Knowledge of Removing and Replacing Light Vehicle Chassis Units and Components — City and Guilds of London Institute Vocationally-Related Qualification Motor Vehicle & Transport Revision

    This subtopic covers the fundamental principles of light vehicle chassis systems, including steering, suspension, braking, and wheel/tyre assemblies, and t

    Topic Synopsis

    This subtopic covers the fundamental principles of light vehicle chassis systems, including steering, suspension, braking, and wheel/tyre assemblies, and the correct procedures for their inspection, replacement, and testing. Learners gain the practical skills needed to maintain vehicle safety and performance, adhering to manufacturer specifications and health and safety regulations. Mastery of these tasks is essential for entry-level technicians performing routine service and repair operations.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Knowledge of Removing and Replacing Light Vehicle Chassis Units and Components

    CITY AND GUILDS OF LONDON INSTITUTE
    vocational

    This topic covers the fundamental principles of light vehicle chassis systems including steering, suspension, braking, and wheel/tyre assemblies, emphasizing safe removal, replacement, and testing procedures. Learners gain practical skills to diagnose faults, use specialist tools, and ensure compliance with manufacturer specifications and safety standards, preparing them for real-world workshop tasks.

    2
    Learning Outcomes
    7
    Assessment Guidance
    9
    Key Skills
    2
    Key Terms
    10
    Assessment Criteria

    Assessment criteria

    City & Guilds Level 2 Diploma in Light Vehicle Maintenance & Repair Competence
    City & Guilds Level 1 Diploma in Vehicle Maintenance

    Topic Overview

    The City & Guilds Level 1 Diploma in Vehicle Maintenance introduces you to the fundamental principles of keeping vehicles safe, reliable, and roadworthy. This qualification covers essential topics such as vehicle systems, routine servicing, and basic fault diagnosis. You'll learn how to inspect and maintain key components like brakes, steering, suspension, and electrical systems, ensuring you understand the 'why' behind each procedure. This foundation is critical for anyone pursuing a career as a motor vehicle technician or progressing to Level 2.

    Vehicle maintenance is not just about fixing problems—it's about preventing them. By mastering routine checks like oil changes, tyre inspections, and brake pad replacements, you help extend vehicle life and improve safety. The course also emphasises workshop health and safety, correct tool usage, and environmental best practices. These skills are directly applicable in real-world garages and form the backbone of professional competence in the automotive industry.

    Key Concepts

    Core ideas you must understand for this topic

    • →Vehicle systems: Understand the function and basic layout of the engine, transmission, braking, steering, suspension, and electrical systems.
    • →Routine servicing: Know the schedule for oil changes, filter replacements, fluid checks, and tyre rotations as per manufacturer guidelines.
    • →Health and safety: Always follow workshop safety rules, use personal protective equipment (PPE), and dispose of waste correctly.
    • →Basic fault diagnosis: Learn to use visual inspection, listening for unusual noises, and simple test equipment to identify common faults.
    • →Tool identification and use: Be able to select and safely use hand tools, power tools, and lifting equipment like jacks and axle stands.

    Learning Objectives

    What you need to know and understand

    • Understand how light vehicle steering and suspension systems operate, Understand how light vehicle braking systems operate, Understand how light vehicle wheel and tyres systems operate, Understand how to check, replace and test light vehicle chassis units and components
    • Understand how light vehicle steering and suspension systems operate, Understand how light vehicle braking systems operate, Understand how light vehicle wheel and tyres systems operate, Understand how to check, replace and test light vehicle chassis units and components

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Award credit for correctly identifying steering and suspension components and explaining their functions during removal/replacement tasks.
    • Demonstrate safe jacking and support of the vehicle before commencing any chassis work, with reference to the vehicle manufacturer's recommended lifting points.
    • Evidence of using appropriate torque settings when refitting components such as wheel bearings or suspension arms, as per manufacturer data.
    • Show correct procedure for bleeding brakes after replacing hydraulic components, ensuring firm pedal feel and no leaks.
    • Carry out wheel alignment check after suspension component replacement, verifying camber, caster, and toe settings are within tolerance.
    • Inspect and measure tyre tread depth and pressure, comparing to legal and manufacturer requirements during a wheel and tyre service.
    • Award credit for correctly identifying and explaining the function of key steering and suspension components, such as ball joints and shock absorbers.
    • Award credit for demonstrating safe and accurate removal and replacement of a brake disc and pad set, including proper use of the correct tools and torque settings.
    • Award credit for performing a systematic wheel and tyre check, including tread depth, pressure, and condition, in accordance with legal and manufacturer requirements.
    • Award credit for verifying correct operation of replaced chassis components through a functional road test or static test, as appropriate.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡When completing written assignments, always refer to the specific vehicle manufacturer's procedures and data; generic answers may not score full marks.
    • 💡In practical assessments, verbally explain your actions to the assessor, especially safety checks and torque validation, to demonstrate knowledge.
    • 💡For the testing phase, systematically check for correct operation, unusual noises, and fluid leaks, and document your findings.
    • 💡Use the PDI (Pre-Delivery Inspection) checklist as a mental guide for final checks after chassis work to ensure nothing is missed.
    • 💡Always consult the vehicle-specific workshop manual for torque values, tightening sequences, and special tools—generic procedures may not be acceptable in assessments.
    • 💡When describing diagnostic processes, explicitly state the use of safe jacking and supporting techniques before starting any chassis work.
    • 💡Use correct technical terminology in written tasks—refer to 'road spring' rather than 'coil spring' when applicable, and distinguish between 'disc' and 'rotor' as per manufacturer literature.
    • 💡Always refer to the manufacturer's data for torque settings, fluid types, and service intervals—this shows you understand the importance of precision.
    • 💡In practical assessments, demonstrate your safety checks first (e.g., isolating the battery, using PPE). Examiners award marks for methodical, safe working.
    • 💡When diagnosing faults, explain your thought process out loud. For example, 'I'm checking the brake pads because the pedal feels spongy, which could indicate wear or air in the system.'

    Common Mistakes

    Common errors to avoid in your coursework

    • Forgetting to loosen wheel nuts before jacking the vehicle, causing difficulty and potential damage.
    • Failing to mark the position of adjustable components (e.g., track rod ends) before removal, leading to misalignment.
    • Reusing locking nuts or bolts that are designed as single-use, compromising safety.
    • Not checking the condition of related components such as bushes or ball joints while the chassis unit is removed.
    • Overlooking the need to torque critical fasteners to specification, leading to loose components or component damage.
    • Confusing the roles of shock absorbers and coil springs, assuming both resist roll rather than controlling oscillation.
    • Neglecting to clean the hub face before fitting a new brake disc, leading to disc run-out and vibration.
    • Applying incorrect torque to wheel nuts, either over-tightening causing stud stretch or under-tightening risking wheel detachment.
    • Failing to use a suitable puller for separating suspension joints, causing damage to rubber boots and ball joints.
    • Misconception: 'If a part looks fine, it doesn't need replacing.' Correction: Many components, like timing belts and brake fluid, degrade over time regardless of appearance. Always follow service intervals.
    • Misconception: 'You can use any oil in an engine.' Correction: Using the wrong oil viscosity can cause engine damage. Always check the manufacturer's specification.
    • Misconception: 'Jacking up a car is straightforward.' Correction: Incorrect jacking points can damage the vehicle or cause it to fall. Always use the recommended points and support with axle stands.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of how a car works (e.g., wheels, engine, steering wheel).
    • •Familiarity with simple hand tools like spanners and screwdrivers.
    • •Basic maths and English skills to interpret measurements and service schedules.

    Key Terminology

    Essential terms to know

    • Understand how light vehicle steering and suspension systems operate, Understand how light vehicle braking systems operate, Understand how light vehicle wheel and tyres systems operate, Understand how to check, replace and test light vehicle chassis units and components
    • Understand how light vehicle steering and suspension systems operate, Understand how light vehicle braking systems operate, Understand how light vehicle wheel and tyres systems operate, Understand how to check, replace and test light vehicle chassis units and components

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    Knowledge of Removing and Replacing Light Vehicle Chassis Units and Components (City and Guilds of London Institute Vocationally-Related Qualification)