known as a brake pressure reservoir, plays a crucial role in your car’s braking system by providing instantaneous high pressure when needed for safe and efficient braking. Here’s a brief description:

Function:

• The accumulator acts as a storage tank for pressurized brake fluid. It’s constantly pre-charged with hydraulic pressure by a pump, usually powered by the engine.
• When you press the brake pedal, the accumulator instantly releases this stored pressure into the braking system, boosting the initial brake force and reducing pedal travel.
• This immediate pressure boost improves braking response time, especially during emergency braking situations, contributing to safer driving.
• Additionally, the accumulator helps to maintain consistent brake pressure even if the engine stalls or the pump momentarily fails, providing a level of redundancy for added safety.

Location:

• The brake accumulator is typically located under the hood, mounted near the firewall or in the engine bay. It’s often a spherical or cylindrical metal component.

Types:

• Nitrogen-filled: Most common on Audi models, using compressed nitrogen gas to pre-charge the accumulator.
• Spring-loaded: Less common, uses a compressed spring instead of gas for pre-charging.

Signs of a failing brake accumulator:

• Soft or spongy brake pedal: Indicates insufficient pressure buildup, often requiring a harder pedal press for braking.
• Delayed braking response: Time lag between pressing the pedal and the car actually slowing down.
• Warning light: Some Audi models have a specific brake accumulator warning light that might illuminate if there’s a problem.

Maintenance:

• While the accumulator itself is generally robust, the pre-charging mechanism (pump and pressure regulator) might require periodic inspection and service as part of your car’s maintenance schedule.
• If you suspect a problem with the brake accumulator, it’s crucial to have it diagnosed and addressed by a qualified mechanic to ensure optimal braking performance and safety.