John Brett

John is a professional engineer with 50 years experience.

John has designed and built many cars, trucks, and vehicle assembly facilities.

John has worked on design of roads, bridges, cranes, transmission towers, and buildings, and operation, maintenance and upgrade of hydro and gas turbine power stations.

John was a LVV Certifier for 13 years. John has long been a whistle-blower, expressing the view that the LVV system is dangerously deficient. John’s authority was revoked in December 2012.

John rides a 1992 Yamaha FJ1200ABS, and is also a keen road and off road cyclist.


“The LVVTA has brought it to my attention that statements I have made in relation to it and its employees may have been perceived as defamatory.

I sincerely regret that and apologise for any harm caused. I have taken down the statements identified by the LVVTA of concern to it.

I have strong views about the low volume vehicle certification process and intend in the future to direct my energies into the public inquiry now being held in relation to it.”

John Brett 7th October 2015


1. Disclaimer

The opinions, beliefs and viewpoints expressed by the various authors and forum participants on this web site do not necessarily reflect the opinions, beliefs and viewpoints of the owners of this website or official policies of the owners of this website

2. Copyright Statement and Policy

A. The author of each article published on this web site owns his or her own words.
B. The articles on this web site may be freely redistributed in other media and non-commercial publications as long as the following conditions are met.
(i)    The redistributed article may not be abridged, edited or altered in any way without the express consent of the author.
(ii)   The redistributed article may not be sold for a profit or included in another media or publication that is sold for a profit without the express consent of the author.
(iii)    The articles on this web site may be included in a commercial publication or other media only if prior consent for republication is received from the author. The author may request compensation for republication for commercial uses.

3. Submissions

An article may be submitted for possible publication on this web site in the following manner.

A. Logging in an Author
B. The website owners reserve the right to approve or decline Authors.
C. Articles are published on this web site only on the condition that the author agrees to the terms of the Copyright Statement and Policy above.

Low Volume Vehicle Certification- Your Queries

We have been answering queries about LVV Certification ever since this website was started.
The queries and the replies are spread around a number of posts.

So just to make things easier to find- here are some of the pages which might already have the answer you are looking for, or where you can post a new query.

Classic Nissan (and good stuff on other makes)
Aarons Holden Ute
What a Maloo!
Wheels and Spacer
Seats and Seatbelts in a Van
Aftermarket Seats and Seatbelt Buckles
Road Test Requirements for LVV Certification
Motor Homes and Motor Caravans
Motor Home Warning
Disability Adaptions
Disability Adaptions 2
Electric Rav 4 (and other electric Vehicles)
Stretch Limousines
VW Kombi Stunt Van (don’t try this at home)
Vehicle Crash performance- Don’t try this either!
Police get red Card for Pink Stickers

Some PAGES which might be relevent- (note that pages do not allow comment)
About LVV Certification
Resource Page
Vehicle Design Consultancy

Some good sites which also might be of help are:

If none of the pages seem relevent to what you want-
Post your query here on this Post-
Just click on the heading “Low Volume Vehicle Certification- Your Queries” and you will see the box below for “Leave a Reply”
No need to sign in- just solve the ‘recaptcha’ puzzle which stops robot spammers.
Posts are moderated, so keep it decent, and keep on topic, or it won’t appear.

NOTE- ANYONE CAN ANSWER A QUERY!- We don’t pretend to know everything-

if you know what you are talking about, and can answer a query, jump right in!
Comments from other LVV Certifiers are MOST welcome.
If you are in business, and can help an enquirer, feel free to use the opportunity to promote what you do.



Posted by John Brett

24 comments to Low Volume Vehicle Certification- Your Queries

  • I definitely like your weblog and find nearly all of your post’s to be specifically what I’m searching for. Does 1 present guest writers to write content material offered for you? I wouldn’t thoughts writing a post or elaborating on the majority of the subjects you write concerning here. Once more, amazing weblog! Shop Pin

  • Andrew H

    Good Afternoon John;

    Was very impressed with your website.

    I am half way through restoring a 1969 Series 2A Landrover… and im up to the breaks. To convert to disk breaks I have replaced both front and rear complete hub to hub diff housings and put in ones out of a 1988 Ranger Rover. To do this I had to cut off all the old coil spring stuff, and weld on leaf spring mounting points. I got someone to professionally weld it and have a certificate of strength. The diffs are a slightly higer ratio, but still have the same mounting points and type as the old diffs so no changes to the drive shafts required. They are also slightly wider than the older diffs. The front one is also slightly offset (about an inch) to the left (ie the left wheel is a slightly different distance away from the center of the car compared to the right wheel). Do you think there would be any issues with certing all of that?

    My plan now is to self install a new break booster and master cylinder, and get new lines run professionally. What are the certifcation issues regarding running of the new lines any hiccups I should know about? There are two inputs on each of the front callipers so plan to run just one fixed line to each side with a T junction at the chassy to accommodate this.

    • johnbrett

      Hi Andrew
      This sounds like quite a complex conversion. What you have done sounds fine, and I can’t see any problem so far. Fitting a new master cylinder and booster seems straight forward, but
      1 Make sure the they are of a suitable size- e.g. similar to what the Range Rover would have had.
      2 Look into how the dual circuit system was set up on the Range Rover, and try to copy this. Some vehicles had two seperate circuits to both front brakes so that if one circuit failed, you still had two front and one rear brakes. If this is how the Range Rover Brakes were meant to be, better to keep them that way.
      3 Front to rear balance- I don’t think that there would be a proportioning valve on either vehicle, but check anyway. There MIGHT be a load proportioning valve on the Range Rover, this would be good to have if you can.

      Hope this helps


  • Chris Hyman

    hi, was wondering if anyone knows what the nz stardards are for building a motorbike frame from scratch? i’m a qualified welder so that shouldn’t be an issue just needto know if there are any guidelines i need to follow. Thanks

  • Al B

    Hey, a query on engine swaps. If my car was cat-equipped when it left the factory, is a cat required for certification if the engine that’s being swapped in was produced cat-less in the UK in 1989? If not, is the engine code enough to prove this, or will I need the rego plate of the donor car? Thanks.

    • johnbrett

      The LVV Rules say- Cat required if original car and the new engine had a cat. If one of them didn’t, you don’t need to have a Cat. Some NZ new japanese cars did NOT have a Cat, whereas same model used import DID. What car? What Engine?

  • Thomas Matthews

    Hi, I want to make a carbon fiber hardtop with some sort of poly carbonate window for my Mazda MX-5, am I going to run into any certification issues.

    • johnbrett

      Hi Thomas- I don’t think there is any need to Certify this- the only issue I can think of is making sure there is a label on a polycarbonate window for the benefit of the WOF inspector. Most suppliers will be able to cut the piece, and fit a label. Cheers John

  • Steve

    Hi, in the process of changing my power steering pump, can I use aeroquip power steering braided hoses, they are a ptfe hose listed only for power steering, however they are not a crimp design. I see Brake hoses are not permitted in the threaded nut design, thanks for your time, Steve.

    • johnbrett

      I do not believe that there is any specific rule for PS hoses, except ‘fit for purpose’. The hose you mention would seem to meet that requirement I think


  • Max

    Hi, I’ve just put some lowering springs in my prelude which brought some structural components below the 100mm threshold. I was wanting to know if there is anything I can do to raise it up approximately 20mm without requiring certing. I have read the lvvt threshold document which looks like it rules out spring spacers and remachining custom tophats, it that correct? I was also looking into making some shock spacers to sit between the top of the shock and the body of the car, would that require certifying? (similar to what is described on this site:


  • Max

    Thanks for the quick reply John. I would rather make a shock spacer for this as I have the resources to make a nice job of it and by doing it that way I can tune it to get the right amount of lift; I worry that resetting the spring might be a bit hit and miss. Are you saying that using a shock spacer would need certifying?
    Thanks again,

  • johnbrett

    Hi Max
    I wouldn’t have thought a spacer would need Certification
    The problem now is that LVVTA make all the decisions, and could disagree with me
    Note that I am no longer a LVV Certifier
    Your call, sorry

  • Peter

    Hi I own a Nissan Terrano R50. I have been given a dickie seat originally fitted in a Toyota Camry. Is it possible to fit this seat to my truck? Thanks

    • johnbrett

      If this is a seat made by “RETRO” you need to talk to them. Otherwise it would need to be LVV Certified, and that could be a problem for you.


  • Eric

    Hi John, maybe a little outside the scope but thought you’d be the man to ask, I have a truck with a modification declaration for a Chevy 350ci&th350, however this has been replaced with a 253 & trimatic. Will my vehicle require certification as a result? Thanks

    • johnbrett

      I believe that “Declarations” expired years ago, and were all replaced with Low Volume Vehicle Certifications. As far as I know, you will have to go through another Low Volume Vehicle Certification for this vehicle.
      Note that I am no longer a Low Volume Vehicle Certifier.



  • Yes, this is a good post without any doubt. You are actually doing a great job. I am inspired from you. So keep it up!

  • nino grahonja

    Hello John, I have a sidecar attached to a motorcycle, the sidecar is a velorex, The frame is tubular with a fibreglass body. I am in a wheelchair and need some funding from ACC to enable me to return to motorcycle. I need to cut the back of the fibreglass body to enable a wheelchair access. ACC require these modifications to be certified in order to get me financial support. Can you give me some advice on this project and circumstance?

    • johnbrett

      Hi Nino

      The legislation around Motorcycles and sidecars is vague to non-existent
      The best person to help is Alex Gee, who is a LVV Certifier specializing in motorbikes

      His phone No is 027 2647282 and email

      Best wishes


Leave a Reply

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>