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Home > Archive > Home Repair forum > July 2005 > Re: Car Brakes Squeaking
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Re: Car Brakes Squeaking
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| deans@wdeans.com 2005-07-24, 9:10 pm |
| > What kind of crap pads are $5 a wheel?
The same kind that comes on a brand new car rolling out of the factory.
AutoZone VALUCRAFT SEMI-METALLIC part number MKD215V with 1 year
warranty are the kind that I have on one of my own vehicles. Guess
what? They cost 9.99 for a set which does both front breaks. I also
believe that tap water is safe to drink and that I do not need to pay
up to $1 per bottle for water from a spring. My shoes do not have an
air pump so one day a Tiger might outrun me and eat me. I'll fly on
AirTran (ValueJet) to Atlanta. I guess I am just a stupid idiot.
Hopefully my healthy diet, exercise, and continued mental activity will
more than make up for it.
> telling someone who knows
> nothing about brakes to do their own brake job or change their own rotors
> is almost like giving them a loaded gun and telling them to pull the trigger
> while aiming at their loved ones.
You are right. If someone gave me a loaded gun and told me to pull the
trigger while aiming at my loved ones I would know just what to do with
that loaded gun after they handed it to me. I don't think our readers
are stupid. They can follow some steps and figure out what to do with
the break pads.
> Have you ever had brain surgery? Why not do it yourself? Do you know how
> much money you could save?
If I could learn how to do brain surgery myself in an hour following a
single page of steps and if I wasn't satisfied with the results I could
take the brain into a hospital to be reviewed and possibly redone by a
brain surgeon why not? Especially if the brain surgen looked like the
guy at Midas and didn't have a high school degree. Especially if I
also had an emergency brain I could call upon. Especially if the most
complex organ in the human body perhaps never to be fully understood
were as simple as break pads. Unfortunately this isn't at all what
brain surgery is like and so I prefer to leave it up to the
professional.
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| On Sat, 23 Jul 2005 20:42:39 -0400, "JerryL" <jlevine@adelphia.net>
wrote:
>
>"deans@wdeans.com" <William.Deans@gmail.com> wrote in message
>news:1122160340.906967.207920@o13g2000cwo.googlegroups.com...
>And I hope this helps. Any person that thinks the traction of their tires is
>stopping their car instead of the pads is an idiot.
The brakes slow the rotors, which slow the wheels. The tires, mounted
on the wheels, slow the vehicle due to friction created between the
tire surface and the road/driving surface.
If this is incorrect, please explain how the "pads" stop the vehicle.
DJ
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| DJ wrote:
> On Sat, 23 Jul 2005 20:42:39 -0400, "JerryL" <jlevine@adelphia.net>
> wrote:
>
>
>
>
> The brakes slow the rotors, which slow the wheels. The tires, mounted
> on the wheels, slow the vehicle due to friction created between the
> tire surface and the road/driving surface.
>
> If this is incorrect, please explain how the "pads" stop the vehicle.
>
> DJ
It looks like William is right about this. It seems that under normal
circumstances braking is limited by static friction between the tires
and the road, not by sliding or static friction between the pad and the
rotor. The coefficient of static friction between the road and the tire
determines a maximum torque that the brakes should apply to the wheel.
It would seem that ABSes increase the frictional forces between pads and
rotors until the wheels lock, then they let off so that the wheels
_don't_ lock up. Any pads can produce enough friction to lock the
wheels, so it is the tire traction that matters. Unless of course the
brakes overheat and begin to fade. I guess it doesn't matter unless you
might have to hurry down a tall mountain.
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| Matt wrote:
> DJ wrote:
>
>
>
> It looks like William is right about this. It seems that under normal
> circumstances braking is limited by static friction between the tires
> and the road, not by sliding or static friction between the pad and the
> rotor. The coefficient of static friction between the road and the tire
> determines a maximum torque that the brakes should apply to the wheel.
> It would seem that ABSes increase the frictional forces between pads and
> rotors until the wheels lock, then they let off so that the wheels
> _don't_ lock up. Any pads can produce enough friction to lock the
> wheels, so it is the tire traction that matters. Unless of course the
> brakes overheat and begin to fade. I guess it doesn't matter unless you
> might have to hurry down a tall mountain.
Uh oh. I think I may have to retract some of the above ...
The amount of sliding frictional force that can be developed between pad
and rotor depends on the materials. The maximum sliding torque will
differ. In other words some pads may cause the brakes to lock up and
the tires to skid at lower torques than other pads. Any pads can lock
up the wheels, but the better pads can keep the wheels turning while
applying large torques.
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