Brake Bleed - All Four

This procedure bleeds all four brake calipers on a 2021-2024 Ford F-150 3.5L EcoBoost to remove air from the hydraulic system and restore proper brake pedal feel and stopping performance.

Warnings

Tools required

Parts

• Motorcraft DOT 4 LV Brake Fluid × 1 — PM-20 or equivalent DOT 4 LV

Fluids

• Motorcraft DOT 4 LV Brake Fluid — 1 qt

Preparation

1. Park vehicle on level surface, place transmission in Park, engage parking brake, and place wheel chocks behind rear wheels
2. Verify you have sufficient DOT 4 LV brake fluid (minimum 1 quart, preferably unopened)
3. Open master cylinder reservoir cap and inspect fluid level and condition. If fluid is dark or contaminated, consider full system flush
4. Using turkey baster or fluid extractor, remove old fluid from master cylinder reservoir to approximately 1/2 full
5. Refill reservoir to MAX line with fresh Motorcraft DOT 4 LV brake fluid
6. Raise vehicle using floor jack and support securely on jack stands at all four corners
7. Remove all four wheels and set aside

Procedure

1. 1

   Prepare bleeding equipment
   Attach clear plastic bleeder hose to bleeder wrench or directly to bleeder screw. Place other end of hose into catch bottle with approximately 2 inches of fresh brake fluid in bottom. This prevents air from being sucked back into caliper during bleeding. Keep master cylinder reservoir cap nearby but do not install yet to allow for easier refilling.
2. 2

   Bleed right rear caliper
   Begin with right rear (passenger side rear). Locate bleeder screw on back of caliper. Clean bleeder screw area with brake cleaner to prevent contamination. Attach bleeder hose. Have assistant pump brake pedal 5-7 times and hold firm pressure. Open bleeder screw 1/2 to 3/4 turn while assistant maintains pedal pressure. Fluid and air bubbles will flow into hose. When pedal reaches floor, close bleeder screw BEFORE assistant releases pedal. Repeat process until fluid flows clear without air bubbles (typically 5-10 repetitions). Check and refill master cylinder reservoir after every 3-4 bleeds.
   ⚠Always close bleeder screw BEFORE releasing brake pedal, or air will be drawn back into system.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
3. 3

   Bleed left rear caliper
   Move to left rear (driver side rear) caliper. Repeat exact bleeding procedure as right rear: clean bleeder area, attach hose, pump and hold pedal, open bleeder screw, close before pedal release. Continue until no air bubbles appear and fluid runs clear. Check master cylinder reservoir level frequently and maintain between MIN and MAX lines.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
4. 4

   Bleed right front caliper
   Move to right front (passenger side front) caliper. Locate bleeder screw on rear of caliper body. Clean area thoroughly. Repeat bleeding procedure: pump pedal 5-7 times, hold pressure, open bleeder 1/2 to 3/4 turn, observe fluid flow, close bleeder before pedal release. Continue until bubble-free. Front calipers typically require more bleeding cycles than rear. Refill reservoir as needed.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
5. 5

   Bleed left front caliper
   Move to left front (driver side front) caliper. This is the final wheel to bleed. Repeat bleeding procedure until fluid runs completely clear with zero air bubbles. This corner may take additional cycles as it is furthest from master cylinder. After final bleeding, ensure bleeder screw is torqued properly.
   ℹ️If pedal feel does not improve or remains spongy after bleeding all four corners, air may be trapped in ABS module requiring scan tool activation and bleeding procedure.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
6. 6

   Perform second bleeding cycle
   Starting again at right rear, perform a second complete bleeding cycle through all four wheels in same sequence (RR, LR, RF, LF). This ensures any residual air is removed. One or two pumps per wheel should produce bubble-free fluid if first cycle was successful. Top off master cylinder reservoir to MAX line with fresh fluid.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
7. 7

   Final reservoir fill and inspection
   Fill master cylinder reservoir to MAX line with fresh Motorcraft DOT 4 LV fluid. Wipe away any spilled fluid from reservoir area and painted surfaces immediately. Securely install reservoir cap. Inspect all four bleeder screws for tightness and verify no fluid leaks are present at any bleeder.
8. 8

   Reinstall wheels and perform initial brake test
   Reinstall all four wheels. Torque lug nuts to specification in star pattern. Lower vehicle to ground. Before driving, pump brake pedal several times with engine off. Pedal should feel firm and consistent by third pump. If pedal sinks to floor or feels spongy, DO NOT DRIVE and repeat bleeding procedure.
   ⚠️Do not attempt to drive vehicle if brake pedal feels soft, spongy, or sinks to floor. This indicates air remains in system or a leak exists.
   Torque spec

   Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Ensure all bleeder screws are torqued to 10 Nm (7 lb-ft) - do not overtighten as they are easily stripped
2. Verify master cylinder reservoir is filled to MAX line and cap is installed securely
3. Wheel lug nuts must be torqued to 140 Nm (103 lb-ft) in star pattern
4. Dispose of used brake fluid properly at recycling center - never pour down drain

Verification

• With engine off, pump brake pedal 5-6 times. Pedal should become firm and hold constant height without sinking
• Start engine and verify brake pedal height does not change significantly (slight drop is normal with power assist)
• Check master cylinder reservoir for proper fluid level - should be at MAX line
• Inspect all four bleeder screws and surrounding areas for any fluid seepage or leaks
• Perform low-speed brake test in safe area (parking lot): at 5-10 mph, apply brakes firmly. Vehicle should stop smoothly without pulling to either side and pedal should feel solid
• If available, perform moderate brake test at 20-25 mph in safe area to verify proper stopping power
• After test drive, recheck master cylinder fluid level and inspect for leaks
• If pedal feel is not firm, if vehicle pulls during braking, or if brake warning light illuminates, do not drive and seek professional service immediately

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