[s-cars] brakes assist failure

[Peter Golledge]

My 95 S6 booster failed by leaking internally so I lost most assist but 
the pedal didn't drop to the floor.  I'd go with the MC if the pedal 
drops to the floor its because the brake fluid bypasses the old/stiff 
seals.  Pumping manages to trap some fluid and get things going.

On 3/2/2011 3:08 PM, Konstantine Bogach wrote:
> Peter,  does pedal sag when booster goes bad?  Mine did.  I don't know 
> how booster work.  Doesn't it have seal like MC?   The symptoms look 
> like leaky seals:  a little braking until pedal drops to floor,  then 
> it returns and I can brake a little more.  I got home by pumping pedal 
> repeatedly at the its top position.
>
> Thank you.
> Konstantine
>
>  but if I press it to the floor I have little of brakes.  Very little.
> Does it
> On 3/2/2011 2:34 PM, Peter Golledge wrote:
>> If the booster is bad the brakes will require a LOT of effort but 
>> will work, if the MC is bad they typically "leak down"
>> as fluid goes by the seals.  You can also pull the MC off the booster 
>> and look for leaks.
>>
>> Had an MC go bu never had a booster fail on a Type 44, did have a 
>> booster failure on the 95.5 S6, what a freaking pain
>> to replace (and $$$ too!).
>>
>> Cheers
>>
>>
>> On 3/2/2011 11:03 AM, Konstantine Bogach wrote:
>>> Hi all,   how to figure out which part went bad - MC or booster?
>>> Patient is 200 tqa '89.
>>>
>>> Thank you.
>>> Konstantine
>>> S4 '93
>>> 200tqa '89
>>>
>>>
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>>
>>
>