ABS (DIAGNOSTICS) > General Diagnostic Table
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Symptoms |
Problem parts | |
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Vehicle instability during braking |
Vehicle is pulled to either right or left side. |
• ABSCM&H/U (solenoid valve) • ABS wheel speed sensor • Brake (caliper, piston and pad) • Wheel alignment • Tire specifications, tire wear and air pressures • Incorrect wiring or piping connections • Road surface (uneven, camber) |
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Vehicle spin |
• ABSCM&H/U (solenoid valve) • ABS wheel speed sensor • Brake (pad) • Tire specifications, tire wear and air pressures • Incorrect wiring or piping connections | |
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Poor brake performance |
Long braking/stopping distance |
• ABSCM&H/U (solenoid valve) • Brake (pad) • Air in brake line • Tire specifications, tire wear and air pressures • Incorrect wiring or piping connections |
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Wheel lock |
• ABSCM&H/U (solenoid valve, motor) • ABS wheel speed sensor • Incorrect wiring or piping connections | |
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Brake drag |
• ABSCM&H/U (solenoid valve) • ABS wheel speed sensor • Master cylinder • Brake (caliper and piston) • Parking brake • Axle and wheels • Brake pedal play | |
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Long brake pedal stroke |
• Air in brake line • Brake pedal play | |
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Vehicle vertical pitching |
• Suspension play or fatigue (reduced damping) • Incorrect wiring or piping connections • Road surface (uneven) | |
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Unstable or uneven braking |
• ABSCM&H/U (solenoid valve) • ABS wheel speed sensor • Brake (caliper, piston and pad) • Tire specifications, tire wear and air pressures • Incorrect wiring or piping connections • Road surface (uneven) | |
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Vibration and/or noise (while driving on slippery roads) |
Excessive pedal vibration |
• Incorrect wiring or piping connections • Road surface (uneven) |
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Noise from the ABSCM&H/U |
• ABSCM&H/U (mount bushing) • ABS wheel speed sensor • Brake line | |
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Noise from front of vehicle |
• ABSCM&H/U (mount bushing) • ABS wheel speed sensor • Master cylinder • Brake (caliper, piston, pad and rotor) • Brake line • Brake booster and check valve • Suspension play or fatigue (reduced damping) | |
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Noise from rear of vehicle |
• ABS wheel speed sensor • Brake (caliper, piston, pad and rotor) • Parking brake • Brake line • Suspension play or fatigue (reduced damping) | |