[Vwdiesel] Rabbit Brake Booster alternatives?

[Roger Brown]

Doyt W. Echelberger wrote:
> My 84 Rabbit na diesel requires enormous pedal pressure to bring it to a 
> stop. I think it needs a vacuum pump and brake booster, one, the other, 
> or both.
> 
> Facts: I have good pads, rotors, and master cylinder.
> 
> I took off the vacuum pump and checked the diaphragm visually and tested 
> the pump ny spinning it, to prove it draws a vacuum. It isn't a very 
> strong vacuum, but I don't know what it is suppose to feel like when it 
> is working properly. No base line.
> 
> But the brakes are far more difficult to apply without it. It helps a 
> little bit.
> 
> The other unit involved is the brake booster (original).  I pulled a 
> vacuum on it and the vacuum didn't hold for more than a few seconds.  I 
> suspect a leaking brake booster.

My pump pulls something like 25" Hg vacuum when I checked it.
I do have the rotary pump, never checked the vacuum on my old '81 pump.
But you might pop the head off the pump and check the plastic check valves.
They can become damaged and you still get a little assist.

-- 
    Roger