Complete flush and replacement of brake hydraulic fluid in all four wheel cylinders/calipers and master cylinder to restore proper brake system performance and remove contaminated fluid.

Warnings

Tools required

Parts

• DOT 4 Brake Fluid × 2 — Use DOT 4 specification only

Fluids

• DOT 4 Brake Fluid — 0.5 qt

Preparation

1. Park vehicle on level ground and set parking brake firmly.
2. Chock front wheels securely.
3. Raise rear of vehicle and support on jack stands at rear frame rails.
4. Remove all four wheels to access brake bleeders.
5. Locate master cylinder reservoir under hood on driver side firewall.
6. Clean master cylinder reservoir cap and surrounding area to prevent dirt contamination.
7. Remove master cylinder reservoir cap and inspect fluid level and condition.
8. If fluid is extremely dark or contaminated, extract as much old fluid as possible from reservoir using turkey baster or syringe before beginning.
9. Refill reservoir to MAX line with fresh DOT 4 brake fluid.
10. Locate all four brake bleeder valves: front calipers on inboard side, rear wheel cylinders on backing plate.

Procedure

1. 1

   Prepare bleeding sequence
   The recommended bleeding sequence (furthest from master cylinder to nearest) is: right rear, left rear, right front, left front. Verify the correct factory sequence in the GM service manual for your specific master cylinder configuration. Verify all bleeder valves are accessible and not seized before beginning. Verify all bleeder valves are accessible and not seized before beginning.
2. 2

   Begin with right rear wheel cylinder
   Attach clear tubing to the right rear bleeder valve. Submerge the other end of tubing in a clean jar containing 1-2 inches of fresh DOT 4 fluid to prevent air from being drawn back. Have assistant sit in driver seat. Instruct assistant to pump brake pedal 3-4 times and hold firm pressure on pedal.
3. 3

   Bleed right rear wheel
   With assistant holding firm pedal pressure, open bleeder valve 1/2 to 3/4 turn counterclockwise. Old fluid and air bubbles will flow through tubing. When pedal reaches floor, close bleeder valve snugly. Release pedal. Repeat this cycle until fluid runs clear with no air bubbles. Check master cylinder reservoir frequently and refill to maintain level above MIN line. Never allow reservoir to empty.
4. 4

   Bleed left rear wheel cylinder
   Move tubing to left rear bleeder valve. Repeat the pump-and-hold bleeding procedure. Continue until fluid runs clear with no air bubbles visible in the tubing. Tighten bleeder valve snugly when finished. Check and refill master cylinder reservoir.
5. 5

   Bleed right front caliper
   Move tubing to right front caliper bleeder valve located on inboard side of caliper. Repeat pump-and-hold bleeding procedure. Front disc brakes typically require more cycles to fully purge old fluid. Continue until fluid is completely clear with no air bubbles. Tighten bleeder valve. Check and refill reservoir.
6. 6

   Bleed left front caliper
   Move tubing to left front caliper bleeder valve. Repeat pump-and-hold bleeding procedure until fluid runs completely clear with no air bubbles. This is the final wheel in the sequence. Tighten bleeder valve snugly. Fill master cylinder reservoir to MAX line.
7. 7

   Verify pedal feel
   With engine off, pump brake pedal several times. Pedal should feel firm and consistent with good resistance. If pedal feels soft or spongy, air remains in the system—repeat bleeding sequence starting at right rear. Pedal should not sink slowly to floor when held under pressure.
8. 8

   Test parking brake system
   Release parking brake. Verify rear drum parking brake mechanism operates freely and does not drag. Re-engage parking brake firmly. This system is independent but should be verified after any rear brake work.
9. 9

   Reinstall wheels
   Reinstall all four wheels. Torque wheel lug nuts to factory specification in star pattern. Lower vehicle from jack stands. Perform final torque check on all lug nuts with wheels on ground.

Reassembly

1. Ensure master cylinder reservoir is filled to MAX line with fresh DOT 4 fluid and cap is securely installed.
2. Double-check that all four bleeder valves are closed snugly to prevent leaks.
3. Verify no brake fluid was spilled on painted surfaces—clean immediately if found.
4. Dispose of old brake fluid properly at recycling center—never pour down drain.

Verification

• Start engine and pump brake pedal. Pedal should feel firm with good resistance and not sink to floor.
• With engine running, apply firm brake pressure. Pedal should hold steady without slowly sinking.
• Perform low-speed test drive in safe area. Brake pedal should respond immediately with firm, consistent pressure.
• Test brakes at 15-20 mph multiple times to verify proper stopping power and no pulling to either side.
• Inspect all four bleeder valves and brake line connections for any signs of fluid leakage.
• Re-check master cylinder fluid level after test drive—level should remain at MAX line.
• If pedal feels soft, spongy, or vehicle pulls to one side during braking, air remains in system or other brake issues exist—do not drive vehicle and repeat procedure or seek professional service.

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