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Mad Roger Mad Roger is offline
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Default Need help INTERPRETING these test results police cruiser SAE J866a Chase Test

On Mon, 15 Jan 2018 17:01:47 -0500,
Tekkie+AK4- wrote:

To Madman: When I was early in emergency services I used to run my private
vehicle. I had to pay attention to braking because after 3 stops there were
NO brakes.

I've never experienced such fade in my life, and I drive a performance car,
where I've driven down many a long hill. I don't know why I have never
experienced brake fade, but I know it exists. I just have never felt it.

But I've never put in less than FF pads either.

That may or may not be related - we can't tell. It's just a datum.

I got the police shoes because I was all into it.

What's a "police shoe"?

The police report from Michigan tested "regular" shoes only.

What a difference!

If there was a difference, it's hard to tell because nobody (except the
police in Michigan it seems) tests *new* pads against *new* pads (after

You probably didn't as nobody does.

You probably tested *old* pads against *new* pads, and even if you did test
apples to apples, it's not extensible to "my" car or to anyone else's car.

That's the problem with tiny experiments of a single datapoint.

When I got a pursuit certified vehicle it was wonderful.

What the heck is a "pursuit certified vehicle"?
I drove an EMT vehicle many times. It drove like a truck.

They are designed and built to endure punishment.

Like any performance vehicle on the road today?

Try and go to the dealer and
get the model, good luck with that.

Don't even know what it is.
Is it a souped up police cruiser?

Watch what happens on one of the police
shows. See which car is destroyed or smoking at the end.

That's not a good scientific test.

The actors can't
make the corner because they got no brakes. Or the engine expires. Something
is to be said when one goes from 0 to 40 then 40 to 0 repeatedly and sit
there idling for the next 1/2 hour then going to the next call. Then there
were the ambulances and fire trucks. *Training*

I have been trained to drive an ambulance.
Know what they taught me?

a. Defensive driving
b. Noise pollution is bad
c. Laws (nobody is allowed to break the law in that state, not even

I think in some states emergency vehicles *are* allowed to break the law,
but not in that state where I drove the ambulance. Of course, nobody is
going to give you a ticket either, but if you kill someone while breaking
the law, the onus is on you.