Does jacking with the parking brake on stress it?

[repo]

I'm probably overthinking this but I saw in the service manual it says to chock the wheels, release the parking brake, put in neutral before jacking. Does it put stress on the parking brake or transmission that much (assuming you're lifting the front)? What's the reasoning? So you can spin the rear wheels? It seems more dangerous that way because it's easy to forget to engage it again, you're relying only on the chocks.

 

[TechWrench]

I'm probably overthinking this but I saw in the service manual it says to chock the wheels, release the parking brake, put in neutral before jacking. Does it put stress on the parking brake or transmission that much (assuming you're lifting the front)? What's the reasoning? So you can spin the rear wheels? It seems more dangerous that way because it's easy to forget to engage it again, you're relying only on the chocks.

It would depend on what type of jack you are using. When you use a floor jack, as you lift the jack up, it tends to want to pull the vehicle toward it because of the swing of the lift part of the jack. This means either the vehicle has to roll to meet the jack, or the jack has to roll under the vehicle as it lifts it. If you do not have the vehicle in gear nor have the parking brake engaged, it is easy for the vehicle to roll into the jack as it lifts, so the jack stays stationary. If you have the vehicle in gear, or the parking brake engaged, then you are forcing the jack to roll further under the vehicle, and if the surface the jack sits on is not smooth and level, it can cause the jack to tip and possibly become unstable. This problem becomes painfully obvious if you are using a floor jack to lift one end of a vehicle when the other end is already
sitting on floor jacks. Because of the lifting and pulling motion of the floor jack, it will tend to rock the vehicle toward the jack and tip the floor jacks off of their flat resting point. Also not good. It is for this reason that chocks are always recommended when using a floor jack.

 

[2016 4Runner SR5]

You will not hurt a thing, don't worry about it. Just ALWAYS use jack stands before you get under the truck. Never get under there with the truck supported on the jack.