Gas Pressure of Pressure Accumulator, Checking
Gas pressure of pressure accumulator; checkingNote
- gas pressure of new accumulator 78-82 bar (1131-1189 psi) at 20°C (68°F)
- minimum gas pressure 30 bar (435 psi) at 20°C (68°F)
Work sequence
- with engine not running, press brake pedal about 20 times to reduce system pressure
- disconnect wire on warning light switch and remove switch (arrow)
- attach pressure gauge with hollow bolt and copper washers to brake servo unit
NOTE: Attach thick copper washer between brake servo unit and banjo fitting and thin copper washer between hollow bolt and banjo fitting
- start engine and let idle until pressure gauge reads approx. 140 bar (2030 psi)
- turn ignition OFF
- pump brake pedal until pressure drops slowly
- pressure reading at which gauge pointer drops down rapidly to "0" is gas pressure of pressure accumulator
- if pressure is lower than 30 bar (435 psi) accumulator must be replaced
- remove pressure gauge
- install brake light warning switch and reconnect wire connector
- check all connections for leaks