B1049

Code

LAND ROVER B — Body

Brake fluid level switch

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 28 RU: 21

AI status

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Page language: EN

Causes

Low brake fluid level in the reservoir
Stuck, damaged or contaminated fluid level float/sensor
Corroded, loose or disconnected connector at the switch
Open or shorted wiring between the switch and the body control module/ECU
Blown fuse or poor ground for the circuit
Faulty body control module/ECU input

Symptoms

Brake warning lamp or message on instrument cluster
ABS/traction control warning or limited functionality (depending on vehicle)
Brake fluid level warning indicator illuminated
Intermittent or permanent warning depending on fault type
No noticeable change in brake pedal feel in many cases (warning only)

What to check

Scan vehicle and read freeze frame / live data for brake fluid level input and related faults
Visually inspect brake fluid level in reservoir and check for contamination or debris
Inspect connector and wiring at the fluid level switch for corrosion, looseness, or damage
Check for blown fuses and verify good chassis and ECU grounds
Wiggle test wiring while monitoring live data to reproduce the fault
Check for any related body/ABS codes that may indicate wiring or module issues

Signal parameters

Typical switch type: two‑state float or reed switch (open/closed)
Normal state: closed (continuity) when fluid level is OK; open when fluid is low — implementation can vary by model
Typical electrical behaviour: continuity (~0 Ω) when closed, open circuit (>>1 MΩ) when open
If wired to a pull‑up, expect near battery voltage (~12 V) in one state and ~0 V in the other
Symptoms of wiring fault: intermittent/erratic voltage, short to ground or to +12 V

Diagnostic algorithm

Confirm the code and capture live data with a scan tool. Note when the fault is active.
Visually inspect the brake fluid reservoir: check level, contamination, and float movement.
With ignition ON, backprobe the switch connector and observe the signal while moving the float. Verify expected voltage/continuity change.
Measure continuity between switch pins and the module input. Check for short to ground or battery supply.
Inspect and repair any damaged wiring or corroded connector pins. Apply dielectric grease after cleaning.
If wiring and connector are good, replace the fluid level switch/reservoir assembly and retest.
If problem persists after switch replacement, verify fuse and module grounds, then test/replace the body control module/ECU only if confirmed faulty.
Clear codes and perform road/operational test to confirm repair; re-scan for stored or pending codes.

Likely causes

Low fluid in reservoir (most common)
Contaminated or stuck float inside reservoir
Corroded connector or pin at the switch
Wiring chafe or broken conductor to the switch

Fault status

⚠️ Status

Brake fluid level switch circuit fault detected — low fluid level or sensor/wiring malfunction.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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