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Technical bulletins

16 Engineers’ responsibilities for modifications that may affect a heavy vehicle’s brakes

This technical bulletin replaces memo 53 and memo 53a.

In all cases where brake certification is required, the lead HVSC on the project must ensure that it is carried out prior to the final certification of the project.

This responsibility cannot be delegated to the vehicle owner or the testing station but is an integral factor in any certification that may affect the brakes and must be carried out prior to the final certification of the project.

Brake certification category

HVEK

Brake certification for heavy vehicles built or modified in New Zealand and non-powered heavy vehicles imported into New Zealand can only be performed by an engineer with the HVEK category. No other category of HVSC may certify heavy vehicle brakes. All heavy vehicle brake repairs or modifications, except those specifically allowed, must be certified by a HVSC with this category, whether the certification requires Schedule 5 or not.

Other certification categories that may affect braking

HVET

Where a vehicle has a towing connection added or modified and the modification MAY affect the braking system, the vehicle must be referred to a HVEK category engineer.

Note 1

The only exception is where the modification is covered in the vehicle’s body builders’ manual and the manufacturer provides written evidence that vehicle remains within its original brake certification. In this case the HVET takes responsibility by confirming on the LT400 that HVEK is not required, quoting supporting information.

Note 2

Where any brake component(s) have been altered or modified (unless specifically allowed), these alterations or modifications must be referred to a HVSC with the HVEK category. It is the HVEK engineer’s responsibility to confirm that the braking system has not been affected by the HVET certification or modification. If the braking system has been affected, it is the HVEK engineer’s responsibility to perform and certify the required modifications.

HVEC

A HVEC category engineer cannot certify brake modifications on a heavy vehicle. When an HVEC category engineer performs a modification or certification that may affect the brakes on a heavy vehicle, that engineer must consult with an HVEK category engineer.

Note 3

The only exception is where the modification is covered in the vehicle’s body builders’ manual and the manufacturer provides written evidence that vehicle remains within its original brake certification. In this case the HVEC takes responsibility by confirming on the LT400 that HVEK is not required, quoting supporting information.

Note 4

Where an air supply is provided by the vehicle manufacturer for the purpose, a HVEC can add an air auxiliary without requiring additional certification.

Note 5

Where any brake component(s) have been altered or modified (unless specifically allowed), these alterations or modifications must be referred to an HVEK category engineer. It is the HVEK engineer’s responsibility to confirm that the braking system has not been affected by the HVEC certification or modification. If the braking system has been affected, it is the HVEK engineer’s responsibility to perform and certify the required modifications.

Withdrawn brake certification categories

HVEB (Brake coding)

Since 1 July 2008 this category of certification can no longer be performed and the category has been withdrawn. Where vehicles have this certification, it remains valid until the vehicle is modified. After modification, the vehicle must be certified by an HVEK category engineer.

HVEH (Brake certifier)

Since 1 July 2008 this category of certification can no longer be performed and the category has been withdrawn. Where vehicles have this certification, it remains valid until the vehicle is modified. After modification, the vehicle must be certified by an HVEK category engineer.

Page added 9 April 2018 (see amendment details)