Brake Balance

[Grant Lenahan]

Interesting.
I really dont drive either that hard ....

And obviously this rear balance cant be maintained under hard braking 
(since it would just lock the rears immediately and you wouldn't 
actually, well, stop)

So I am baffled by what they are doing in ABS 5.1. By the way, when did 
5.1 arrive (year?).

Later, gotta do REAL work :-)

Grant
On Jan 10, 2007, at 8:59 PM, Taka Mizutani wrote:

> Grant-
> I know that you're doing more like 80-90% of the braking in the front. 
> However,
> the initial brake drag on the rears is a characteristic of most 
> VW/Audi cars running
> Bosch 5.1 and newer, exactly how I described.
>
> If you "drive it like you stole it" all the time, then you would not 
> see this phenomenon,
> but I don't know too many people that do that.
>
> When you mention your S4 and S6, both of those cars have the 
> Lucas/Girling 4-pad,
> 2-piston caliper setup. I don't know how that factors in, all of the 
> cars I was talking about
> are single-piston setups. Maybe the cars with the big brakes act a 
> little differently.
>
> The brake proportioning is conducted via the ABS system, all the time- 
> at least that is
> my understanding of the system, although I could very well be wrong.
>
> I did not see anything like this on my 5ktq or 200q, both pre-5.1 
> systems. I have only noticed
> the high rear brake pad wear on VW/Audi cars with 5.1 or 5.3 ABS.
>
> I will have to see what comes of the V70R which also has a Bosch brake 
> system, I think-
> I haven't really been under the hood of that car very much. I know 
> that the front pads in
> the V70R were fairly worn in 19k miles, the rears look fine. Maybe 
> Volvo does not spec
> a calibration like VW. All 4 wheels dust an insane amount on the 
> Volvo, though, so the rears
> are definitely doing something even in everyday driving. Either that, 
> or having 4 piston brakes
> all around with huge rotors and pads simply makes a ton of dust.
>
> Taka
>
>
> On 1/10/07, Grant Lenahan <glenahan at vfemail.net> wrote:
>> but only up to a point. Read on.
>>
>> However, on more serious braking, ABS cannot do what you say and still
>> have the car brake effectively.  braking grip is proportinal to 
>> weight.
>> Weight in an Audi, on deceleration, will probably be 70% of more to 
>> the
>> front.  QED.
>>
>> Grant
>>