# Braking delay

The **braking deceleration** , also **negative acceleration** , indicates how much a body is braked. The braking deceleration is given in the unit m / s².

The mean braking deceleration *a* of braking from speed *v* to zero with braking distance *s* is:

The mean deceleration of braking from speed *v _{2}* to speed

*v*with braking distance

_{1}*s*is:

Example: starting speed v _{2} = 20 m / s, remaining speed v _{1} = 10 m / s, braking distance s = 100 m:

The braking delay is z. Sometimes also given in fractions or multiples of the acceleration due to gravity .

## meaning

The braking deceleration is an important criterion for the safety of vehicles and ships and should be as high as possible. When spacecraft re- enters, however, it must not exceed certain values depending on the payload and thermal load.

## literature

- Heinz Burg, Andreas Moser (ed.):
*Handbook of traffic accident reconstruction.*Accident recording - vehicle dynamics - simulation, 3rd edition, Springer Verlag, Berlin / Heidelberg 2017, ISBN 978-3-658-16142-2 . - Horst Bauer:
*Driving safety systems.*2nd edition, Friedrich Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig 1998, ISBN 978-3-322-91815-4 . - Diedrich Lütjen, Manfred Müller:
*Automobile computing.*BG Teubner Verlag, Stuttgart 1984, ISBN 978-3-519-06721-4 .

## Web links

- List of typical braking delays of vehicles on different lanes
- Calculation of the stopping distance (accessed on November 16, 2017)
- Braking delays and induction of falls of motorcycles (accessed November 16, 2017)
- Brake deceleration and extrapolation (accessed on November 16, 2017)
- Interactive table that can be used to determine the initial speed, the brake track length or the final speed (collision speed) of a vehicle depending on the deceleration and braking threshold time - via juratexte.de .