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Jumbo brakes only came on ABS cars to the best of my knowledge, so they are all single piston.
The calipers, , caliper holding brackets, and pads for the Big brakes (11.25" diameter) are different from the Jumbo brakes.
To upgrade an ABS car (with big brakes) to Jumbo brakes you need calipers, caliper holding brackets, pads, and rotors. As per abe's instructions.
To upgrade a non-ABS car to Jumbo brakes, you need the same parts and two brake master cylinder plugs. You will be removing two brake lines and hoses.
Jumbo Girling brakes use the 1198 brake pad. The Girling brakes for both 11.25" (we call them the Big brakes) and 10.25 inch rotors take the 508 pad. ABS makes no diifference on the pad use for Girling 11.25" and 10.25" rotors.
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