TM  10-3930-638-24&P 2-43. SERVICE BRAKE MAINTENANCE (cont) c. Hydraulic Brake Valve (cont). (1)  Brake  Master  Cylinder  (cont). STEP LOCATION ITEM ACTION REMARKS 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 exces- sive 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 immedi- ately,  and  obtain  medical  aid  immediately. 1 Master  cylinder Clean Use  cleaning  solvent and dry with clean cloth External  only INSPECTION 2 Replace  if  worn,  or  if  threads  damaged 3 Replace  master  cylinder  assembly  if cracked,  threads  damaged, REMOVAL 4 Front  chassis, a. Three cap screws (1) Loosen and remove Support master cylinder body (3) bottom left side and lock washers (2) b.  Brake  master  cylin- Pull  and  remove From power assist unit der body (3) Cap screw (1), lock Inspect washer (2) and fill plug (4) Body (3) Inspect 2-298  (Page  2-299  Blank)    Change  2