Re: Brake bleeding - pressure or vaccuum?

[Porsray@aol.com]

I vote for pressure bleedig : was never able to get anywhere with vacuum
bleeding on two Porsches except a sore, blistered hand.  Pressure bleed
setup I mad up works great.

Parts are:
    - Spare reservoir cap
    - Metal (bolt-in) tire valve
    - Air tank with clamp-on tire hose
    - Small air compressor to pressurize tank
    - Clear tubing (approx. 3 ft.) 
    - Old empty clear plastic soda bottle (16 oz. is fine), filled ~1" w/old
fluid

Take guts out of valve, then cut a hole in reservoir cap same diameter as tre
valve threaded portion.  Mount valve in cap stem up.

To bleed, remove present reservoir cap, pull out as much old filter as you
can 
with turkey baster and fill with fresh fluid.  Screw on valve/cap
combination, 
and seal/clamp off any overflow or vent hose.  Pressurize the tank to approx.

20 psi.  Now jack up the right rear  and remove the tire.  Press one end of 
the tubing over the bleed screw, submerge the other end in the bottle with
brake fluid.

Connect the air hose from the tank to the valve/cap and clamp in place. Now
go to the brake caliper and open the bleed screw; all the nasty old fluid
will be forced out  via air pressure.  Stop when have no bubbles in turbing 
line and fluid is comiing out clean (approx. 4-8 oz.).  Close bleed screw, 
disconnect air hose,  remove cap/valve assembly, refill reservoir, then go to
the next wheel ( left rear).

I have used this method successfully  on an '84 Porsche Carrera (Turbo 
brakes),  '90 Coupe Quattro, and '95 Porsche 993 (w/ ABS and traction 
control, another set of brake line/valves/pistons to bleed).

Ray Calvo (porsray@aol.com)




In a message dated 96-08-03 12:22:30 EDT, you write:

<< 
 From: rpp <75313.1445@CompuServe.COM>
 Date: 03 Aug 96 05:37:22 EDT
 Subject: Brake bleeding - pressure or vaccuum?
 
 Hello again,.
 
 I can't decide what apparatus to purchase.  A pressure bleeding setup or
vacuum.
 Suggestions welcome, and please include part numbers.  I don't need extreme
 speed so I'm leaning towards vacuum, also I don't have a compressor for air.
 
 BTW, this would be for multiple cars - all w/ABS and all European.
 
 TIA
 
 Randy....
 
  >>