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Thank you for taking the time to share your feedback, and please accept our sincere apologies for the frustration and the extra downtime. We would like to clarify the fitment details and how the exchange price difference was calculated:
GM utilized two different front brake configurations depending on the truck's rear brake setup. The caliper set originally ordered is engineered for models with 4-Wheel Disc Brakes, whereas trucks equipped with Rear Drum Brakes require the front caliper assembly. Selecting the matching rear-brake specification note on the product page is required to ensure the correct front setup is matched.
Even though both systems share the same D1363-series front brake pad profile, the two caliper assemblies themselves are not identical. Beyond the bracket mounting hole spacing, the caliper designed for Rear Drum models features a larger casting and different piston bore specifications to balance the front-to-rear hydraulic braking bias, which carries a higher retail price than the standard set.
In your original order, the front ceramic brake pads were purchased at a discounted bundle add-on price tied specifically to the original caliper promotion. When the original caliper set is returned or exchanged outside of that bundle, the retained brake pads revert to their standard standalone price, which—combined with the higher retail cost of the Rear-Drum-spec caliper kit—accounted for the price difference during the exchange, while we covered the return shipping cost in full.
We also apologize for any inconvenience regarding the caliper-to-knuckle mounting bolts, which are reused from the factory hardware on the replacement kit. If there is anything further our team can do to assist you, please feel free to reach out to our customer service team directly.