hondadogie

I have a 2000 A6 2.7T with the Gerling 8 puck front brakes. I need new front brake discs and want to go aftermarket. Does anyone know for sure what the disc diameter is for the 8 puck Gerling front brakes, 320mm, 321mm?

SloopJohnB@mac.com

One mm is trivial. Only way to know for sure, BTW, is to look at the hub of your existing rotor and get the p/n.

Another issue is there were not Girling (sp) 8 puck front brakes. There are HP2 brake calipers with 4 pads per caliper.

Please show us a pic of these apocryphal 8 puck Gerling brakes…?

hondadogie

Harleyguy

Your old rotors should have the part # stamped into the metal on the raised center face. If they are older or rusted it may require some cleaning to read. The other variation is the amount that the center of the rotor offsets as there are different dimensions based on the type of caliper used. It should be a 321mm dia. Over-all height when laid flat on the rear face should be approx 53mm. (Think of the rotor as a top hat sitting brim down on a table then measure the height at the center hub hole; should read close to 53mm) I believe the Audi part number is 4B3615301. Some after market companies use the Audi numbers. Zimmerman is a good option that uses that number and fair priced from
Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips @ $74 ea.

massboykie

Hi

Some sites state 320 and others 321, but you will be fine with either as they are all the same I'm sure.

This may help getting the right ones as there are two types...

http://www.vaglinks.com/Docs/Audi/C5...artNumbers.pdf

Install info that may be helpful"
http://www.vaglinks.com/Docs/Audi/C5...akeSystems.pdf

Hope that helps

Cheers
Massboykie

Harleyguy

Probably don't need to mention this but I will anyway. When you change the brake components be sure all the mating and sliding surfaces are cleaned up. Remove all the corrosion, rust and gunk from the hub face where the rotor makes contact, the caliper mount pins that allow the calipers to "float", and the sliding surfaces where the pads sit. The previous owner of my car didn't do any of this and after less than 10k miles the pads and rotors were ruined. Also dab some anti-seize lubricant on the caliper pins, pad seats and and any of the other friction points on the assembly. Check out YouTube. There are a few videos there that show the whole process and will help a lot. Easier to visualize than a manual in some cases. I did the whole job in my garage in a little less than 2 hours, just using jack stands to support the car. Did one side at a time after jacking up the car, moving to the opposite side after the first was complete.