Chassis, generic

C0049 Brake Fluid Level

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the brake fluid level input to the brake or stability module, used to warn the driver and to disable functions that must not run with low fluid. A float switch or sensor in the master-cylinder reservoir signals when fluid drops below a safe level; the module sets this code and lights the red brake warning indicator. A genuine low level usually means worn brake pads that have drawn fluid into the calipers or a leak in the hydraulic system, but Ford documents cases on 2021-2025 Bronco and 2024 Mustang where a false low-level message with C0049 (sub-types :01, :0A) was caused by the reservoir or its sensor and resolved by replacing the reservoir. Low fluid can disable ABS and stability control; the condition should always be inspected because it can indicate a leak.

Likely causes

Low fluid from worn pads or a leak
Faulty reservoir level sensor or float
Reservoir fault causing false reading

Symptoms

  • Red brake warning indicator on
  • Low brake fluid message
  • ABS and stability control may be disabled

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–400
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake fluid reservoir

Related codes

C004BC004AC0044

References: static.nhtsa.gov, static.nhtsa.gov.