Chevrolet Cobalt Service & Repair Manual: Brake Hydraulic Systems Drain, Refill & Bleed

Chevrolet Cobalt Service & Repair Manual / Brakes / General Procedures / Brake Hydraulic Systems Drain, Refill & Bleed

Caution: Brake fluid may irritate eyes and skin.
Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away fluid.
1. Place clean shop cloth beneath brake master cylinder to prevent brake fluid spills.
2. With ignition OFF and brakes cool, apply brakes three to five times, or until brake pedal effort increases significantly, in order to deplete brake booster power reserve.
3. Fill brake master cylinder reservoir with GM approved brake fluid from a clean, sealed brake fluid container. Ensure that brake master cylinder reservoir remains at least half full during bleeding procedure. Add fluid as required to maintain proper level.
4. Install box end wrench onto righthand rear wheel hydraulic circuit bleeder valve.
5. Install a clear hose over end of bleeder valve.
6. Submerge open end of clear hose into a clear container partially filled with GM approved brake fluid from a clean, sealed brake fluid container.
7. Have an assistant slowly depress brake pedal fully and maintain steady pressure on pedal.
8. Loosen bleeder valve to purge air from wheel hydraulic circuit.
9. Tighten bleeder valve, then have assistant slowly release brake pedal.
10. Wait 15 seconds, then repeat steps seven through nine until clean bubble free fluid flows from bleed valve.
11. Repeat steps four through 10 on wheels in following order: Lefthand front, lefthand rear, then righthand front.
12. After completing final wheel hydraulic circuit bleeding procedure, ensure that each of four wheel hydraulic circuit bleeder valves are properly tightened.
13. Fill brake master cylinder reservoir to maximum fill level with GM approved brake fluid from a clean, sealed brake fluid container.
14. Slowly depress and release brake pedal. Inspect feel of brake pedal.
15. If brake pedal feels spongy, repeat bleeding procedure again.
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    See also:

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