Car MOT Manual 2012 onwards
3.2 Hand Operated Brake Control Valves
InformationThis inspection applies to all vehicles with a secondary brake operating mechanism in addition to, or in place of, the normal parking brake lever.
This Includes hand operated valves fitted to control spring brakes or lock actuators.
Method of Inspection1. Examine the control for:
a. fractures, damage or excessive corrosion
b. security of operating valve spindle
c. amount of travel
d. loose connections or leaks
Note: It must be remembered that certain pneumatic components are subject to some degree of leakage.
e. wear in gate and/or lever locating mechanism
f. damping of the lever gate on valves controlling lock actuators.
2. Check the valve unit for:
a. security of its mounting
c. correct functioning.
Reason for Rejection1
a. Deliberate modification which significantly reduces the original strength, excessive corrosion, damage, fracture or an inadequate repair of the control
b. an insecure operating valve spindle
c. the control cannot be moved over its full travel
d. a loose connection or a leak in the system
e. a gate and/or locating mechanism so worn that the lever is not safely retained in the on or off position
f. insufficient or no damping of the lever gate on valves controlling lock actuators.
a. An insecure valve unit
b. the lever located so that it cannot be operated satisfactorily from the normal driving position
c. a valve malfunctioning