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ABS 3 FAULT DIAGNOSIS ABS FAULT AND REMEDY CHART SYMPTOM POSSIBLE CAUSE CHECK REMEDY ABS warning light on ABS electrical fault Check ABS electrical 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 |