Блог

Picture this scenario: A vehicle inspector stands before a car undergoing inspection, noticing its high-mounted brake light remains dark. The owner, a shrewd used car dealer, shrugs and says, "It's disconnected—no need to fix it. It shouldn't affect the inspection." The inspector faces a dilemma: past practice might suggest marking it as "pass with repair recommended," yet the dealer's argument seems plausible. But should a malfunctioning high-mounted brake light truly be ignored? This question touches not just on inspection integrity, but more critically, on road safety.

In vehicle safety inspections (such as the UK's MOT test), brake light verification is paramount. These lights directly affect road safety by signaling deceleration to following drivers. However, standards for high-mounted brake lights (often called "additional brake lights") can create confusion among inspectors. This article clarifies regulatory requirements to help inspectors make accurate judgments when these lights malfunction.

The core issue is straightforward: Should vehicles fail inspection if their high-mounted brake lights are defective? Some argue that disconnected lights can be disregarded. But is this valid? The answer requires nuanced evaluation.

Authoritative references like the VOSA (Vehicle and Operator Services Agency, now part of DVSA) inspection manual and MOT test guidelines provide direction. While some perceive ambiguity regarding additional brake lights, careful analysis reveals clear principles—particularly in understanding the distinction between "fitted" and "connected" components.

Guidelines mandate inspection of all "fitted" brake lights. This means any installed high-mounted brake light cannot be ignored, regardless of functionality. However, for a light to require inspection, it must be both "fitted" and "connected."

• Fitted: The physical presence of a light assembly (housing, socket, etc.). Factory-installed or aftermarket-added lights qualify as "fitted," even with non-functional bulbs or LEDs, provided the structure remains intact.
• Connected: Electrical linkage to the braking system. When the brake pedal is pressed, current should flow to illuminate the light. Cut, removed, or otherwise disconnected wiring negates this status.

If a high-mounted brake light is both fitted and connected, inspectors apply standard testing. For multi-element lights (e.g., LED arrays), functionality exceeding 50% of components with correct color permits passing. Complete failure necessitates further evaluation.

Inspectors must verify (without disassembly) that a light is fully assembled and wired before failing it. This proves difficult when lights might be decorative shells lacking electronics. In such cases, if integrity cannot be confirmed, inspectors should "give the benefit of the doubt to the owner" and pass the vehicle.

Practical applications of these principles include:

• Functional failure: Light is intact and wired but doesn't illuminate (burned-out bulb, LED failure, short circuit). Result: Fail.
• Intentional disconnection: Light is intact but wiring is deliberately severed. If disconnection is evident without repair attempts, result: Pass.
• Non-functional housing: Empty plastic shell without electrical components. Verified emptiness warrants passing.
• Partial functionality: Over 50% of LEDs/bulbs work with proper color. Result: Pass.

Inspectors should:

• Examine physical and electrical conditions thoroughly
• Corroborate owner statements with physical evidence
• Consult vehicle specifications when uncertain
• Document contentious cases photographically

Example 1: A 2015 Volkswagen Golf's LED high-mounted brake light shows only 30% functionality. Verdict: Fail (connected and fitted, but below 50% threshold).

Example 2: A 2018 Honda CR-V's light wiring is intentionally cut, with no repair evidence. Verdict: Pass (fitted but demonstrably disconnected).

High-mounted brake light inspection demands meticulous assessment. Inspectors must balance regulatory compliance with practical constraints, always prioritizing road safety. When doubt exists, favoring the owner is permissible—provided it doesn't compromise safety. By rigorously applying these standards, inspectors uphold both fairness and public protection.

Ultimately, failing a vehicle for high-mounted brake light defects hinges on confirmed "fitted and connected" status. Inspectors must visually verify assembly and wiring integrity, applying the 50% illumination rule where applicable. Ambiguities should benefit owners, but never at safety's expense. Mastery of these principles empowers inspectors to make confident, consistent decisions that safeguard all road users.