6. Suspensions


The purpose of a suspension is to ensure that all four tires (or more) are touching the ground at all times, ensuring proper friction so driving is safe, even in scenarios such as driving over potholes or uneven road surfaces. Before understanding suspensions and the various types of suspensions, it is important to understand tire alignment. There are four parts to wheel alignment. Camber will be explained first:


Understanding caster helps one understand why the tires straighten out after you let go of the steering wheel in a turn.


Toe is important depending on whether your car is front wheel drive, or rear wheel drive, as well as handling characteristics such as high speeds or heavy cornering.


Finally, steering axis inclination is utilized to minimize tire wear, by reducing the scrub radius of a tire.


And now the fun and interesting information: how suspensions work.


There are dozens (if not more) of different types of suspensions, and many auto manufacturers have their own variants of each. Some of the more common ones include MacPherson struts, double wishbone suspensions, and solid axles. Check out the videos below to learn about each and their unique advantages.


Two more suspension variants you may have heard of, which typically are used in higher end supercars and racing, include push-rod and pull-rod suspensions. Both work in a similar fashion. See the videos below to learn more about each.


We couldn't end this discussion with a small debate. The 2015 Mustang will supposedly incorporate an independent rear suspension. Is this the right move? Watch the video below and decide for yourself:


The next lesson will discuss brakes and safety systems, such as anti-lock brakes and stability control.

18 comments:

  1. Thanks for sharing your knowledge to many readers!

    Cloe from Brake O Rama

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  2. How Lower control arm of sedan car works & for Finite element analysis what is the boundary conditions, load conditions????

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  3. Oh now I know how the suspension of the car works. Good thing he mentioned some tips when buying a suspension, I will definitely keep this in mind when buying one.

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  4. if i wish to replace all 4 hubs,dampers and springs of ma old front wheeled car with , latest car.(Dihatsu Charrade G101 with Toyota Vitz 2008 model). what important steps should i follow to maintain a smooth and safe drive ? please advice me. Thank You.

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  5. I would argue on your statement re: toe-in. I think you mistake toe-out-on-turns with toe-in, two very different, but synchronized, settings. Toe-in, for many decades, was a setting designed to help prevent wear on tires, since the forward momentum of the vehicle, versus the friction of the tires, causes an outward, or "splaying" effect. By setting the toe IN, this counteracted the effect, allowing the tires to be "straight" when rolling. Toe in (or out) is the COMBINED setting of each tire, thus 1/16" left and 1/16" right = 1/8 toe-in.

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  6. You are Sweet.....

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  7. Much appreciation for these videos, Jason.

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  8. Hello sir,
    Can you explain torsion beam suspension?

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  9. U r super awesome!
    Can u plz do a design video for the same? As to how, step-by-step a double wishbone suspension is designed? (I know it's a lot to ask, but would really appreciate it if u could do it!)
    Keep up the good work! Thanx! :)

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  10. Can you explain about the level kit and lift kits? On trucks.

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  11. Thanks for sharing knowledge. Very ethic engineering!
    I would love to listing to a video on air suspension mechanism. I have QuadraLift suspension from Jeep. I know it is a closed system transfering air from a container to suspension elements, but how does it manage temperature variation (i.e. pressure variation) between hot summer and cold winter? How does it knows what is a leveled frame? What would happen if a leak on the system occurs?
    Thanks again for all your dedicated time to share your knowledge : )

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  12. I wish you could do a video on a Multi Link Suspension system

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  14. This comment has been removed by the author.

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  15. Can you do a video on Mc Laren's trick hydraulic suspension used in 12C, 650s etc.? I think the suspension is developed by a company named Tennecco!

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  16. La cuarta y última diferencia entre los replicas de relojes está representada por la manecilla de las horas, la cual, tal como la diferencia del minutero relojes de imitacion que se mencionó, tiene un relleno blanco en su diseño, mientras que la réplica es más replicas rolex simple sin ningún diseño en su interior.

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  17. You should explain why bigger heavier cars have better ride vs smaller lighter cars

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  18. For a FWD/AWD that typically understeers in corners, would rear sway bar still make the cornering better? Just feel like there might not be much power on the rear tires anyway so don't know if a rear sway bar would help.

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