Failing Power Steering Pump: If the power steering pump begins to fail you may notice some squealing when turning the wheel. When seals and other parts of the power steering pump begin to wear down, the pump cannot maintain a consistent level of fluid pressure.
Return to CHAPTER 20. Control activities are the policies, procedures, techniques, and mechanisms that help ensure that management's response to reduce risks identified during the risk assessment process is carried out. In other words, control activities are actions taken to minimize risk.
From RationalWiki. An experimental control, often referred to as a control group, is a population or set of objects that is statistically similar to the set being tested, on which no changes are implemented. In psychology and biology, the control group is very important, since results are often statistical rather than concrete. For instance, in testing a drug for a malady, some percentage of the test subjects will heal with no intervention (or heal at some rate in a third group, people getting an existing remedy).