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replaced corroded line. ABS & break light on cannot bleed rear brakes. on 1993 Chevrolet G Series Van (G20)

pedal goes all the way down but flied not coming out nether rear bleeders

Asked by for the 1993 Chevrolet G Series Van (G20)
Remove bleeder screws and clean. If bleeders are open,may have to vacuum bleed.
1 more answer
at times the proportion valve sticks close rear bleeders and hit the brake pedal hard then open rear bleeders and let it gravity bleed for 15 min