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Discussion Starter #1
I just got my 2017 van back from my independent shop and a grand later had all new rear brakes. Caliper pistons were locked up on both sides and needed new discs and pads, of course. Is this a common problem on these vans? I'm pretty disgusted about such an early failure. I have also had the vehicle into the dealer because the trans was acting up. I first brought it in because the previous dealer was given 4 times to fix the Tire pressure monitoring system. 3 of the 4 sensor would stop reading at about the same time and mileage out each morning. Brought it into this second dealer and also had the recall done on the computer for the diesel. About 10 miles after getting the vehicle back, the trans started acting up and the speedo would bounce around. The speed would sometime goes up to 60 MPH when the vehicle wasn't even in gear yet. CEL on. The trans seems to be locked into a single gear. The problem would go away after driven for awhile and a couple restarts would turn off the CEL. TPMS system still isn't working properly.
The dealer said the computer flash can't have anything to do with the trans problems since they have seperate modules. I thought all the newer vehicles used a single computer to control everything, but they say that's not true. The dealership pulled the trans pan and no metal shavings, so the assumption is the problem is in the wiring.

If anyone had any insight as to where these problems are coming from, help would be appreciated.
 

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I have been through 1 set of brakes in 475,000 miles so I would say it has more to do with the salt and environment you live in. You have a ECM, TCM, BCM, etc controlling things. If it happened that soon after they touched it I would be looking at that. What was the recall ? Codes ?
 

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What state you live in? Brakes should have lasted longer, unless they rusted like mentioned.
 

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Discussion Starter #4
Yes we are in Chicago, but the amount of salt used on the roads is becoming less and less because the winters are now so much warmer than they used to be. Besides, the pistons were apparently locked up in the bores, so salt should be not be in there, especially with only 3 year old seals. I suspect that the brakes had bad seals from the factory.

The recall was an emission recall to reset some of the parameters in the computer. I would certainly start there....maybe there is a corrupt line of code. But they insist that's not the problem. A reflash would cost next to nothing and help rule that out. I believe they found that the speed sensor was overvoltaging sometimes, but could never get it to act up when they were testing.
 

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If there was bad seals from the factory you would have had issues much sooner. You have 3 salty Winters on it and that is hard on parts.
 

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Also make sure the transmission has the correct fluid. It seems to be picky what you put in it and does not like Dex 6. Mobil 1 Synthetic LV ATF HP is what GM started using in the Summer 2019.
 

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I'm still on stock calipers on my 2006 near Chicago. If the boot seals were on properly, the pistons shouldn't have siezed. Caliper bolts, perhaps....
 

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Discussion Starter #8
HI,

Trans Fluid is still original, except whatever they replaced when they pulled the pan. As to salt damage, My 98 escort probably had the original calipers when I sold it last year.... spent its whole life in northern IL. We've got a 2007 Jeep GC with 205,000 on it and I don't think its calipers have ever been replaced either, again its whole life in the Chicago area. Something must of been up with these brakes since it doesn't seem to be a common problem. Maybe someone with a newer model will weigh in to see if its a problem on newer models. The discs where pretty clean.. no pitting on braking surfaces on the outsides, I believe they were torn up on the insides, however. from dragging.
 

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GM used the same calipers from 2003-2017. What was the condition of the brake fluid ?
 

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Discussion Starter #10
Turboawd it's good to hear that someone in a similar environment is getting lots of years out of thier rear calipers.

I don't know... my shop did the work. Again 3 yrs, 38,000 miles the fluid shouldn't of been that bad.
 

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Maybe at some point in 3 years the fluid became contaminated ? Maybe 1 time in 3 years it happened to get packed with salty snow and sat for a while accelerating the corrosion process ? A lot can happen in 3 years. At least now you can pay closer attention to the rears to see if you can catch the issue early if it happens again. I drive more than the average person and do all my own work so I try to constantly eyeball everything in hopes of catching potential problems early.
 

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First, I really dont think the pistons were froze, rusted, in their bore. My money is on the slide pins being rusted solid in place. Went through that on a 40k mile 2000 2500NBS, at 1.5 years old.
 
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The brake shop made about $600 on labor, if they installed new calipers, rotors and pads. Caliper seizure is not typical at all, even in Chicago that should have lasted more than 38k miles. Unless van was parked in salt slush for months at a time? How much do you trust your shop?
TPMS sensors in wheels typically last 7 years before the battery goes empty and they need replaced. The sensors are $10 a piece on eBay plus mount/dismount labor. ANY hole-in-the-wall tire shop can replace them. TPMS is not tied to anything else in the van so is unrelated to other issues of yours.
ECU calibration recall is typical as well.
The moving speedometer isn't at all typical for these vans, I have never seen this before. Must be an issue related to the programming in the 2.8 diesel or 8L90 trans.
The #1 item you can do to help us help you is to provide actual DTCs (trouble codes). If the trans is stuck in single gear, there must be codes present. Does it manual shift in M?
Get yourself a "ELM327 mini bluetooth" adapter for $10 from Amazon and connect it to the $5 Torque Pro app on any Android phone and you'll be able to read/clear codes and see other engine data.
 

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Did my rear brakes today and found one of my caliper pins stuck. Had to pound it out. I was able to clean it up, grease, and reuse.
Like mentioned, maybe they replaced the caliper bracket and not the caliper itself if the pin got seized.
 
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