Toyota UA-LAC

[Grant Lenahan]

Did i read that right?

Some older audis have no vacuum booster on the hydraulic brakes?

They use something purely hydraulic? Like a pump?

Grant
On Jan 27, 2010, at 5:38 PM, Joshua Van Tol wrote:

> Also, there's vacuum depletion to consider. The first engagement of the
> brakes will have full assist, but each subsequent one will have less. That's
> why our turbo Audis have hydraulic assist.
> 
> On Wed, Jan 27, 2010 at 4:14 PM, Mark Rosenkrantz <speedracer.mark at gmail.com
>> wrote:
> 
>> By "meek," I take that to mean "dragging the brakes," more akin to a normal
>> (not panic/full ABS) stop.
>> 
>> Any average car has approximately 1200 HP worth of brakes.  Even with a 400
>> HP engine, you'll still have more than 1/2 the stopping force (800 HP).
>> 
>> The problem is that if you drag the brakes (even lightly) for an extended
>> period of time while troubleshooting, the brake pad material will start to
>> brake down, gassing out will occur, and the brake rotors can get heat
>> treated from the friction.  Anybody with overheated brakes on a race track
>> will know what this is like.
>> 
>> That said, ANY car can stop at least once with WOT from a high rate of
>> speed.... but you need full on braking force... try to engage the ABS
>> system.
>> 
>> It's a learning experience... no matter what your experience is, if you
>> drive a car, understand it's systems, limitations, and how to control it in
>> an emergency.
>> 
>> Just back from instructing,
>> Mark Rosenkrantz
>> 
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