Range Rover Classic
ABS
3
FAULT DIAGNOSIS
ABS FAULT AND REMEDY CHART
SYMPTOM
POSSIBLE CAUSE
CHECK
REMEDY
ABS warning light on
ABS electrical fault
Check ABS electrical
circuit to identify fault
Change component if
necessary
High sensor air gaps
Push in sensors
Both warning lights ON.
Pedal travel and pedal
force increased
No booster pressure (fluid
loss)
Check reservoir fluid level
and inspect system for
leaks
Rectify as necessary and
refill reservoir
No booster pressure
(pump not operating)
Check electrical supply to
pump
Rectify electrical supply if
necessary
Pump faulty
Change hydraulic pump
Both warning lights ON
(no additional symptoms)
Malfunction of pressure
switch
Disconnect pressure
switch
a) If light remains
illuminated vehicle wiring
faulty
a) Test wiring, change
harness if necessary
b) If lights extinguish
pump defective
b) Change pump
Brake fluid warning light
ON
Fluid loss
Check reservoir fluid level
and inspect system for
leaks
Rectify leakage, refill
reservoir
Reservoir fluid level
switch malfunction
Check fluid level switch
Change reservoir
cap/switch
Pressure switch
malfunction
Check switch with
pressure gauge
a) If wiring faulty
a) Replace harness
b) If switch faulty
b) Change hydraulic
pump
Brake fluid warning light
ON. Pedal travel
increased, foot pressure
normal
Fluid loss from hydrostatic
circuit
Check reservoir level and
inspect system for leaks
Rectify leakage and refill
reservoir
Rebleed as necessary
