2012 Lexus LFA Owners Manual - Page 466

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Brake caliper

The LFA features front 6-piston and rear

4-piston aluminum alloy monoblock

calipers with differential piston bore

sizing. This design takes advantage of

what is known as the 'self-servo effect',

allowing pressure from the unequally

sized pistons to push the pad against the

rotor in a progressive pattern, with the

leading piston applying the least force

and the trailing edge applying the most.

This wedge shape uses the rotational

movement of the disc to help the brake

pads 'bite' into the disc with more

effective pressure distribution, optimized

pressure equalization that helps realize

a more consistent supply of stopping

power. The LFA also features track-bred brake cooling ducts in the front bumper and

aerodynamic under covers designed to channel fresh, cool air to the brake system.

Each brake caliper piston (Front: 12

Rear: 8) employs a thermally insulated

aluminum construction with cooling

holes to help prevent the brake ±uid from

boiling for enhanced high-temperature

endurance.

Parking brake calipers have been adopted

in order to lower vehicle weight. A switch-

operated EPB (Electric Parking Brake)

function has been adopted.

1.50 in. (38 mm)

1.26 in. (32 mm)

1.10 in. (28 mm)

1.10 in.

(28 mm)

1.18 in.

(30 mm)

Front brake caliper

Rear brake caliper

Aluminum brake caliper

piston

Thermally insulated

construction with

cooling holes

Brake pad side

The shape of the cooling ducts in the

front bumper and contours of the under

covers have been designed to direct

cool air directly at the brake discs.