4 Modification thresholds for the Heavy Vehicle Brakes Rule
|This technical bulletin replaces the 62 series of memos.|
|Modifications that may not require an LT400 by an HVEK|
Note: Any modifications outside these limits 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 modification and issue an LT400 to that effect. If the braking system has been affected, it is the HVEC engineer’s responsibility to ensure that the HVEK engineer certifies the required modifications.
Where the vehicle has an electronic braking system or an integral stability control system the vehicle manufacturer must provide approval, in writing, for the modifications.
Re-bodying a standard-compliant (Note 1) heavy vehicle with change of location of the centre of gravity by no more than +/- 500mm (either horizontally or vertically).
|Modifications that always require an LT400 by an HVEK|
A heavy vehicle that has been brake-coded to the Heavy Vehicle Brake Code, Second Edition (Schedule 4) and it cannot be established what friction material was used (or the friction material originally used is no longer available).
The vehicle may be re-coded to its original brake code mass using an alternative friction material as long as no other alterations are made. This certification requires the original brake coding confirmed with an LT400 by an HVEK using the NZTA Brake Calculator.
A brake-coded heavy vehicle that has had a change of use, eg tractor to rigid (with or without tow connection) where there are no brake or wheelbase modifications.
If the HVEK certifier can demonstrate (using the NZTA Brake Calculator) continued compliance with the Brake Code as required by Section 8.1(4) of the Rule, then that original brake coding remains valid and is to be confirmed with an LT400.
A brake-coded HV that has had its braking system modified, even if its compliance curves remain within the ‘tramlines’ of the Brake Code.
The vehicle is outside its Brake Code certification and must be re-certified to Schedule 5 and issued an LT400.
Note: When an HVSC considers a modification ‘minor,’ they can apply for an exemption from the requirements of clause 8.1(4).
A heavy vehicle that has had its braking system modified in any way other than those specifically allowed by the vehicle’s manufacturer in their body builder’s manual. The braking system must be certified by a HVSC with the brakes category HVEK (or HVKD supported by a design certificate (DC) from an HVEK) and issued an LT400.
An air-operated spring parking brake that has been retrofitted to a vehicle to replace a wind-on parking brake must be certified by an HVSC with the brakes category HVEK.
Note: Provided the replacement spring brake chamber has the same service brake performance as the original and no other modification is made to the service brake, compliance to Schedule 5 is not required.
Standard compliant means a vehicle which, when it went through entry certification on or after 1-July-2008, was certified to one of the international standards approved in clause 2.5(2) of the Heavy-vehicle Brakes Rule, or, being a vehicle manufactured or modified in New Zealand after 1 March 2007, was certified to Schedule 5 of the Rule.
Original manufacturer means the state at manufacture, not the state after any subsequent modification/certification.
Page amended 1 October 2020 (see amendment details)
- 1 Vehicle Identification
- 2 External projections
- 3 Dimensions
- 4 Structure
- 5 Brakes
- 6 Occupant features
- 7 Vehicle dynamic performance
- 8 Equipment fitting
- 9 Towing connections
- 10 Load retention
- 11 Local manufacture and repair code of practice
- 12 Additional topics
- Technical bulletins
- 1 Heavy vehicle repair thresholds
- 2 Isuzu CXH450 chassis repairs and expectation for chassis repairs and certification
- 3 Heavy vehicle chassis ratings: modification thresholds to allow a heavy vehicle’s GVM to be altered (and its chassis rating to be changed)
- 4 Modification thresholds for the Heavy Vehicle Brakes Rule
- 5 HV manufacturer certifier (HMxD) use of design certificates for batch built or standard components
- 6 Certification of light vehicles towing heavy trailers
- 7 High Productivity and Overweight Permit attributes checks
- 8 SRT requirements for ‘O’ Permit Export/Import containers
- 9 Attributes sheet for HPMV/’O’ Permit
- 10 Welding in the transport industry 2013
- 11 Attributes sheet for 50MAX permit
- 12 SARN brake data
- 13 Stock crate certification
- 14 Lost or illegible identification plates for drawbars, drawbeams and towbars
- 15 Documents required for presentation to an inspecting organisation following HV specialist inspection and certification
- 16 Engineers’ responsibilities for modifications that may affect a heavy vehicle’s brakes
- 17 Heavy vehicle power pack upgrades to meet emissions requirements
- 18 Rebirthing
- 19 Tightening or reusing bolt-in tow eyes
- 20 Modifications to truck cabs