50% left on your brakes means that after driving 35,000 miles you used 50% of you brake pad lining so you should be able to go about 25,000 miles on whats left of your brake pads, You don't want to go too far with whats left because you take a chance of the pad backing hitting the Brake Rotor and that could be very expensive.

Barbara,
Brake pads should be replaced when they are at 15-20% remaining. Depending on where you live, what you drive and how you drive determines how long it will take to get to that point, so it's important to have them checked regularly.

youre gonna wanna learn a lot about german made cars if you dont know anything cuz you will double the price of the car if you ever take it to the stealership to fix it but they are very good cars ive got a 2000 a4 1.8T its a damn nice car but at that 75-80K mile range you need to make sure the timing belt has been changed it is the one major problem with these cars you can do it by your self for about $300 but if you dont know much about the car i wouldnt reccomend it. also make sure no CEL's are on when i got mine i needed a new MAF thats about $250 also dont hit anything i just hit a mail box and did $52000 worth of dammage...... but i get it back today:)

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audis are like strippers they only work when you throw money at them.

only get an audi if you can get a warranty

Well they are very respectable cars but if something should go wrong they are EXPENSIVE to fix.

changing the timing belt and water pump will cost you about $300 if you do it yourself it is easy from what ive read and seen you just need to take your time check out audiforums.com thats where i get all my info those guys are very helpful

Well the cost of a timing belt replacement and a water pump replacement will probably cost you around what the car is selling for...also, the Kelly Blue Book value of the car (assuming it is in excellent condition) is around $6k, so essentially you would be getting a good deal...

As far as replacing the belt and pump yourself, I wouldnt recommend it unless you are skilled and familiar with Audi's...it gets pretty complicated and involves taking the front bumper off and getting in there

An Audi with 124k miles on it will last you a good while, depending on its service history and your driving style, but it will be reliable...just a warning: usually above the 100k miles mark on most every car, parts start to go, so you may be faced with some moderate to heavy repairs etc. down the road

I would advise against it
i drive an 97 a4 and ive personally had to fix everything in the engine compartment except the engine itself "nice engine though"
Also parts for a 97 A4 are harder to come by though the fact that it is the AWD version brings some ease...
but with an AWD transmission at 124 your going to need to replace that soon...
ive spent almost $13 grand into OEM parts for my audi a4

well i must say Audi's are very reliable, but then again every car is reliable when maintained properly and driven correctly.
Now if the car has relatively low miles 30 to 40 thousand then i would have the parts replaced. but if it were high miles 80 thousand and up i would just keep looking for another car.
No as for replacing the parts your self that all depends if you have the right tools and experience in replacing car parts, not just your everyday do it your self oil change type.
Furthermore you are picking a good choice of car