Brake pressure accumulator sphere

 

The function of the brake pressure reservoir

is usually unknown, and its importance is often underestimated. As long as it does its service without complaint, we even don't take any notice of it. If, however, the nitrogen gas escaped by aging (diffusion), the brake servo might fail unexpectedly. Possibly one is unpleasantly taken by surprise because in such case a considerably much larger foot force is required, to brake the vehicle effectively.

Certain sign of waning accumulator pressure, is regular flashing of the warning lamp for the hydraulic pressure system, after the engine got started. When this is indicated, it is high time to renew or to repair the pressure accumulator. Also when the brake pedal feels harder very quickly, when it is actuated for a several times with engine cut off, you should consider to check the pressure reservoir immediately. A new or overhauled brake pressure reservoir allows minimum 20 (up to 30) brake actuations before the brake force will decrease.

A repair of brake pressure accumulators

is possible in many cases, as long as the accumulator has not been operated for too long with very low nitrogen pressure ratio. Furthermore the diaphragm and the internal valve must not be damaged. For safety reasons, brake pressure reservoirs without any residual pressure cannot be overhauled even if the membrane seems still okay.

Our service includes a preliminary examination for residual nitrogen pressure ratio and proper function of the pressure-relief– and –retention valve. If the valves and the diaphragm are intact, the accumulator can be equipped with an additional inflation valve and filled up to nominal pressure with nitrogen.  Such a retrofitted pressure accumulator can later be filled with little effort.

Repair options

We provide repairs of pressure accumulators for the Audi models Type 44, C4 and D11 (Audi V8 Quattro) and ABS accumulator spheres for Saab 900, VW Passat and Alfa Romeo as well.

Tip:

When replacing the pressure accumulator it makes sense to renew the hydraulic oil.

Low cost bundle: Accumulator Repair and hydraulic oil.