FAT3 Glossary

Master cylinders that have two pistons that operate separate braking circuits, so if a leak develops in one circuit, the other circuit can still operate.

A raised or slightly bent corner on some engine bearing shells that fits into a matching recess in the bearing mounting surface. It keeps the bearing from rotating in the bore.

An internal thread-cutting tool.

A tool designed to hold taps securely for cutting internal threads.

An object that is smaller in diameter at one end.

A tap with a taper. It is usually the first of three taps used when cutting internal threads.

A type of wheel bearing with races and rollers that are tapered in such a manner that all the tapered angles meet at a common point, which allows them to roll freely and yet control thrust.

A type of lug nut, with a tapered end toward the rim, that helps center the wheel on the wheel studs.

Manufacturer-issued information about commonly found faults in a particular system and changes to repair procedures.

Satellite-based, two-way communication with the vehicle’s electronic systems.