TM 5-3805-260-24AIR REMOVAL FROM BRAKES(Bleeding the Brakes)VALVES THAT LET THE AIR OUT (TRACTORBRAKES)(Bleed Screws)Let the air out of system for the wheel brakeswhich is activated by the master cylinder.1.Check the fluid level in the reservoir. Theprimary level must be .5 in. (12.7 mm) from thetop of the reservoir.NOTE: To keep air out of the master cylinder, fluid mustalways be seen in the reservoir while air is being let outof the system. When filling an empty system, loosen thecaps on the master cylinders until fluid comes out, thentighten the caps.2.Fasten .25 in. (6.4 mm) ID. (inside dimension)hoses to the bleed screws that lets the air out.Put the loose end of the hoses into ajar that hasenough fluid in it so that the end of the hoses areunder the surface of the fluid.3.Push the brake pedal down and release itseveral times until the indicator rods make ashorter stroke.4.Keep the brake pedal down and look at theindicator rod.5.Open the bleed screws that lets the air out andlook at the fluid that comes out of the hoses.Close the bleed screws when the indicator rod isextended 1.44 in. (36.6 mm).6.Do Steps 3, 4, and 5 until the fluid that goes outof the hoses has no air bubbles.7.Fill the reservoir to .50 in. (12.7 mm) from thetop of the reservoir when necessary.8.If necessary do the above procedure for thescraper.VALVES THAT LET THE AIR OUT (SCRAPERBRAKES)(Bleed Screws)2-154
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