Clark

If you know you are loosing brake fluid, you should be able to find out
where. Put the truck somewhere and keep pressure on the brake pedal, or get
something that will do that for you, and check for leaks. You might put
cardboard under the truck or some other material that will show up the
leaks. If you are loosing fluid, and you say you are, the break pressure is
probably being bled off through the leak.

As the previous poster mentioned, the leak might be somewhere hard to see,
or in an area that is already wet so it is hard to see. I don't remember if
you said you had bled the brakes, old fluid may have moisture and needs to
be replaced. The last time I replaced a master cylinder was when I wasn't
loosing fluid, but I could put the pedal to the floor. The fluid was
leaking around the seals internally and loosing pressure.

You may also have a combination problem, where you are loosing some fluid,
but another component is failing and aggravating the situation.

Clark

"kevin" <kevnospam242@gmail.com> wrote in message
news:96evs15pucugaem4f191gkscardvlt45j8@4ax.com...

> On Mon, 9 Jan 2006 18:30:22 -0500, "Joe S." <anon@mous.com> wrote:
> I cant seem to find the ABS pump, however I am losing brake fluid. I
> replaced the fluid and still the truck's brakes are dangerously poor.
> There aren't any visible signs of leakage (puddles etc..) so I've come
> to the conclusion it must be the master cynlinder. There are still
> some other things I need to check to make sure (including the ABS
> pump) before I try to replace the master cynlinder and any advice
> anyone might have is definetly appreciated.
>
> One good thing, according to NAPA a rebuilt master cylinder
> (w/lifetime warranty) is about $50, so at least money wise I may luck
> out.
>
>
>
>