TM  10-3930-638-24&P 2-31.   SENDING   UNITS   AND   SWITCHES   MAINTENANCE   (cont) STEP LOCATION ITEM ACTION REMARKS REMOVAL 1 Hydraulic  brake a. Two wire leads Grasp  and  pull From stop light switch valve, bottom b. Stop light switch Remove Turn counterclockwise and pull from rear of vehicle hydraulic brake valve CLEANING WARNING Dry cleaning solvent (P-D-680), used to clean parts is toxic and flammable. Wear protective goggles and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use near open flame or excessive heat and don’t smoke when using it. Failure to do so could cause serious injury. If you become dizzy while using cleaning  solvent,  get  fresh  air  immediately,  and  get  medical attention. If contact with skin or clothes is made, flush with large amounts of water. If contact with eyes is made, wash eyes with water  immediately,  and  obtain  medical  aid  immediately. e. Stop Light and Hydraulic Filter Switches (cont). (2) Stop Light Switch. 2-173