hulbyw wrote:Thanks guys for all your advice. When I pulled the caliper off and checked the tapered seat that the bleeder screw seals against, the seat has been damaged (looks like I have been way too heavy handed when bleeding the brakes in the past- very red face) . Brake specialist reckons it is highly unlikely that the seat can be repaired and there is not enough meat around the caliper to bore the hole out , recut the seat and rethread it for a bigger bleeder. One guy did have a solution that I reckon would probably work. He said to cut off the tip of the old bleeder screw then assemble it with a ball bearing between the cut off bleeder end and the caliper seat. Probably crude but effective however I really want the brakes to be spot on, so I have given up stuffing around and ordered new ATE calipers. Expensive option but the car really needs to be back on the road. Hate having my VW gathering dust!
As silly as it sounds some Mazdas used the flat bleeder with a ball bearing in some models,they were a bugger if you opened the bleeder too far as the ball fell down out of the aperture.