There is no handbrake fluid as such
It suggests if the handbrake is really light then the handbrake is already stuck on
You may need to jack the back of your car up, take the handbrake off, then try spinning the back wheel and see if it moves freely
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold