Hi, Wallen.
> From: "Allen, Warren" <Warren.Allen@infores.com>
> Date: Sun, 9 Apr 2000 21:17:46 -0500
>
>
> Listers:
>
> Questions:
>
> 1. I tried to bleed my brakes today using my fancy new Mitivac, and I was
> disappointed. I'm looking to advice or commiseration. Here's the story: I
> attached the Mitivac to the bleed screw, pumped up pressure, opened up the
> bleed screw, and got only tiny quantities of brake fluid, mostly air. There
> was suction, but I'm theorizing that the suction couldn't pull the brake
> fluid. When I pumped the brake pedal. I was able to bleed the brakes
> normally. But the Mitivac wouldn't pull the fluid through the lines. Why
> not? Any successful or unsuccessful Mitivac stories out there?? Did I do
> something wrong?
The air bubbles that you see is probably entering around the bleed
screw threads. Wrap a little teflon tape around the outside of the
bleed screw after loosening it. The Mitivac should have no problem
pulling brake fluid [fluif] down then.
[sorry, no help on wheel brg adjustment]
> 3. Theory question: In the case of bleed screws, and brake line flare
> connections, these are metal-to-metal connections, and they don't leak. How
> can they not leak? Why is no gasket needed?
Metal is also elastic, just not as much so as other softer gaskets.
The metal-to-metal seal is stronger than a joint sealed with a more
compliant product (rubber or such) and that is important in
high-pressure systems.
Donald.
|