Toyota UA-LAC

[Cody Forbes]

Yeah, all type 44 Audis were hydraulic assist using the same pump as  
the power steering. UrS's, Coupes, and urQuattros too. Many BMWs of  
the 80's and 90's used a simmilar system, as did GM trucks. Citroën  
used the hydraulic suspension pump for steering and braking assist too  
on many models starting back in the 60's. I'm certain there are plenty  
of others.

-Cody (mobile)

On Jan 27, 2010, at 6:06 PM, Grant Lenahan <glenahan at vfemail.net> wrote:

> 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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>>
>
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