Discovery 2 brake rotors and pad options

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Originally Posted by Slunnie

Do they run bigger pistons in the calipers?

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If it isn't a typo, according to the TRW catalogue the pre 3A VIN # (ie ours) has the bigger piston?
48mm vs 45mm Catalogue

MC bore is the same on all VIN's

Quote:

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Originally Posted by rick130

If it isn't a typo, according to the TRW catalogue the pre 3A VIN # (ie ours) has the bigger piston?
48mm vs 45mm Catalogue

MC bore is the same on all VIN's

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Ahhhh, and just like that there is a front brake caliper upgrade. Same pads across the 2 caliper types AFAIK???

Legend, thank you!

dia 45mm = SA1590mm2
dia 48mm = SA1809mm2
increase in front clamping pressure = 13.7%?

The earlier D2 caliper has the bigger 48mm piston, so the clamping force is greater for it for a given line pressure.

Maybe there's too much flex in the big piston caliper?
Or they were trying to reduce pedal travel and increase pedal firmness in the later car?

Quote:

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Originally Posted by rick130

The earlier D2 caliper has the bigger 48mm piston, so the clamping force is greater for it for a given line pressure.

Maybe there's too much flex in the big piston caliper?
Or they were trying to reduce pedal travel and increase pedal firmness in the later car?

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Ahhh it went that way. They revised the brake booster at the same time.

Quote:

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Originally Posted by Slunnie

Ahhh it went that way. They revised the brake booster at the same time.

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Ahh ok, didn't realise that.