Brake questions

My master break cylndley lost all its fluid . How do I bleed it properly without taking it out of the engine bay??

 

Uh, I'm guessing you mean the brake master cylinder. You can't bleed it properly without removing it from the booster. You can bleed it improperly by removing the brake lines from it, installing barbed fittings with the correct thread pitch in the brake line ports, then running tubing from the barbed fittings back into the top of the MC reservoir. Pump the brake pedal full stroke about 1000 times, holding it to the floor at the end of each stroke. This is basically simulating bench bleeding, which is what you should actually do, as pumping the brake pedal will not depress the piston in the MC enough to push all of the air out.

 

im almost certain this will work. you may have a little bit of air in the end, but it will eventually float out into the master cylinder.

the real issue is why it drained to begin with. op?

 

Not to derail the thread, op @drr is on the money. What is a good color for the fluid to be? Ive heard constant hard braking which i do very often will cause carbon buildup in the fluid because it gets so hot it burns. Had my brakes done, guy told me he flushed fluid but it looks exactly the same as before. 07 2nd gen, i know, double whammy im posting in a 1st gen but whatever. Thanks.

 

Wow I get more confused all the time.

So when the Master Cylinder is drained for what ever reason it should be removed and bench bled

I learn new things all the time

I must have been doing things wrong all these years Never having done this step

 

But did you die?

 

The reason you can't get all of the air out from behind the piston(s, there's actually two) in the MC when it's still attached to the brake booster is because the stroke of the booster is designed specifically so that the MC pistons can't overtravel. When you bench bleed manually, you need to push the MC pistons all the way to the end of their travel to allow air trapped behind them to escape through the fluid return ports in between the two, which normally remain covered at full stroke of the booster.

 

Hmmm. I never knew that. I've bled my master cylinders while they were on the trucks a few times.

And I'm still alive (what you said does make sense though...)

 

Heck being dead is not hard it is it going from that place where you just hang around and float down that tunnel to the light and some bugger for the fun of it just smacks you

Then things get real confusing for quite some time

I can say I never bleed a Master Cylinder in 40 plus years Interesting