I never seem to see master cylinders with bleed screws in them anymore and I was curious, what is keeping a person from adding one?
Motivation: the S2000 is nearly impossible to bench bleed the clutch master cylinder because unlike a brake master cylinder, all of the fluid rapidly runs out as soon as you unscrew the port to plug it into the line. Usually you could plug the line in quickly, but my large Caucasian hands can't do it in the tiny space up by the firewall :/
Just install the m/cylinder and bleed in the car by using the brake line fittings at the m/cylinder. Place a large towel under it to catch fluid.
Yes, I remember bleeders on the m/cylinders, but $$$ to produce.
What about speed bleeders for the MC? That'd be cool. Pump from inside the car, have a special lover filling the cup. Gettin' lazy typing here. Mass migraine.
outasite wrote: Just install the m/cylinder and bleed in the car by using the brake line fittings at the m/cylinder. Place a large towel under it to catch fluid.
See, I've tried that, but there is only room for 1 hand in there. By the time I finish bleeding in the car and can get the hard line threaded into the CMC, all the fluid in the reservoir has already drained out...
sobe_death wrote:outasite wrote: Just install the m/cylinder and bleed in the car by using the brake line fittings at the m/cylinder. Place a large towel under it to catch fluid.See, I've tried that, but there is only room for 1 hand in there. By the time I finish bleeding in the car and can get the hard line threaded into the CMC, all the fluid in the reservoir has already drained out...
The idea is to just loosen the fitting a few turns and let the fluid slip by the threads. Before the pedal gets released, tighten the fitting back up.
Install it dry and reverse bleed it with a syringe?
Plus 1 for just cracking the fitting at the MC. It can be done by one person if you use something to hold the pedal down while you retighten the fitting.
step one remove cap. Step two apply double layer of "plastic wrap" to top of master cyl not to tight. step 3 reinstall cap. This should keep fluid from running out as air can't get in to the top of the reservoir.
sobe_death wrote:outasite wrote: Just install the m/cylinder and bleed in the car by using the brake line fittings at the m/cylinder. Place a large towel under it to catch fluid.See, I've tried that, but there is only room for 1 hand in there. By the time I finish bleeding in the car and can get the hard line threaded into the CMC, all the fluid in the reservoir has already drained out...
Saran wrap under the reservoir lid. Reservoir filled full. The vacuum holds the fluid in quite well.
Then bleed by cracking the fitting, pressing the pedal (admire the snap-crackle-pop sound of the air coming out), closing the fitting and releasing the pedal.
You can do it solo at the fitting as a gravity bleed, but it doesn't work nearly as well.
If you can get use of a pressure bleeder, that should be able to just push the air through the system and get it all to bleed, even if the master isn't bench bled.
Actually, 1/2 turn should be enough to bleed the air.
Could you add a T fitting to the line right at the MC? That could give you your bleeding ability without having to actually modify the MC, so it should be quite safe.
Just put it in and bleed as normal.
The amount of effort put in to bench bleed, clean, etc, is surely more time and effort then a few extra pumps of the pedal to bleed the air in the bore.
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