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The 1989 Chevrolet C/K 1500 was equipped with rear wheel antilock brakes, commonly known as RWAL. The antilock brake system or ABS require a primary and secondary bleeding to remove all air from the system. The system combines the ABS module with the primary brake system and also includes a combination valve and an isolation-dump valve. All of these components must be bled on the 1989 C/K 1500 RWAL system. Bleeding the brakes will create stronger stopping power by expelling air that weakens it from the system. The RWAL system should be bled any time a line is removed or after replacing any brake line components.
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