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These are probably the oldest type of suspension, and consist of steel strips in a bow formation. They should be more “u” shaped than flat or “n” shaped, like shown. we’ll need to know many “leaves” you have got.
These are cheap, compact, and allow a lower rear floor, making them a very common choice for the rear suspension of a motorhomes. However, when overloaded they can be too close to the chassis of the vehicle, and the suspension compressed to such a degree that you’re effectively riding on the bump stops (the rubber blocks that prevent metal clashing with metal). Not only is this a MOT fail, but it means that your vehicle lacks the compliance over bumps in the road which can lead to a catastrophic failure of the body structure. We’ll need photos showing this distance (and a note on whether the vehicle is loaded or not).
Almost every passenger vehicle on the planet features McPherson strut front suspension, being a coiled spring (usually wrapped around a damper). It’s cheap, robust, versatile, easily serviced, and handles whatever most roads can throw at them. However as they are much more tailored to each vehicle they can be far more expensive and complex to upgrade should you have overloaded the front axle. If you’ve been smart (or had guidance from us early on in your conversion) you’ll be trying to keep all of your additional weight to the rear axle, so hopefully we won’t need to be changing these. We’ll need photos of them either way.
Originally the preserve of luxury cars like Rolls-Royce, these have now become popular on 44 tonne HGVs and increasingly found on campervans and motorhomes. Chances are if you’ve already got a set of these installed you are already equipped for increase weight, but we will still need to check on their specification and weight rating. These are a common addition to existing suspension set-ups to give additional load carrying capability.
Almost all vehicles have disc brakes at the front, we need the diameter of them, the thickness of the disc, and is it ventilated or solid (does it look like it’s made out of two layers, like a custard cream or is it solid like a digestive?) This is usually easier if you turn your steering wheel hard to one side and are able to reach around behind the wheel.
You’re all done with the climbing around under your vehicle, you’ve done a brilliant job, and saved yourself a lot of time and money bringing your vehicle for an inspection. You’ve earned yourself a brew and a biscuit (weirdly we’ve now got a hankering for a custard cream or a digestive…)