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Atwood Hydraulic Brake System (part4)

NOTE: On tandem axle trailers, bleed brakes on rear most axle first.

11. Loosen bleeder fitting at top of brake assembly one turn.

12. Apply actuator (see Figure 9) and then tighten bleeder fitting. Return actuator to released position. Again, loosen bleeder valve one turn and apply actuator. Repeat this procedure until the fluid expelled from the bleeder hose is free of air bubbles. During this procedure, the master cylinder reservoir fluid level must be maintained at no less than 1/2 full and no more than 1/2" from top of reservoir.

attwood-fig9

NOTE: Use power bleeder or bar with 2" diameter hitch ball attached (Figure 9). Do not use breakaway cable for purpose of bleeding brake system.

13.When no air bubbles are visible, close bleeder valve securely and remove the bleeder hose.

14. Repeat steps 9. 10, 11 and 12 for remaining brake, and then brakes on forward axle.

15. If installation is tandem axle with brakes on both axles, repeat bleeding procedure on rear axle brakes for second time to assure positive purging of all air in system.

16. After bleeding has been completed, re-check fluid level in master cylinder.

CAUTION: DO NOT use brake fluid drained from brake system in refilling master cylinder as such fluid may have contaminants from system.

On to part 5.

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