2008 Toyota Tundra Owners Manual - Page 526
2008 Toyota Tundra Manual
Page 526 highlights
07 11.20 CAUTION Never turn off the engine to coast down hills. Your power steering and brake booster will not function without the engine running. Also, the emission control system operates properly only when the engine is running. 496 2008 TUNDRA from Apr. '08 Prod. (OM34477U)