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Old 01-11-2013, 01:06 PM
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dragging Caliper?

im wondering if i have a dragging caliper, or some other sort of brake issue going on. my 3.7 WK gets Horrible gas mileage, 7.9mpg on a good day, its all city driving so i dont expect great number, but this is pathetic.

this is what makes me think something is dragging: when i cruise along, if i let my foot off the gas, the jeep doesnt seem to coast,like it used to, the decrease in speed is pretty rapid. not instant, but the speed drops noticeably, where as previously i never noticed this happening....

Is this even something that has happened on anyone else's car? Am i just noticing something that inst really there? I Changed my plugs recently because i figured the old one were shot, but there was no change in mpg, oil change, filter changes, as well and no help.

i used to get on the highway with the car even for a 20mi trip and see the mpg computer go up to 12 and i was satisfied with that.

i searched but didn't find anything definitive.

thanks for any advice.
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Old 01-11-2013, 01:18 PM
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Re: dragging Caliper?

If you don't have a floor jack, an easy way to check is run it on the highway so no brakes are applied for some time, then pull off and immediatley feel the wheels. The one that is super hot is the one with the dragging caliper. I get 22 HWY, 13 city with my Hemi; hit reset when you hit the Hwy to get an accurate reading.
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Old 01-11-2013, 01:21 PM
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Re: dragging Caliper?

Quote:
Originally Posted by dmsfun View Post
If you don't have a floor jack, an easy way to check is run it on the highway so no brakes are applied for some time, then pull off and immediatley feel the wheels. The one that is super hot is the one with the dragging caliper. I get 22 HWY, 13 city with my Hemi; hit reset when you hit the Hwy to get an accurate reading.

ill have to check this out and see if i can find the culprit.

i read this post :
when coasting very sluggish not smooth deacceleration

but they seemed to come to the conclusion that its just due to adaptive driving conditions.... but i cant see how that would make the car slow down faster. all that would do is just not make the engine work as hard, not actively slow the car.
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Old 01-11-2013, 03:08 PM
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Re: dragging Caliper?

The adaptives certainly can change the way the car slows down primarily by changing when the vehicle shifts down and/or engages the torque converter. Basically, you may be slowing through engine braking...

dmsfun is right on the money with checking for excessive heat at the discs. You should certainly feel one side warmer than the other if there is a stuck caliper.

As an aside, even with a dragging caliper, I wouldn't expect gas mileage that low...I suspect something else may be the root cause.
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Old 01-13-2013, 07:22 PM
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Re: dragging Caliper?

do you ever let it idle... if its cold do you let it sit and warm up? because your EVIC MPG will drop dramatically if you let the car sit and idle even 20 minutes makes a big impact.
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Old 01-17-2013, 08:18 AM
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Quote:
Originally Posted by 2005JGC View Post
do you ever let it idle... if its cold do you let it sit and warm up? because your EVIC MPG will drop dramatically if you let the car sit and idle even 20 minutes makes a big impact.
My mother drives mostly so this could be a factor. She also drives like a little old lady...
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