A mechanical, or electrical accumulator???

Accumulator is what the British call a capacitor.

The size of the accumulator is the same,means 64bit.

As a rule, you'll need to purchase an appropriate re-seal kit for your accumulator. You will then need to disassemble your accumulator, clean everything and reassemble the accumulator with the new seals that came in your kit.

The accumulator stores brake fluid under very high pressure. An electric pump keeps the accumulator pressurized with brake fluid. When you press the brake pedal, pressurized fluid from the accumulator operates the brakes.