Sounds as you still have some air inside brake lines.
Also likely leak in vacuum line. Check connections and check valve at
booster and
at the engine. Leon
85 Subwagen Cruiseship

On Sat, 18 Jan 2003 19:56:29 -0500, Michael Brown <m_brown@COX.NET> wrote:

> I just got an 85 Vanagon.  The brakes would take 3 pumps to pump up, so I
> replaced the master cylinder.  After I replaced it, I bleed the brakes.
> Now when I push the brakes, I hear a hissing noise coming from the
> booster and still takes one pump to get a firm.  I pumped the brakes and
> held them down with the engine off, and when I turned the engine on the
> pedal depresses slightly and holds (bently test). When I turn the engine
> off, the hissing stops from the booster (holding the pedal down).  When I
> press the brake the rpms on the engine go up. I should also mention
> before I changed the cylinder and before I bleed the brakes, I did not
> notice the hissing sound.  The rotors, pads, drums, shoes, etc. are good
> and there is no break fluid leaking.  I would like to solve this
> tommorow.
>
> Does this mean the booster is bad?  Or is it a vacum leak somewhere?
> Could I have hit a vacum line or something when I changed the MC?  If it
> is a vacum leak, where/how do I go about finding it?  I have an 81 westy,
> is the booster the same as on a 85?
>
> Thanks,
>
> Mike
>
> 85 Vanagon
> 81 Westy
> 72 Westy
>
>

--
Leon