Brake bleed valve seat....calling all brake gurus Options

[raynekat]

Just trying to get an answer over the weekend to a question I have.

I've got some new rear calipers going on the car and one of them is weeping some brake fluid.
Hard to see exactly where it is coming from.
Could be a bleeder valve or possibly a defect in the caliper casting.

I have a question about the brake bleed nipple seat.....actually the very bottom where the end of the bleed valve bottoms out.

See pic below:



To me, the correct bottom of the bleed valve seat should be beveled to match the beveled point at the end of the bleed valve....such as the example on the right.

My particular caliper has a seat bottom that is square like the example on the left.
Not only do you get less surface area for the bleed valve to seat against possibly causing a leak even when the bleed valve is closed or tightened up....but if you tighten the bleed valve even a moderate amount, the square bottom will put a nice "step" in the bevel of your bleed valve.
I don't believe that is an optimal situation or even wanted.

Any thoughts or knowledge on this?
I'm thinking I have an incorrectly machined bleed valve seat.
I was thinking about taking a proper sized drill bit and putting a bevel down there, but the angle is not the same on the drill bit.

On Monday I'll check with Eric at PMB for his take on this.