Hi,
I have a set of AP3307 on my DC2R. The brake kit is old and hasnt been used for a few years.
I installed it on my car in Jan. and drove in the for a few months on the street with no problems...
Then before a track event last month, I bought new seals for a rebuild.
At the track, it started leaking....
My mechanic is saying it might be the pistons.... Or would it be something he messed up during the rebuild?

Any idea where to start looking?

 

Did you use new washers on both sides of the fitting where the brake hose connects to the caliper? Aside from that I'd suspect the rebuild or damage to the rubber lines while working with the calipers.

 

I will check the lines.
But I dont think the leaking is from there... Seems to be from the pistons.
Thanks.