The Parking brake uses small shoes inside a drum which is part of the brake disc. I believe there has been a post on the forum with the brake system information. I just checked my book where I keep copies of files that have been posted by Squid, JT, etc. Parking brake is drum type.

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07 Tundra, slate metallic, regular cab, standard bed (6.5 ft. long) 5.7 engine, TRD dual exhaust, Steelcraft stainless step bars, Lund bug shield, Carriage Works billet grill insert, Weathertech vent visors, ScanGauge II, Code Alarm remote starter.