Nine problems related to brake disc have been reported for the 1999 Audi A4. The most recently reported issues are listed below.
During wet weather braking, the front disc brakes seem to fail. The cars front end seems to slide to the left approximately 4 feet upon braking. This happens only in the rain, with no adverse effects during dry weather. I have contacted Audi, who then referred me to the dealership. The dealership has stated that Audi will not warranty the correction, since they do not know how widespread the problem is. However, I have noticed a large amount of complaints on your website, and on the Audiworld website. I submit that there is a defect in the front braking system of the A4 during wet weather driving, and that this defect could and will cause an accident. Even thought the car did stop, it required steering correction to put it back into the lane. The manufacturer should acknowledge that there is a defect and it should be covered by the manufacturer. If there is an accident, Audi will be held responsible and can be sure the reputation of their cars will suffer again. Please investigate this problem as it is potentially dangerous.
The brakes dont work is wet driving conditions. I have had this happen many time at speeds from 15 to 70 mph. When driving in the rain or on wet roads, I will apply the brakes but the car does not starting stopping for a second or two. When the brakes finally do start working they almost alway go into anti-lock mode because I have had to push so hard just to get them to work. This is a scary and dangerous problem and I have heard of other people having it also.
Wet disc brakes have no stopping ability for 1-2 seconds. Dry brakes function normally.
Wet weather braking very poor under certain conditions.
Wet braking 2/3 second delay of braking power when driving in rain at highway speed. Dt.
Poor wet weather braking - all times - about a 2 second delay before brakes grab.
When it rains, the brakes seem to take a second or two to "grab. " they work well under all dry conditions, but when wet, they sure make you panic!.
Severe delayed braking when road conditions are wet, raining, etc.
This model Audi has dangerous wet braking. When the brake pedal it pressed in the rain, the brakes do not respond for at least 2-3 seconds. This is extremely dangerous. My dealer (other from where I purchase the Audi) says this is normal, and nothing CA.