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Question
chevrolet1616
2 years ago, I performed a GMT900 brake upgrade on my 2004 Silverado with 4 wheel discs. I've always had an odd "squishy" pedal feel ever since then. It was sorta firm but it never went back to what it was before. I assumed it was because the rotors I used were cheapos. However, a few weeks ago I checked the brakes by putting the brake pedal to the floor and pushing on the gas, the truck moved forward without hesitation. I tried this again on a gravel surface and it did the same thing. Previously I could get one or both of the rear tires to spin. This is a bit unnerving since I've driven 20k miles like this and not once has the ABS kicked on...
Either way, I believe the process to upgrade my brakes was the culprit towards weak brakes and squishy pedal feel. I began by replacing the rubber flex lines because of some deep cracking, with OEM replacements. However, I think in this process I may have let some air into the ABS module. Secondly, (because car makers are great with interchangeable parts), I ended up installing one caliper upside down, so the bleeding screw was down and proceeded to attempt to gravity bleed that caliper. I think the combination of changing the flex lines and putting a caliper on incorrectly initially, then attempting to gravity bleed it caused some air to get into the ABS module under the driver side seat on the frame rail.
I believe my next step is to bring it to a shop to use a scanner (TECH II?) to cycle the ABS module to remove any air in the valves inside the module? If that is the case, does anyone know how many hours a dealer will charge? or should I ask a shop to specifically perform this?
One thing to note, I will not perform the "backwoods" method of cycling the ABS module, by finding a road with loose surface and slamming on the brakes.
Thanks for any advice!
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