In article >,
"Scott Ehardt" > wrote:

> > wrote in message
> ...
> > And if it had been front wheel drive?
>
> Isn't more braking power put to the front wheels of a car due to the weight
> distribution properties during stoping? I don't know the ratios, though.

Yup, the ratios are appx 85/15 for FWD and appx 60/40 for RWD

> > That's the rub with many of todays high powered vehicles. You have
> > antilock brakes that are made as small as they can get away with to
> > keep the weight down (and since they have antilock, it is hard to
> > overwork them anyway)
>
> How do you figure? Antilock does not help with heat tolerance or
> dissipation.
>
> > and now we have cars with more horsepower than
> > the old muscle cars. The power brakes are engine vacuum operated, and
> > the vacuum goes for a dump when the engine is under load.
>
> Yes, but you should still have pressure for at least a couple brake presses
> stored up in the system - same as if the engine stops while driving.

Correct, there is a vacuum check valve in the booster inlet that
should prevent the vacuum from dumping out when the engine is
under load. It usually takes between 8 and 10 (and sometimes
more) pedal pumps to deplete the stored vacuum in a brake booster
with the engine not running.