Brake Bleed - All Four

This procedure bleeds all four brake lines on a 2007 Ram 3500 with Cummins diesel to remove air from the hydraulic system and restore proper brake pedal feel and stopping power.

Warnings

Tools required

Parts

• DOT 3 brake fluid × 1 — Use fresh, unopened DOT 3 fluid meeting FMVSS 116 standards

Fluids

• brake — 1 qt

Preparation

1. Park vehicle on level, solid surface and engage parking brake firmly
2. Chock rear wheels securely with heavy-duty wheel chocks
3. Loosen all four wheel lug nuts while vehicle is on ground (do not remove)
4. Lift vehicle using floor jack at manufacturer-specified jacking points and support on four jack stands rated for at least 10,000 lbs
5. Remove all four wheels and set aside
6. Locate brake fluid reservoir under hood on driver side firewall near master cylinder
7. Clean area around reservoir cap to prevent dirt contamination
8. Remove reservoir cap and inspect fluid level and condition
9. If fluid is dark brown or black, consider a complete system flush instead of bleeding
10. Using turkey baster or fluid siphon, remove old fluid from reservoir until nearly empty (do not drain completely)
11. Refill reservoir to MAX line with fresh DOT 3 brake fluid from unopened container
12. Locate bleeder valves on all four brake calipers: rear calipers on inboard side, front calipers typically on top/rear of caliper body

Procedure

1. 1

   Prepare bleeding sequence and first wheel
   Bleeding sequence for this vehicle should follow the factory service manual specification (commonly RR, LR, RF, LF for this model). Verify the correct sequence for your specific brake system split before beginning. Start at the specified first wheel. Start at right rear wheel. Attach one end of clear plastic hose to bleeder valve on right rear caliper. Place other end of hose into clean container with 1-2 inches of fresh brake fluid to prevent air from being sucked back into system. Verify reservoir is at MAX level before beginning.
2. 2

   Bleed right rear brake
   Have assistant pump brake pedal 3-5 times firmly and hold pedal down with steady pressure. With pedal held down, use 10mm flare nut wrench to open bleeder valve 1/2 to 3/4 turn counterclockwise. Fluid and air bubbles will flow through hose. Watch for pedal to sink to floor. Before pedal reaches floor, close bleeder valve by turning clockwise (do not overtighten). Release brake pedal. Repeat this process 5-8 times until fluid flowing through hose is clear with no air bubbles. Check reservoir level after every 3-4 pumps and refill as needed to keep above MIN line.
   ⚠️Never allow pedal to be released while bleeder valve is open, as this can draw air back into system.
3. 3

   Verify right rear completion
   After no bubbles appear in hose for at least 3 consecutive bleeding cycles, close bleeder valve firmly (snug tight, per FSM specification approximately 8-11 lb-ft - do not strip threads). Remove bleeding hose. Wipe bleeder valve clean. Check reservoir and top off to MAX line with fresh brake fluid.
4. 4

   Bleed left rear brake
   Move to left rear wheel and repeat the same bleeding process. Attach clear hose to left rear bleeder valve with end submerged in container fluid. Have assistant pump and hold brake pedal, open bleeder valve, allow fluid to flow, close valve before pedal bottoms out, then release pedal. Repeat until clear fluid with no air bubbles emerges for at least 3 consecutive cycles. Monitor reservoir constantly and refill as needed.
5. 5

   Verify left rear completion
   Close left rear bleeder valve firmly when complete. Remove hose and wipe clean. Top off brake fluid reservoir to MAX line. Inspect for any leaks around bleeder valve.
6. 6

   Bleed right front brake
   Move to right front wheel. Attach bleeding hose to right front caliper bleeder valve (usually located on upper inboard side of caliper). Submerge hose end in container with clean fluid. Repeat bleeding process: assistant pumps 3-5 times and holds pedal, open bleeder valve, observe fluid flow, close valve before pedal reaches floor, release pedal. Continue until no air bubbles appear for 3 consecutive cycles. Front brakes may require more cycles due to larger caliper piston volume. Check reservoir level frequently.
7. 7

   Verify right front completion
   Close right front bleeder valve securely. Remove hose and clean area. Top off reservoir to MAX line with fresh DOT 3 fluid.
8. 8

   Bleed left front brake
   Move to left front wheel and perform final bleeding operation. Attach hose to left front bleeder valve. Execute same pump-hold-open-close-release sequence until clear, bubble-free fluid flows for at least 3 consecutive cycles. This is the last wheel, so ensure absolutely no air bubbles remain. Check reservoir level constantly throughout process.
9. 9

   Verify left front completion and system check
   Close left front bleeder valve firmly. Remove bleeding equipment. Wipe all four bleeder valves clean and verify they are closed securely. Fill brake fluid reservoir to MAX line. Install reservoir cap securely. With assistant still in vehicle, have them pump brake pedal 10-15 times. Pedal should become firm and hold steady pressure. If pedal feels soft or spongy, repeat bleeding process starting from right rear.
10. 10

    Inspect for leaks
    With vehicle still on jack stands, inspect all four bleeder valves for any fluid seepage or leaks. Check brake lines, calipers, and master cylinder area for any signs of leakage. Wipe away any spilled brake fluid with clean rags and water.

Reassembly

1. Reinstall all four wheels, hand-tightening lug nuts in star pattern
2. Carefully lower vehicle from jack stands using floor jack
3. Once vehicle is on ground, torque all lug nuts to manufacturer specification (typically 135 lb-ft for this model) in star pattern
4. Remove wheel chocks
5. Perform final check of brake fluid reservoir level and top off to MAX line if needed
6. Ensure reservoir cap is installed securely

Verification

• Start engine and allow to idle. Pump brake pedal several times - pedal should feel firm with minimal travel after 2-3 pumps
• With engine running, apply firm steady pressure to brake pedal for 30 seconds - pedal should not slowly sink toward floor
• Check brake fluid reservoir - level should be at MAX line, fluid should be clean and clear amber color
• Perform low-speed test in safe area: drive vehicle at 5-10 mph and apply brakes firmly. Vehicle should stop straight without pulling to either side. Brake pedal should feel solid and responsive
• Perform moderate speed test in safe area: drive at 25-30 mph and apply brakes progressively. Brakes should engage smoothly and evenly without pulsation or soft pedal feel
• Listen for any unusual noises during braking (grinding, squealing beyond normal pad noise)
• After test drive, recheck brake fluid reservoir level and inspect all four wheels for any signs of leakage
• If pedal feels soft, spongy, or requires pumping to achieve firmness, air remains in system and bleeding must be repeated
• If brake warning light illuminates or ABS light stays on, system may require ABS module bleeding with scan tool - seek professional service

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