P-on

I got the Motive bleeder, but had trouble. I didn't know what pressure to pump it up to for brake bleeding,and went to 20psi max per the instructions. My old Wilwood 570 fluid leaked out of all the bleed nipples like an 80 year old with a prostate problem...very slowly. It took a long time to do a good bleeding. I also had some air in the hose going into the resevoir, but I don't think it mattered. Overall I get a better bleeding with my wife bitching at me as she pumps the pedal 3,000 times. Any help appreciated.

Bill Gregory

My C2 requires, per the factory, 2 bar or 30 psi. When I had my SC, I think I used more like 20-24 psi. I'd caution on having someone push the brake pedal to bleed older brake systems, unless you either have or want a new master cylinder. Foot stompin' bleeding pushes the master cylinder seals into parts of the master cylinder that don't normally see usage, which over time build up corrosion, which can rip the seals.

CPT Porsche

I have the Motive too, I'd say you need new bleeder nips.

Tom W

I can bleed my 993 using as little as 5-10 psi. I do like to let it go a bit slow (about 2 minutes per wheel) until the color change for the new fluid.

Air in the line to the resevoir should not matter. Are you sure there was no clog in the line from the bleeder to the resevoir?

Paul Conquest

I use a pressurizing device made from an old 2lb propane tank, cleaned out thoroughly, and then the valve adapted with a copper tube to force fluid from the bottom of the tank. The tank was free (outdated and therefore not refillable), and it cost me about $6 for brass fittings and $8 for a new master cylinder reservoir cap from the dealer.

I found 14 psi (1 bar) was ample for my '78 SC. The fluid floweda bit slower on a buddy's Boxster and my Ford Explorer, both of which have ABS. I thought this may be due to valves in the ABS.

The alternative of increasing pressure to speed the process has the potential adverse affect of stressing the plastic master cylinder reservoir, which is not designed to operate under any significant pressure. I made that mistake on my Explorer (increased pressure to about 30 psi or 2 bar), resulting in distinct light-colored stress marks around the neck of the reservoir. Making the same mistake on an expensive Porsche master cylinder would not be a good idea, so the 20 psi recommendation from Motive is probably a good one. As long as the fluid is flowing patience is the best solution.

P-on

I don't think it's the bleeder nipples, as that would mean all 8 were bad. I guess I just had my wife pressing harder than my Motive and I was comparing the two. Thanks for the help.