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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Chassis Diagnostic Procedures - Anti-Lock Brake System) >> Diagnostic Information And Procedures >> Brakes (Cab) - Symptoms >> Symptom: FOUNDATION BRAKE - 78 >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. LOW BRAKE FLUID LEVEL
  2. BRAKE FLUID LEVEL SWITCH SENSE CIRCUIT SHORT TO GROUND
  3. BRAKE FLUID LEVEL SWITCH OPEN/SHORT
  4. BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT OPEN
  5. CAB - INTERNAL CONCERN
  6. FOUNDATION BRAKE INTERMITTENT DTC
TEST ACTION AND APPLICABILITY

TEST ACTION APPLICABILITY
1 Release the Parking Brake.
Turn the ignition off.
Turn the ignition on.
Watch the Instrument Cluster.
Does the Bed Brake Warning Indicator come on and then stay on?
  1. Yes --> Go To 2
  2. No --> Go To 6
 All
2 Turn the ignition off.
Inspect the Brake Fluid Level in the Master Cylinder Reservoir.
Is the Brake Fluid Level Low?
  1. Yes --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 3
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3 Turn the ignition off.
Disconnect the Brake Fluid Level Switch connector
NOTE: Check connector - Clean/repair as necessary.

Disconnect the CAB connector.
NOTE: Check connector - Clean/repair as necessary.

Measure the resistance between ground and the Brake Fluid Level Switch Sense circuit.
Is the resistance below 5.0 ohms?
  1. Yes --> Repair the Brake Fluid Level Switch Sense circuit for a short to ground.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 4
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4 Turn the ignition off.
Disconnect the Brake Fluid Level Switch connector.
NOTE: Check connector - Clean/repair as necessary.
NOTE: Ensure Master Cylinder float switch is not stuck in down position.

On the switch, measure the resistance between both of the Brake Fluid Level Switch terminals.
NOTE: Resistance should be 10,000 ohms with a full Master Cylinder Reservoir.

Is the resistance below 9,500 ohms or over 10,500 ohms?
  1. Yes --> Replace the Brake Fluid Level Switch in accordance with the Service Information.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Go To 5
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5 Turn the ignition off.
Disconnect the Brake Fluid Level Switch connector.
NOTE: Check connector - Clean/repair as necessary.

Measure the resistance of the Brake Fluid level Switch Ground circuit.
Is the resistance below 5.0 ohms?
  1. Yes --> Replace the Controller Antilock Brake in accordance with the Service Information. Refer to the SYMPTOM: *REPLACING THE CONTROLLER ANTILOCK BRAKE  for additional information.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Repair the Brake Fluid Level Switch ground circuit for an open.

    Perform ABS VERIFICATION TEST - VER 1.

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6 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
  1. Yes --> Repair wiring harness/connectors as necessary.

    Perform ABS VERIFICATION TEST - VER 1.

  2. No --> Test Complete.
 All
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