# Braking force (technology)

internal name `braking-force-4` · tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md)) · upgrade
HTML page: https://factorio.kalzumeus.com/tech/braking-force-4/

## Cost

1400 units of (1 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 2 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 3 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 6 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 10 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 20 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 30 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 6 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 300 s each.

## Requires (1)

- [Braking force](https://factorio.kalzumeus.com/tech/braking-force-3.md)

## Leads to (1)

- [Braking force](https://factorio.kalzumeus.com/tech/braking-force-5.md)

## Unlocks (0 recipes)

Other effects: train-braking-force-bonus

None.