Mr Bob Asks
Where does the vacuum come from for power brakes on a car with a turbo charger? The turbo would be forcing air down the intakes throat so there would be no vacuum available.
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2021 Kia Sorento SX TGDI Took Delivery 12/11/2021
2021 Kia Sorento TGDI 2.5l 2.5K 6SP automatic AWD
2021 Kia Sorento TGDI 2.5l 2.5K 6SP automatic AWD
Vacuum pump is the source. Also note that there is a natural source of vacuum on a turbocharged car as well, and that's the intake pipe before the turbocharger (turbo sucks in air...that's the vacuum).
vacuum pump I think. Or hydraulic boost from the power steering pump.
Vacuum comes from the same source as on naturally aspirated engine. Vacuum line tap is downstream of a butterfly. There is a check valve in the line so there is some vacuum preserved when car is at fully open throttle.
Anyway, … there is no vacuum required for brakes when you are flat-footed. And when you lift, … throttle snaps and vacuum supply is pretty well instant, … turbo or not.
F.S.
And speaking of vacuum pumps: … modern naturally aspirated engines do require vacuum pumps (say, like Toyota’s A25A-FKS for example) because of a very wide operating VVT system. This results in no restricted air in the intake manifold at times, and so these engines do require a vacuum pumps. These pumps are driven off the exhaust cam shaft.
F.S.
Some provide brake boost via the ABS pump, some use a pressurized "bomb", some a conventional vacuum booster with a check valve. (Mine uses the latter. The vacuum booster is plumbed into the intake manifold.)
