HONDA Insight - Manual (Page 35)

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While a typical cast iron drum might weigh 3.4 kg (7.5 lbs.), the Insight's aluminum/cast iron drum
weighs 2.1 kg (4.6 lbs.). The drum's outside diameter is 181 mm.
Anti-Lock Braking System
The Insight is equipped with a compact and lightweight ABS modulator assembly. The modulator unit
and ABS control unit are integrated into one component which also includes relays, wires and electrical
couplers.
During ABS function the IMA cuts battery regeneration (charging) to ensure there is adequate voltage
for ABS operation. After ABS operation has ceased, the IMA recommences battery regeneration
(charging).