Lets see, the suspension and the vehicle tilting to one
side...
Road conditions, if not favorable, would make the bus tilt to one
side also. Next is the air reservoir, if not enough air, the bus
will also tilt to one side. Take a SMRT Habit for example (like
this, I use TIB1224Y again), after a night of parking, it will tend
to tilt towards the back. The engine weight would tend to
pressurize the rear axle, making the axle 'sink' down, and the air
escapes from the compressed cylinders supporting the axle and that
particular section of the bus. The problem was 'solved' once, but
it came again, when the rear section 'sinks' even when the bus is
in operation, warranting a repair and the bus captain had to go off
service to change to another bus.
Another case affects the entire bus, when all of the axles lost the
air and practically the bus becomes 'low floor' (means it no longer
tilts to only one side, both sides go down together). Spotted with
such a situation was a WA bodied Merc of SBST, the entire bus sunk
onto its suspension supports and when it goes over a bump, yes, the
passengers bump together.
Maintenance, yes, daily operations still brings trouble. Why hook
operational headaches with fare rise and etc?
