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Old 09-07-2014, 07:52 PM   #31
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Disc brake pads are always in touch with the rotor surface so technically, they are always rubbing.
The piston does not return inside the caliper.

Also, in some disc brake systems, the parking brake is not part of the disc brake system, They are small shoes located inside the disc rotor and are not in contact with the small drum area until they are applied. (Or at least should not be applied.) IT's a common system used on GM vehicles.
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Old 09-07-2014, 08:08 PM   #32
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Disc brake pads are always in touch with the rotor surface so technically, they are always rubbing.
The piston does not return inside the caliper.

Also, in some disc brake systems, the parking brake is not part of the disc brake system, They are small shoes located inside the disc rotor and are not in contact with the small drum area until they are applied. (Or at least should not be applied.) IT's a common system used on GM vehicles.


Actually the seals in the caliper pull the piston back in, this keeps pressure off the pads/rotors.

Another problem with the gm park brake in the trucks is that the shoes will vibrate around, ride on the drum and completely wear them out, shoes and drums, the best thing is to apply the park brake, let the vehicle "rest" on the park brake then shift to park. Saves your trans and park brake.
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Old 09-07-2014, 08:18 PM   #33
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Originally Posted by Ford Idaho View Post
I was up and over the hills out of Denver, Co. in June going to The Grand Canyon.

Slow down before you start down and let the engine hold as much as it will, downshift if you run a manual in tow/haul if equipped.

A light pressure on the brakes is better than a hard brake now and then, try and hold a speed you are comfortable with.
I am not sure how the tow/haul helps I this case. On my truck using tow/haul allows the engine RPM to built approximately 500 RPM higher than normal before it shifts into the next higher gear to take advantage of the torque in that RPM range. Going down hill the higher RPM would also apply. In my case going down hill in 4th or 5th gear I would rather have the engine trying to maintain 2000 RPM than 2500 RPM. At least that's the way I have been looking at it. Am I missing something?
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Old 09-07-2014, 08:24 PM   #34
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My experience has been that the seals no longer do a decent job of pulling the piston(s) back into the caliper so after a few thousand miles the pads are rubbing, very lightly, on the rotors.

As for the GM park brake design I mentioned, I have had them on quite a few GM vehicles and never had a problem, and never knew anyone who has. However, in my case it might be cause I constantly use the park brake when I park the vehicle. It's out of habit...as for others, not sure if they use the park brake or not.

I imagine some can have problems with them, while others don't.
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Old 09-07-2014, 11:05 PM   #35
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I need to pull the Allison manual out, but I seem to recall that when in tow/haul mode, a tap on the brake will also downshift the transmission.

After I clean my Beckett oil burner tomorrow I will dig it out and revisit all this.
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Old 09-09-2014, 01:15 PM   #36
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...Heat requires oxygen if the pads or shoes are in contact with the drum or rotors there is minimal O2 between them.....
Ummm....maybe you're thinking about a fire, which does require oxygen. Heat requires.....um....heat.
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Old 09-09-2014, 01:18 PM   #37
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Ummm....maybe you're thinking about a fire, which does require oxygen. Heat requires.....um....heat.
Um, friction?
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Old 09-09-2014, 01:27 PM   #38
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Um, friction?
..um...chemical reaction...um...radiation...ummm....anything, but it's does not require O2. Point made?
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Old 09-09-2014, 01:32 PM   #39
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..um...chemical reaction...um...radiation...ummm....anything, but it's does not require O2. Point made?
Agreed! But in the subject of the thread, only friction.
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