This procedure covers the removal and replacement of the brake proportioning valve on a 2014 Ram 2500 with 6.7L Cummins diesel engine, including brake system bleeding and verification.

Warnings

Tools required

Parts

• Brake proportioning valve assembly × 1 — Use OEM Mopar specification
• Brake line sealing washers (if equipped) × 4 — Use OEM specification

Fluids

• Mopar DOT 4 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level ground and set parking brake firmly
2. Place wheel chocks behind rear wheels
3. Open hood and locate brake master cylinder reservoir - do NOT open yet
4. Gather all tools, new parts, and fresh brake fluid before beginning
5. Position drain pan and absorbent pads under work area to catch brake fluid spills
6. Locate the proportioning valve assembly on the frame rail near the master cylinder (driver side)
7. If brake lines are corroded, apply penetrating oil to all fittings 15-30 minutes before loosening

Procedure

1. 1

   Secure vehicle and access proportioning valve
   Raise the front of the vehicle using a floor jack and support securely on jack stands rated for the vehicle weight. The proportioning valve is typically mounted on the driver side frame rail below the master cylinder. Clean the area around the valve and brake line fittings with brake cleaner and a wire brush to remove dirt and corrosion.
2. 2

   Prepare for fluid loss
   Position drain pan directly below the proportioning valve. Have shop rags ready to contain fluid spills. Check master cylinder fluid level and mark the current level - this helps determine how much fluid to add later. Do not open the master cylinder cap yet.
3. 3

   Disconnect brake lines from proportioning valve
   Using flare nut wrenches (NOT standard open-end wrenches), carefully loosen each brake line fitting connected to the proportioning valve. There are typically 4 connections: one inlet from the master cylinder and three outlets to the wheels. Loosen fittings slowly to control fluid flow. Mark or photograph each line position to ensure correct reinstallation. Cap or plug open lines immediately to minimize fluid loss and contamination.
   ⚠Use only flare nut wrenches to prevent rounding off brake line fittings. Rounded fittings will require brake line replacement.
4. 4

   Remove proportioning valve mounting bolts
   Locate the mounting bolts securing the proportioning valve to the frame bracket. Remove these bolts and carefully extract the valve assembly. Some brake fluid will drain from the valve - catch it in the drain pan. Inspect the mounting bracket for damage or corrosion.
   Torque spec

   Proportioning Valve Bolts15 Nm (11 lb-ft)
5. 5

   Inspect and prepare new valve
   Compare the old and new proportioning valves to verify correct replacement part. Inspect all brake line ports on the new valve for debris or damage. If the valve uses sealing washers at the line connections, install new washers on each fitting. Do not remove protective caps from the new valve ports until ready to connect brake lines.
6. 6

   Install new proportioning valve
   Position the new proportioning valve in the mounting bracket, ensuring proper orientation. Thread in mounting bolts by hand first to ensure proper alignment, then torque to specification in a cross-pattern if multiple bolts are present. The valve must be securely mounted with no movement.
   ⚠Verify the valve is oriented correctly - the inlet port must connect to the master cylinder line. Incorrect installation will cause brake system failure.
   Torque spec

   Proportioning Valve Bolts15 Nm (11 lb-ft)
7. 7

   Connect brake lines to new valve
   Remove protective caps from valve ports. Thread each brake line into its correct port by hand first - fittings should thread smoothly without force. Once hand-tight, use flare nut wrenches to torque fittings to specification. Follow the pattern: inlet line first, then outlet lines. Do not overtighten as this can damage the flare seat.
   ⚠️Cross-threaded or improperly torqued brake line fittings will leak and cause brake failure. If a fitting does not thread smoothly by hand, stop and investigate.
   Torque spec

   Brake Line Fittings15 Nm (11 lb-ft)
8. 8

   Fill master cylinder reservoir
   Open the master cylinder reservoir cap. Fill to the MAX line with fresh DOT 4 brake fluid from an unopened container. Keep the reservoir at least half-full throughout the bleeding process - check frequently and refill as needed. Never let the reservoir run dry or air will enter the system.
   ⚠Do not overfill the reservoir. Brake fluid expands when hot and can overflow, damaging paint and components.
9. 9

   Bleed brake system - Rear passenger wheel
   Begin with the wheel furthest from the master cylinder (right rear). Attach bleeder hose to the bleeder screw and submerge the other end in a container with clean brake fluid. Have an assistant pump the brake pedal 3-4 times and hold pressure. Open the bleeder screw 1/2 turn while pedal is held down. Fluid and air will exit. Close bleeder before pedal reaches the floor. Repeat until fluid flows with no air bubbles. Check master cylinder level frequently.
   Torque spec

   Bleeder Screw18 Nm (14 lb-ft)
10. 10

    Bleed brake system - Rear driver wheel
    Move to the left rear wheel and repeat the bleeding process: pump pedal 3-4 times, hold pressure, open bleeder screw, close before pedal bottoms out. Continue until no air bubbles appear in the discharged fluid. Refill master cylinder as needed.
    Torque spec

    Bleeder Screw18 Nm (14 lb-ft)
11. 11

    Bleed brake system - Front passenger wheel
    Move to the right front wheel and repeat the bleeding process. This wheel is closer to the master cylinder and may purge air more quickly. Continue until fluid flows clear with no bubbles. Monitor master cylinder level.
    Torque spec

    Bleeder Screw18 Nm (14 lb-ft)
12. 12

    Bleed brake system - Front driver wheel
    Complete bleeding at the left front wheel, which is closest to the master cylinder. Use the same procedure: pump, hold, open, close. Continue until absolutely no air bubbles appear. This is the final wheel in the sequence.
    Torque spec

    Bleeder Screw18 Nm (14 lb-ft)
13. 13

    Verify system and check for leaks
    Fill master cylinder to MAX line. With engine off, pump brake pedal firmly 10-15 times. Pedal should become firm and maintain height. If pedal remains soft or sinks, repeat bleeding process. Inspect all brake line connections at the proportioning valve for any signs of leakage. Wipe connections dry, then pump pedal and recheck - even small weeps are unacceptable.
    ⚠️A soft or sinking brake pedal indicates air in the system or a leak. Do NOT drive the vehicle until pedal is firm and holds pressure.
14. 14

    Perform final leak inspection
    With vehicle still raised on jack stands, have an assistant apply firm brake pedal pressure (50-60 lbs) and hold for 30 seconds. Carefully inspect all fittings at the proportioning valve, looking for any fluid seepage. Check the valve body itself for cracks or leaks. Any leakage requires immediate correction before vehicle operation.

Reassembly

1. Lower vehicle from jack stands and remove chocks
2. Top off master cylinder to MAX line with fresh DOT 4 fluid and reinstall cap securely
3. Clean any spilled brake fluid from frame, components, and ground with water
4. Dispose of used brake fluid according to local regulations - never pour down drains or onto ground

Verification

• With engine running, pump brake pedal several times - pedal should be firm and hold steady pressure without sinking
• Check that brake pedal height and feel are normal compared to before repair
• Perform a low-speed (5-10 mph) brake test in a safe area - vehicle should stop straight without pulling to either side
• Recheck all proportioning valve fittings for leaks after test drive
• Verify master cylinder fluid level is between MIN and MAX lines
• Perform a controlled stop from 25-30 mph in a safe area - brakes should engage smoothly and evenly with no vibration or pulling
• If any abnormality is detected (soft pedal, pulling, unusual noises, leaks), do NOT drive vehicle - seek professional diagnosis immediately

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