Brake Balance

[Kurt Nolte]

My "daily driver" does about 90% of its braking with the rears, but it's 
not an Audi.

It's an '01 Optima Opus. ;)

-Kurt


Grant Lenahan wrote:
> 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
>>>
>>>       
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