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.
Things You’ll Need
Tire iron, 2-ton or greater capacity floor jack, 4 jack stands, 1 can PB Blaster, Liquid Wrench, Freeze-Off or similar penetrating spray, Open-end wrench set, 1 gallon or larger drip pan, 1 cup or empty butter container, Assistant or second person, Locking pliers or electrical tape, 1-pint DOT 3 or higher brake fluid