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    MOT Test of Brakes

    Brake efficiency and balace is usually checked on a roller brake tester. In certain cases where a roller brake tester may not be used (for example on certain 4-wheel drive vehicles) it may be necessary to check brake efficiency and balance on a road test, with a portable decelerometer.

    Inside the car

    • Electronic parking Brake (EPB) warning device must not be indicating a malfunction
    • Electronic stability control (ESC) component must not be obviously missing, damaged or inappropriately repaired or modified
    • ESC wiring must not be excessively damaged
    • ESC warning lamp must be present, working and not indicating a fault
    • ESC Swithch must not be insecure or faulty
    • A brake slack adjuster must not be defective or incorrectly installed
    • A brake fluid warnimg lamp must not be inoperative or illuminated
    • Class (v): Electronic braking system (EBS) warning device must not be inoperative or indicating a fault

    Anti-lock braking system (if fitted) warning lamp is checked for:

    • Function
    • Sequence of operation

    Footbrake

    • Sufficient reserve travel on the footbrake
    • Pedal rubber not worn to excess
    • Correct operation of the servo assistance system
    • ABS and ESC components and associated wiring/switch checked for presence and condition

    Parking brake
    This could be hand, foot or electronically operated. Checked for reserve travel so that it doesn't reach the stops on application. The mountings will be checked for security and/or corrosion.

    The brake lever or control will be a fail if:

    • missing
    • insecure
    • defective or located so that it cannot be satisfactorily operated
    • any inappropriate repair or modification

    During a decelerometer test, if vehicle deviates from a straight line when parking brake applied then this becomes a fail.

    Anti-Lock Braking (ABS) and Electronic Stability Control (ESC) Systems

    The inspection applies to all systems, original equipment or 'aftermarket'. Will be checked for being fitted (if originally specified), illuminating, not indicating fault, ABS to follow correct sequence.
    If ABS or ESC system has been intentionally rendered inoperative the whole system, with the exception of sensor rings or other components which form part of another component.

    Reasons for rejection:

    • component missing, damaged, inappropriately repaired or modified
    • wiring excessively damaged

    Warning Lamp

    • Missing
    • Does not illuminate
    • Indicates a fault
    • (For ABS) does not follow the correct sequence

    ABS or ESC

    • Component missing or excessively damaged
    • Wiring excessively damaged
    • Inappropriately repaired or modified
    • Switch faulty or insecure

    Under bonnet checks
    Master cylinder and servo unit are checked for leaks with the engine on and the brakes applied
    Servo unit will be checked to ensure it is operating correctly
    Visible metal or flexible brake pipes will be checked for corrosion, condition, fouling or leaks

    Under vehicle checks

    Flexible brake pipes and any other metal brake pipes visible beneath the car are checked
    Discs and drums (external only) checked for condition and contamination
    Brake back plates and caliper securing devices are checked for condition and security
    Condition of the brake pads will be checked if visible
    The assistant operates the handbrake and the condition of the linkages and/or cables is checked.
    On some vehicles there will be a brake compensating valve beneath the car which will need to be inspected for fluid leaks

    General
    All components checked for security, condition and operation.

    Reason for failure:

    • Component inappropriately repaired or modified
    • Insecurely mounted
    • Excessively weakened
    • Damaged
    • Retaining or locking device insecure
    • Cable, rod or clevis joint insecure
    • A load sensing valve seized, inoperative, function impaired or incorrectly adjusted
    • Air brake actuator dust cover missing or not preventing ingress of dirt etc.

    Brake performance check
    The performance of the front and rear brakes and handbrake are checked for efficiency and balance using specialised equipment.