I think you'll find your brakes will be fine, compared with a standard 77 GLS. for eg.
You should already have GTI calipers with vented discs. Decent pads and good fluid will heap with feel/performance.
I think you'll have a mk 2 spec booster/MC assembly, but not 100% sure. The bigger booster will help improve "feel" but the MC will actually help braking performance.
Search for Pete Jones' series of write up on brake upgrades, plenty of great info there.
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