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Q: brake petal went to the floor on 2003 Chevrolet Silverado 2500 HD

Brake petal is very soft, still have some brakes. replaced master cylinder and problem is still there
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You may not have gotten the air out of the brake system, especially if you have ABS brakes. If you do, there's a 'Scan Tool Bleeding Procedure' which requires a scanner to bleed the ABS system. You may need to go to a GM specialist with a scan tool to get the brakes bled.
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