Bonnet releases from in the car, but second black catch is loose.

There is another lever at the front of the car that you need to release too. This is to prevent the hood flying open if you accidentally pull the release while driving. After you release the latch inside the car, go to the front of the car, near the Audi rings in the center of the grill there is a small black tab that pops out. Pull up on it and the hood will open. Let us know if that worked.

Do you mean bonnet release? If so loosen cable/wire by bonnet catch make sure it's free of any cable ties and clips, and is loose. Also inside vehicle try to remove any type of covering behind bonnet lever/handle, then undo any clips pins or nuts that hold handle in place. If you securely attach some wire or strong string to the end of the cable under the bonnet, and carefully pull it into the vehicle, disconnect old cable attach new, then pull it back into the engine compartment. Your cable should be in place ready for reattaching the lever, and bonnet catch.

1986 model has the bonnet release inside the footwell on the driver side. I'm referring to a right hand drive model, the level is on the right, and is black with a plastic housing to protect the carpet.

The safety catch after you've pulled the release is in the centre at the front of the bonnet. With your hand palm up put fingers in and under at about 45 degrees and you'll feel the lever which you need to lift while easing up the bonnet.

Hope this helps!

If the inside latch won't work, you'll have to reach up from underneath the hood to pull the lever over to open. Usually a flatblade screwdriver will help. The latch lever has to move towards driver's side to open.

get assistant to push down on bonnet whilst you pull the lever ,then once you pull back the lever and hold it back they try to lift it so it clicks up a bit then you open it by the safety catch

You don't specify whether its just that you can't find the release catch, or whether the release catch is stuck / broken,

In the UK (Right hand drive car) the release catch is situated in the left (passenger side) footwell, within about a foot of the lower front door hinge. In a Left Hand Drive car, I guess this would be reversed (i.e. right hand side footwell). Pull, and it semi releases the hood. Next, walk to the front of the car, pull the hood up about 1" and insert your fingers about a foot left of center. Sweep to the right, and you'll release the secondary catch and the hood will be open.

However, if its stuck / broken, then ......

You need to work underneath the front of the vehicle - the idea is to get at the catch and release it with a long screwdriver flicking the catch to open the bonnet -or getting a grip of the cable if it is hanging loose ( i.e. broken ) then getting a grip of the cable with mole grips or even pliers - to pull and release the cable / bonnet.

Once the bonnet is open - you can deal with renewing the cable assembly, or greasing it thoroughly.

REMOVED PANEL FROM UNDER THE BUMPER AND REACHED UP TO THE TOP OF BONNET AND LOCATED CABLE. PULLED ON CABLE WHILST 3RD PARTY PULLED BONNET LEVER IN DRIVERS FOOTWELL. BONNET RELEASED.

Have someone lift on the bonnet while you pull the release handle.

Get a second person to pull bonnet catch and you push up and down on the bonnet whilst catch is being pulled. 1, cable possibly stretched, 2, look at bonnet catch under the coloum to see if wire is attached, 3, try and lie under car and look up the back of the bulkhead to see the catch and release it manually. Hope that helps.

Most of the time the cable snaps at the release handle. If you remove the handle and get the end of the cable, you can cut off the cable jacket and use needle nose pliers or vise grips to grab the cable and pull to release bonnet.