Brake Bleed - All Four

This procedure bleeds all four brake calipers to remove air from the hydraulic brake system, restoring proper brake pedal feel and stopping performance.

Warnings

Tools required

Parts

• Motorcraft DOT 4 LV Brake Fluid × 2 — PM-20

Fluids

• Motorcraft DOT 4 LV Brake Fluid — 1.5 qt

Preparation

1. Park vehicle on level ground and place wheel chocks behind rear wheels
2. Verify you have sufficient DOT 4 LV brake fluid (at least 1.5 quarts of fresh, sealed fluid)
3. Open hood and locate brake fluid reservoir on driver side of master cylinder
4. Check current fluid level and condition - dark or contaminated fluid indicates full system flush may be needed
5. Loosen all wheel lug nuts 1/4 turn while vehicle is on ground
6. Raise vehicle with floor jack at manufacturer-specified lift points and support securely on four jack stands
7. Remove all four wheels and set aside
8. Clean all four brake bleeder screws with brake cleaner to prevent dirt from entering system

Procedure

1. 1

   Prepare master cylinder reservoir
   Remove the brake fluid reservoir cap. Using a turkey baster or fluid transfer pump, remove old fluid from reservoir until approximately 1/2 full. Dispose of old fluid properly. Refill reservoir to MAX line with fresh Motorcraft DOT 4 LV brake fluid. Keep reservoir bottle nearby as you will need to monitor and refill frequently during bleeding process.
2. 2

   Locate bleeder screws on all four calipers
   Identify the bleeder screw on each caliper. On this F-150, bleeder screws are located on the inboard side of each caliper body (facing toward the engine/center of vehicle). Front calipers: bleeder is on top rear portion of caliper. Rear calipers: bleeder is on top portion of caliper. Verify you can access each bleeder before beginning.
   ℹ️Do not remove bleeder screws at this stage - only locate and identify them for the bleeding sequence.
3. 3

   Bleed right rear caliper (first)
   Start at the right rear caliper (passenger side rear). Attach clear plastic bleeder hose to bleeder screw nipple and place other end in catch container. Have assistant sit in driver seat. Assistant should pump brake pedal 3-5 times and hold firm pressure on pedal. With assistant holding pedal down, slowly open bleeder screw 1/2 to 3/4 turn using brake bleeder wrench. Fluid and air will flow into hose. When flow stops and pedal reaches floor, close bleeder screw before assistant releases pedal. Repeat this process until no air bubbles appear in discharged fluid (typically 5-10 repetitions). Check and refill master cylinder reservoir after every 3-4 bleeder cycles.
   ⚠️Bleeder screw MUST be closed before assistant releases brake pedal, or air will be drawn back into system.
   ⚠️Monitor master cylinder reservoir constantly. Never let it drop below MIN line or system will draw in air.
   Torque spec

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

   Bleed left rear caliper (second)
   Move to left rear caliper (driver side rear). Attach bleeder hose to bleeder screw and place in catch container. Repeat the same bleeding procedure: assistant pumps and holds pedal, you open bleeder screw, fluid flows, close bleeder before pedal release. Continue until no air bubbles appear in fluid. Refill master cylinder reservoir to MAX line.
   ⚠️Maintain master cylinder reservoir level above MIN line at all times.
   Torque spec

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

   Bleed right front caliper (third)
   Move to right front caliper (passenger side front). Attach bleeder hose to bleeder screw. Repeat bleeding procedure: pump and hold pedal, open bleeder, close before release. Continue until fluid runs clear with no air bubbles. The front calipers may require more cycles due to larger caliper volume. Refill master cylinder reservoir to MAX line.
   ⚠Front brake calipers hold more fluid and may take additional bleeding cycles to clear all air.
   Torque spec

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

   Bleed left front caliper (fourth)
   Move to left front caliper (driver side front) - this is the final caliper in the sequence. Attach bleeder hose and repeat bleeding procedure until fluid is completely clear with zero air bubbles. This caliper, being furthest from master cylinder, is critical for complete system bleeding. After final bleeding, refill master cylinder reservoir to MAX line.
   ℹ️The left front caliper is last in sequence as it is typically the furthest point from the master cylinder in the hydraulic circuit.
   Torque spec

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

   Verify bleeder screw torque
   Using a torque wrench, verify all four bleeder screws are properly torqued to exactly 10 Nm (7 lb-ft). Start with right rear, then left rear, right front, left front. Clean any spilled brake fluid from calipers, rotors, and wheels with brake cleaner.
   ⚠Bleeder screws are brass and will strip if overtightened. 10 Nm is very light torque - use torque wrench, not feel.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
8. 8

   Final master cylinder service
   Remove any spilled fluid from around master cylinder reservoir with clean cloth. Top off reservoir to MAX line with fresh DOT 4 LV brake fluid. Install reservoir cap securely. Wipe down entire master cylinder area to verify no leaks.
   ⚠Brake fluid will damage paint. Clean any spills on body panels immediately with water.
9. 9

   Reinstall wheels and lower vehicle
   Reinstall all four wheels, threading lug nuts by hand to prevent cross-threading. Using torque wrench, tighten lug nuts to 140 Nm (103 lb-ft) in a star pattern. Carefully raise vehicle slightly off jack stands with floor jack, remove jack stands, and lower vehicle completely to ground. With vehicle weight on wheels, re-torque all lug nuts to 140 Nm (103 lb-ft) in star pattern to final specification.
   ⚠Always torque lug nuts in star pattern to prevent rotor warping. Final torque must be performed with vehicle weight on ground.
   Torque spec

   Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Ensure all four bleeder screws are torqued to 10 Nm (7 lb-ft) and not leaking
2. Verify master cylinder reservoir is at MAX line and cap is installed securely
3. Confirm all wheels are installed with lug nuts torqued to 140 Nm (103 lb-ft) in star pattern
4. Clean any brake fluid residue from calipers, rotors, wheels, and painted surfaces

Verification

• With engine off, pump brake pedal 10-15 times - pedal should feel firm and consistent, not spongy
• Start engine and verify brake pedal does not sink to floor under constant pressure
• Check for fluid leaks at all four bleeder screws and verify they are dry
• Verify master cylinder reservoir level is between MIN and MAX lines
• Perform low-speed test drive in safe area (under 10 mph) to verify brakes engage smoothly and evenly
• CRITICAL: Perform full-speed brake test in safe area - brakes should engage firmly without pulling to either side, and pedal should remain firm throughout stop
• If pedal feels spongy or vehicle pulls during braking, air remains in system - repeat bleeding procedure
• Re-check master cylinder fluid level after test drive and top off if needed

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