A I R S Y S T E M A N D B R A K E STM 5-3805-258-24-1T E S T I N G A N D A D J U S T I N Ga. If the master cylinder stroke is less than 79.0mm (3.11 in), see the subject TOO LITTLEMASTER CYLINDER STROKE.b. If the master cylinder stroke is at its maxi-mum, the brake fluid pressure indicatorwill come on. See the subject TOO MUCHMASTER CYLINDER STROKE.10. Do Steps 1 thru 9 again for the other mastercylinder.1GOVERNOR AIR PRESSURESII950BNS and950BSICut-In Pressure655i14kPe(95 * 2 psi)Cutuut Pressure758= 14 kPe(llo*2pai)I950BNsai! Uad950BSCEIJCut-In Pressure700+0-35kPa(loo+ o-5paiiCutout pressure825 *35kPa(120 y5psi)Too Little Master Cylinder StrokeThe steps that follow are probable causes of toolittle master cylinder stroke. With each step is acorrection for the problem. Too little master cyl-inder stroke can be caused by:1. A failure in the master cylinder.a.b.c.2. ARemove and disassemble the master cyl-inder.Check for a stuck piston (a piston that willnot move).Check for a loose locknut on the air cyl-inder rod.failure in the head assembly of the wheelToo Much Master Cylinder StrokeWhen the master cylinder stroke is at its maxi-mum, one pair (front or rear) of wheel brakes will doall of the work (braking). This condition will causehot (overheating) wheel brakes and axle compon-ents. When this condition exists, the brake fluid pres-sure indicator will come on.Too much master cylinder stroke can be caused by:1. Low brake fluid level in the reservoirs.a. See the LUBRICATION AND MAINTE-NANCE GUIDE.2. Air in the hydraulic circuit.a. See REMOVE AIR FROM WHEELBRAKE HYDRAULIC CIRCUIT (BLEEDTHE BRAKES).3. Leakage in the brake fluid lines.a. See CHECK FOR LEAKAGE IN HY-DRAULIC CIRCUIT.4. Brakes out of adjustment.5. Failure of the seal on the master cylinder piston.brake.a. Remove and disassemble the head assem-bly.b. Check for a stuck piston (a piston that willnot move).4-65
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