Hydraulic address

Every time I change the fludio in a hydraulic direction?
Checks that are performed in a hydral direction pump?
What is the procedure to change a steering wheel if you have airbag?
How diagnosis noise in a vehicle?

The fluid of the hydraulic direction is usually not changed, it is abitually stuffed when it is missing but being an ATF dverias oil if you want That loosen, marks the tooth before the same with straight wheels so that it does not be crooked, the noise diagnosis is immensely large depends on the noise and its source.