brake question

[SonomaPete]

I just replaced the master cylinder and brake lines on my 69 911E. I'm now using a new pressure bleeder to bleed the brake lines. however, I can't build pressure on the bleeder. pressure builds when I hold the cap against my hand and pump, but when I screw it to the reservoir and pump 20-30 times, no pressure builds. the speed bleeder cap appears to screw tightly to the fluid reservoir (checked for leaks with a little soapy water on the outside), and there's no evidence of brake fluid leaking from any of the lines / bleeder valves (I just installed speed bleeders fwiw). bottom line -- I'm stumped. any suggestions?

[dandrews64]

I'm no expert (far from it) but my Bently manual covering my '82SC shows a step to clamp off the overflow tube on the reservoir - if '69's have one, you would lose pressure there.

I'll be bleeding mine this weekend (new calipers) so interested to see what you find out here......

[dweymer]

I tried to bleed my 74, and found my overflow tube works, after pumping about .5 qt onto my floor. It leaves the reservoir and runs forward by the battery. My 67's resevoir was in the smuglers box though so I'm not sure where your tube would be, but thats probably the issue.

[ljp911]

Take a look around the top of your brake fluid reservoir and you shoud find a tygon tube exiting the rear around the top. It will be routed down below the car to vent. It will need to be clamped off to allow the pressure style bleeders to work. The tube may be old and brittle and need replacing or may also leak around the nipple on the reservoir. It helps to use the minimum pressure that will push the fluid through the lines rather than the full pressure recommended on these cars.

[coloradoporsche]

I did the same thing as Don. I'm still cleaning brake fluid up a month later. At least it's not corrosive or anything...doh!

[SonomaPete]

awesome, thanks everyone for the advice... will track this down and give it a try.