Join Date: Apr 2014
Location: Fort Worth, TX
Drives: 2007 Hyundai Entourage, 2007 Kia Sedona, 2005 Infiniti Q45, 1971 Buick Centurion Convertible
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As an addendum to the post above:
After doing all that I previously described, I figured that the only other thing that could cause a "disappearing" brake pedal had to be the vacuum booster. Well, today I replaced that and guess what - NO DIFFERENCE in brake operation. I still have a "mushy/spongy/disappearing" brake pedal that is really dangerous to drive with. Also be aware that when I replaced the vacuum booster I checked the vacuum supply hose and check valve and they are working as they should.
So, I've now done everything that I, the Kia dealership that said my problem was with the ABS module and the independent shop that replaced the ABS module and kept the van for 2 weeks trying everything they thought of that might work, know to do. FYI - the independent shop had a scan tool that could read all the brake system parameters and could "auto bleed" the system. What it appears we've all come to realize is the van is basically "unrepairable" by mere mortals. Perhaps a Kia/Hundai vehicle braking system designer with all the time in the world, following the 143 pages of brake system diagnostics present in the 2006-2007 service manual might stumble on a solution but I don't know anyone like that. I suspect that the problem lies somewhere in one of several electronics modules but with no trouble codes triggered, how would a person know which one? What I'm experiencing with this Hyundai is unlike anything I've ever come across with the mostly domestic makes I've owned over the years.
Thus, I've come to the realization that I'm going to have to donate this vehicle to a charity for the tax writeoff with full disclose that I would not recommend it be driven in it's current condition. It's a real shame as the vehicle inside and out looks great and only has 95,000 miles on it. We've owned it for 10 years after purchasing it in 2008 with 8,500 miles and has up until recently been my wife's daily driver.
Realize, I'm not a novice when it comes to vehicles. We have a 1971 Buick Centurion convertible I've maintained for the past 43 years since it's purchase in 1975. I also maintain my wife's one-owner 1980 Datsun 280-ZX. Without ABS or Electronic Stability Control (and fuel injection in the case of the Buick) these vehicles are easy to keep operational.
I'll never purchase another Korean manufacturer vehicle again.