S4 Brake Master Cylinder Passage Blocked
Posted: Fri Jun 03, 2022 1:44 am
Hello Again,
I completed the restoration and rebuild of the brake master cylinder but when bench bleeding I was not getting any fluid out of the front most port. I disassembled the master cylinder and tried to blow air through the reservoir. I blocked off the rear hole of the reservoir so all the air would go through the front hole but no air will pass.
I can push a plastic tube down through the reservoir fill hole and into the hole in the front of the reservoir. The tube has some flexibility so I can feel it go down the passage a bit. I sprayed brake cleaner down the tube but nothing but clean fluid came up. I also pushed a plastic rod through the bore of the cylinder and into the hole at the end. The hole appears clear. But I don't have anything that can I can push through that will go all the way from cylinder to reservoir.
Has anyone experienced this before? I have it sitting with brake cleaner on either side of the passage to hopefully loosen what's in there.
I completed the restoration and rebuild of the brake master cylinder but when bench bleeding I was not getting any fluid out of the front most port. I disassembled the master cylinder and tried to blow air through the reservoir. I blocked off the rear hole of the reservoir so all the air would go through the front hole but no air will pass.
I can push a plastic tube down through the reservoir fill hole and into the hole in the front of the reservoir. The tube has some flexibility so I can feel it go down the passage a bit. I sprayed brake cleaner down the tube but nothing but clean fluid came up. I also pushed a plastic rod through the bore of the cylinder and into the hole at the end. The hole appears clear. But I don't have anything that can I can push through that will go all the way from cylinder to reservoir.
Has anyone experienced this before? I have it sitting with brake cleaner on either side of the passage to hopefully loosen what's in there.