ASE Engine Repair
Terms & Definitions
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DOT
A magnetic, hall effect, optical or magneto resistive sensor usually mounted internally in the engine, externally to the engine are in the distributor to inform the ECM or PCM of the crankshaft position location of No. 1 piston, and crankshaft speed for ignition timing and other calculationneeded by the system where RPM is in input.
Friction material it is bonded or riveted to curved metal structures attached to the backing plate. The brake shoes press on the brake drums to stop its rotation.
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Component in the EGR system, used to meter a controlled amount of exhaust gas into the intake air stream.