At the manufacturers I have worked for, we had test tracks just outside the assembly building. On the test track was a short, BUT VERY STEEP hill. Way steeper than you ever experience on the street. There are various markings on the hill.
Part of the check the test drivers do is to go up the hill check the service brakes on the steep part, move up further at some point before it levels off, there is some markings. It is still steep there, just not as much. Then, with it still in gear and holding the brakes, they count up some specified number of park brake clicks. Then, they let off the service brakes and put the car in Neutral. It is supposed to hold the car at that specified number of clicks.
Toyota was specific because they wanted each parking brake to feel the same car-to-car. My guess is that Mitsubishi has the same or similar specification and check. Now, as to how adamant they are to adhere to it, I couldn't say. It would be nice to know that spec.
But at least, I could check the number of clicks it takes on my car. I have a slight incline in my driveway. Nothing major, but it would hit maybe 15-20 mph coasting down the whole length. I'll try to remember to count the clicks.
But my car is new. There will be some wear on an older car. But it shouldn't be more than 1 or 2 more clicks ... but then again, I'm not sure how the drum brakes work for parking, versus disk brakes.
In any event, I hold the button when I pull the brake lever up. Because if you are standing outside someone's car, and hear this parking brake being lifted and clicking, it sounds like the car pulls into a parking space, and farts (from the clicking of the park brake, it really sounds like a car fart). I don't want my car to sound like it is farting, so I hold the button, and let off when there's enough pressure. No farting that way.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)