audi 100 5cy brakes

My Audi 100 is suffering from brake problems after a few miles the brakes
begin to bind. I did all the usual stuff ckeaing the calioers, cylinders etc
but still the same.
In a moment of frustration I hit the top of the Dash and the brakes released
only to bind again when I next used the brakes. the ABS light is in
continuusly .


Is there anything under the dash that could cause this problem if so what do
I do about it

Ian

T44 I assume.

ABS light: check the fuse in the top of the ABS relay in Aux Relay panel under
dash by your left knee. The decorative cover needs to be removed to get at it
and that is more of a job than it should be.

Brakes seizing: Very likely that your Master Cylinder needs replacing.
Test the MC by taking a bottle of cold water with you and when it seizes open
the hood and pour the water over the MC. If that releases the brakes you need a
new MC.

They go bad from excessive heat due to their location directly behind the
radiator fan.

Tony
'91 100q 5spd
4th T44 > BTDT

ian wrote:

> My Audi 100 is suffering from brake problems after a few miles the brakes
> begin to bind. I did all the usual stuff ckeaing the calioers, cylinders etc
> but still the same.
> In a moment of frustration I hit the top of the Dash and the brakes released
> only to bind again when I next used the brakes. the ABS light is in
> continuusly .
>
>
> Is there anything under the dash that could cause this problem if so what do
> I do about it
>
> Ian
>
>

Thanks I got too the relay panel without too much trouble and yes a fuse had
gone on the abs relay.

Next is to see if there is any difference in the driving which I doubt since
the hot master cylinder problem seem very likely. This car is an electrical
nightmare.the interior lights don't work the passenger seat wont move......
One other strange thing is the high beam light being on with dipped lights
and off with High lights.... that can wait for another day.

Thanks for the help
"ian" > wrote in message
m...
> My Audi 100 is suffering from brake problems after a few miles the
> brakes begin to bind. I did all the usual stuff ckeaing the calioers,
> cylinders etc but still the same.
> In a moment of frustration I hit the top of the Dash and the brakes
> released only to bind again when I next used the brakes. the ABS light
> is in continuusly .
>
>
> Is there anything under the dash that could cause this problem if so what
> do I do about it
>
> Ian
>

ian wrote:

> Thanks I got too the relay panel without too much trouble and yes a fuse had
> gone on the abs relay.
>
> Next is to see if there is any difference in the driving which I doubt since
> the hot master cylinder problem seem very likely.

You are probably right on that.

This car is an electrical
> nightmare.the interior lights don't work the passenger seat wont move......

To catch a lot of electrical gremlins on the T44s check and fix wires in two places:
- Wire bundle in the rubber accordion thingy in the drivers door hinge area.
This is a source of many problems. The wires don't stand up to flexing. Broken
and frayed wires. Check and fix them all with solder. It is also a good idea to
allow more length to reduce binding and to use Marine wire as is has more
strands for a given wire gage and withstands flexing better.
- Same sort of thing in the wire bundle as in enters the trunk hinge on the
drivers side. This causes problems in back and in the dash in addition to
blowing fuses.

> One other strange thing is the high beam light being on with dipped lights
> and off with High lights.... that can wait for another day.

Might be a switched wire from a previous owners failed attempt to fix something.
It might be an indication of the multifunction switch going bad. This is the
part behind the steering wheel with the levers. You don't even want to ask the
dealer what they want for a new one. Luckily they are fairly common in the bone
yards.

The problem is that audi designed the system so all the power to operate the
headlights goes through the high / low beam switch on the column. They used a
high quality switch but electrical contacts go bad over time. When the
resistance increases so does the heat and they finally melt.

The way to avoid this is to convert the system to relays so the column switch
only handles low power. Couple DPDT 40 amp relays and some 10 ga wire is all it
takes. Just tape the new relays behind the drivers side headlight and take power
from the 12 volt power source just behind the passenger side headlight.

This is one of the first things that I did with my current '91 100q so I
wouldn't have to deal with the problems in the switch. The side benefit is that
it also increases light output a bit as well.

>
> Thanks for the help
> "ian" > wrote in message
> m...
>
>>My Audi 100 is suffering from brake problems after a few miles the
>>brakes begin to bind. I did all the usual stuff ckeaing the calioers,
>>cylinders etc but still the same.
>>In a moment of frustration I hit the top of the Dash and the brakes
>>released only to bind again when I next used the brakes. the ABS light
>>is in continuusly .
>>
>>
>>Is there anything under the dash that could cause this problem if so what
>>do I do about it
>>
>>Ian
>>
>
>
>