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Old 05-21-2015, 08:57 AM
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Brake Life & The Grand Cherokee WK2 ?

For you guys that have accrued some mileage on your Grand Cherokee's, I was wondering what kind of mileage your getting out of your brake pads, along with what type of driving you do? City stop and go, highway, towing, mountains, a combination, etc. It's a fairly heavy vehicle, and I was just wondering.

Also, Have any of you guys changed out the pads yourself, and how did it go? Speaking for myself, I've never turned a rotor in my life. In over 45 years of motorcycle ownership I've never found a need to either. Most motorcycle dealerships seem to agree, because when I had them do disk brake jobs on my various bikes through the years, they never turned or replaced a rotor either. It just isn't necessary. I'm beginning to think this is a racket brake shops are into for the buck. And when most do it, they cut way more than is actually required. Usually to be able to sell you new rotors because they purposely took them, "under the minimum".

I could see it if someone let their brakes go, and had the rivets gouge the disk from neglect. But under normal conditions I don't see the necessity of making the turning of rotors mandatory. Anyway, I was wondering if pad replacement is as easy as on most vehicles, or if there is something more involved?

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Old 05-21-2015, 09:20 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

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Originally Posted by billt View Post
For you guys that have accrued some mileage on your Grand Cherokee's, I was wondering what kind of mileage your getting out of your brake pads, along with what type of driving you do? City stop and go, highway, towing, mountains, a combination, etc. It's a fairly heavy vehicle, and I was just wondering.

Also, Have any of you guys changed out the pads yourself, and how did it go? Speaking for myself, I've never turned a rotor in my life. In over 45 years of motorcycle ownership I've never found a need to either. Most motorcycle dealerships seem to agree, because when I had them do disk brake jobs on my various bikes through the years, they never turned or replaced a rotor either. It just isn't necessary. I'm beginning to think this is a racket brake shops are into for the buck. And when most do it, they cut way more than is actually required. Usually to be able to sell you new rotors because they purposely took them, "under the minimum".

I could see it if someone let their brakes go, and had the rivets gouge the disk from neglect. But under normal conditions I don't see the necessity of making the turning of rotors mandatory. Anyway, I was wondering if pad replacement is as easy as on most vehicles, or if there is something more involved?
I agree it is a racket I have changed many a brake pad and if the they are not pulsating, making noise and if the surface is not scored then leave them alone and put your pads on I have never had an issue following that rule. rotors will go a long time before they get to thin and out of spec unless you start turning them unnecessarily and reducing the life. sometimes its necessary more often it isn't.
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Old 05-21-2015, 09:27 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

I've found through the years that after a pad change, if there is any excess noise coming off the brakes after installing new pads, several firm, hard applications of the brakes in a "pumping" application, will cause them to wear in quickly and erase any irregularities, and the noise will cease. After that your good to go.

I also have gotten into the habit of scoring up the rotor with some medium grit emery paper, (120 grit), mimicking the "cross hatch" pattern found on most new disks, cuts through any glaze, and improves and shortens the wear in process.
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Old 05-21-2015, 09:28 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

I've always replaced both at the same time. I'm not into rolling the dice when it comes to the safety of me and my passengers.
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Old 05-21-2015, 09:29 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

52000 miles and not even close to needing brakes. General rural driving and a lot of highway mileage. And I'm not one who uses the brakes hard (or the gas pedal, for that matter)...which makes them last longer. I get a lot more out of brakes and a gallon of fuel than my wife does, for example...we have different driving styles.
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Old 05-21-2015, 10:23 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

In the past, I've usually replaced the front rotors on the 2nd brake job, as they were approaching minimum thickness. That is a very general rule of thumb, as there are many factors that determine brake pad and disk wear.
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Old 05-21-2015, 10:38 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

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Originally Posted by silvermax04 View Post
I agree it is a racket I have changed many a brake pad and if the they are not pulsating, making noise and if the surface is not scored then leave them alone and put your pads on I have never had an issue following that rule.
Neither have I in almost 45 years of driving, and God knows how many miles.
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Old 05-21-2015, 11:07 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

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Originally Posted by Jim_in_PA View Post
52000 miles and not even close to needing brakes. General rural driving and a lot of highway mileage. And I'm not one who uses the brakes hard (or the gas pedal, for that matter)...which makes them last longer. I get a lot more out of brakes and a gallon of fuel than my wife does, for example...we have different driving styles.
Over the years I've gotten a lot lighter on the brake pedal and it does wonders for gas mileage. The idea is, the light is red ahead. Rather than roar up behind someone and stomp on the brakes, I start to slow down earlier so it often ends up with me not having to come to a full stop at all.

Not only does that save my brakes, but saves fuel by not having to accelerate from a full stop.

I always chuckle when following one of those guys that blasts away from every green light, then brakes hard at every red one. Almost every time, I'll roll up behind them as the light turns green and the cycle will start all over again. The difference is, my gas mileage, brakes, suspension and tires all go much further for me.

It's still too early to see how the brakes on my Jeep will fair, though. Unless something is defective or poorly designed, I've got a long way to go.
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Old 05-21-2015, 11:51 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

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Originally Posted by MOFSTEEL View Post
I've always replaced both at the same time. I'm not into rolling the dice when it comes to the safety of me and my passengers.
I agree. I always replace rotors now.

By the time the pads are done there is often some warp. And you definitely don't want to put new pads if there is any warp.

New pads should go on a fresh flat surface for the best braking and best miles out of the new pads.

It's not worth turning them because of labor costs and lack of skill around to do them right. And turning them won't fix warping.

On my prior GC 2002 I think I'd go around 70K miles per pads. 140k on one set of rotors is too long, mostly due to eventual warping.

Rotors are cheap enough and pads last long enough that it's not a lot of money in the big scheme of things.

It's really not a racket. Ever since asbestos pads went out rotors warp much easier. And since the volume on replacement rotors is now so high it's not that expensive to replace.

If there is no warping, you can roll the dice and sometimes you'll be ok. Sometimes not.
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Old 05-21-2015, 11:56 AM
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Re: Brake Life & The Grand Cherokee WK2 ?

Quote:
Originally Posted by NetworkTV View Post
Over the years I've gotten a lot lighter on the brake pedal and it does wonders for gas mileage. The idea is, the light is red ahead. Rather than roar up behind someone and stomp on the brakes, I start to slow down earlier so it often ends up with me not having to come to a full stop at all.

Not only does that save my brakes, but saves fuel by not having to accelerate from a full stop.

I always chuckle when following one of those guys that blasts away from every green light, then brakes hard at every red one. Almost every time, I'll roll up behind them as the light turns green and the cycle will start all over again. The difference is, my gas mileage, brakes, suspension and tires all go much further for me.

It's still too early to see how the brakes on my Jeep will fair, though. Unless something is defective or poorly designed, I've got a long way to go.
Me too. I try to avoid full stops by looking ahead. I also let off the gas real early on the highway before an exit.
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Old 05-21-2015, 12:24 PM
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Re: Brake Life & The Grand Cherokee WK2 ?

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Originally Posted by mswlogo View Post
Me too. I try to avoid full stops by looking ahead. I also let off the gas real early on the highway before an exit.
Technically, the highway is the one place not to do that sort of thing, but exit ramps don't always allow that to happen.

In reality, you should be pulling onto the exit lane at highway speed so as not to obstruct traffic. The same goes for entering the highway: you need to be up to highway speed before you enter the flow of traffic.

The problem is, in order to make every exit/entrance ramp long enough to accommodate that without hard braking or acceleration, the government would have to spend millions extra acquire land as well as build the extra lane length. However, this would potentially save money in road expansion and repairs that result from congestion and accidents that occur near exits and entrances.

It's the same reason I oppose truck lanes on hills. They never extend far enough over the crest of a hill for trucks to get back up to speed. The result is, they have to move back into traffic before they are back up to the speed of traffic.

The better system is to add a passing lane for faster traffic that would generally be smaller vehicles that can move in and out of the lane as needed. Then the trucks can simply remain in the right lane the entire way and you don't need extra lane length for them to speed up before merging.
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Old 05-21-2015, 04:46 PM
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Re: Brake Life & The Grand Cherokee WK2 ?

I have a 2012 Limited with V6 and 42,000 miles of mixed driving. My wife is hard on the brakes whereas I am not. I have not replaced any brake parts. I do not know the remaining pad thickness nor rotor thickness.

I can say that there are only two brands of vehicles that I owned that have not had warped rotors: My BMW's and this Jeep GC.
Every other vehicle that I have owned has seen warped rotors on a regular basis.
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