HOT OR DRAGGING BRAKES

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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TM 5-3805-258-24-1 A I R S Y S T E M A N D B R A K E S T E S T I N G A N D A D J U S T I N G HOT OR DRAGGING BRAKES T o o l s N e e d e d : 0 t o 1 3 8 0 k P a ( 0 t o 2 0 0 p s i ) G a u g e . 6 . 4 m m ( . 2 5 i n . ) d i a m e t e r b y 1 5 0 mm ( 6 i n . ) l o n g b o l t . Hot or dragging brakes are caused when the brakes do not release correctly. When the stroke of the master cylinder is too much, the brake fluid pressure indicator, master fault light and fault alarm will come ON. Brake hydraulic pressure is 16 times the amount of air pressure. WARNING Make reference to WARNING on first page of AIR SYSTEM AND BRAKES TESTING AND AD- JUSTING section. Use the procedure that follows to correct a prob- lem of hot or dragging brakes: L O C A T I O N T O I N S T A L L G A U GE 1. Drain valve for the air reservoir. NOTE: If the brake fluid pressure indicator is on, go to Step 9b. 1. Install a 0 to 1380 kPa (0 to 200 psi) gauge in drain valve (1) of the air reservoir. 2. Remove brake fluid pressure switch (2), and the indicator rod from the air/hydraulic cyl- inder. Use a 6.4 mm (.25 in.) diameter bolt that is 150 mm (6 in.) long, in place of the in- dicator rod. NOTE: Two bolts can be used to check both master cylinders at the same time. A I R / H Y D R A U L I C C Y L I N D E RS 2. Brake fluid pressure switch for rear wheel brakes. 3. Brake fluid pressure switch for front wheel brakes (under b r a c k e t ) . 3. Start the engine and let the air pressure go up to cutout pressure. Stop the engine. (See Chart, page 4-60). NOTE: Make sure air pressure is above 620 kPa (90 psi) when the master cylinder stroke is checked. 4. 5. 6. 7. 8. 9. I N D I C A T O R R O D R E M O V E D A ND 6 . 4 m m ( . 2 5 i n . ) B O L T I N S T A L L E D 4.150 mm (6 in.) bolt. With the brake fully released, push bolt (4) down until it comes in contact with the piston in the air chamber. Measure the length of the rod. Push and hold the right brake pedal down. Push bolt (4) down again, until it comes in contact with the piston. Measure the length of the rod at this point. The difference in the two lengths is the stroke of the master cylinder. 4-64

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