{
  "$type": "site.standard.document",
  "description": "A vehicle parking brake system pneumatically actuates an air cylinder (46) to mechanically lock a wheel brake (12) in an applied position in response to a parking demand request. The air cylinder (46) includes an extendable shaft (42) that supports a lock member (62). When a parking demand request…",
  "path": "/patents/1077947",
  "publishedAt": "2005-05-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T13/68",
    "ARVINMERITOR TECHNOLOGY LLC [US]"
  ],
  "textContent": "A vehicle parking brake system pneumatically actuates an air cylinder (46) to mechanically lock a wheel brake (12) in an applied position in response to a parking demand request. The air cylinder (46) includes an extendable shaft (42) that supports a lock member (62). When a parking demand request is initiated by moving a hand control (56), an air chamber is pressurized with air from a parking reservoir via a valve assembly to apply the wheel brake. Air pressure is released from the air cylinder and the lock member is moved into engagement with a brake component to lock the wheel brake in the applied condition. The wheel brake remains locked even if pressure is released from the air chamber (26). When a release command is initiated, the air cylinder is pressurized and the lock member is moved out of engagement with the brake component.",
  "title": "Pneumatically actuated parking brake"
}