TM 5-3805-258-24-1A I R S Y S T E M A N D B R A K ESA I R C I R C U I T F O R T H EW H E E L B R A K E SS Y S T E M S O P E R A T I O NA I R C Y L I N D E R ( W i t h B r a k e s A c t i v a t e d )5. Brake fluid pressure (overstroke) switch. 6. Piston. 7. Rod. 8. Spring. 9. Indicatorrod. 10. Air inlet. 11. Master cylinder.When the brakes are released, spring (8) returnsthe piston, rod and master cylinder piston to theiroriginal positions.If piston (6) comes in contact with indicator rod(9), rod (9) will move and open switch (5). Thiswill cause the brake fluid pressure indicator to comeON. If this does happen, there is a problem in thehydraulic circuit for the wheel brakes. See the Test-ing and Adjusting section on HOT OR DRAG-GING BRAKES. After piston (6) comes in contactwith indicator rod (9), the rod must be manuallypushed back into the air cylinder to its originalposition.3-84
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