Brake Bleed dumb question

[pgeorgeson]

I have the Motive Power Bleeder and have read the instructions plus a number of posts here. I still have what is probably a dumb question.

Following the directions, I will empty out the reservoir and refill it, then attach the power bleeder, fill the power bleeder, clamp off the vent line, and pump up to 14-15 psi.

Won't there be a big air gap in the hose between the power bleeder bottle and the reservoir after the bleeder bottle is pressurized? If so, do I just work that air through the system when I bleed the first bleeder (LR)?

[big911fan]

If you look at the inside of the bottle, the fluid pick-up is at the bottom of the jar. As long as you keep enough fluid in the bottom of the bottle air will not enter the brake lines.

[Kidasters]

Let it sit for a second. The pressure bleeder will displace the air bubble back into the pressure bleeder bottle. Plus - with 15 psi, the bubble will be smaller.

[Eagledriver]

Paul,

I don't use that system but here is what I think will happen. The air in the line will indeed go into the reservoir but will be at the top of the reservoir and the fluid should start to flow before the reservoir is empty. If that doesn't happen stop the bleeding before the brake reservoir gets completely empty. You don't want to let air get into the master cylinder or you'll be bleeding for weeks.

-Andy

[Mitch Leland]

First off I use a different color fluid each time I change the brake fluid. I use the ATE Blue or Gold. Since I'm doing away with the old fluid anyway I just start at the rear right wheel cylinder and let the fluid flow until I get the new color. I do that on each wheel thus purging all the old fluid. You're not really talking about that much material, plus I don't have to go through removing the pump and cap at the master cylinder when you've drained the M/C to refill with the new fluid.

Like has been said earlier, you don't want to drain the system and have to start from scratch, however with a power bleeder it's not the worst thing...

[88-diamondblue]

I do what Mitch does with the ATE blue and gold. Once I have the new fluid drained through the system I put the power bleeder on and pressurize the system and do my bleeding without putting brake fluid in the bleeder. Worked really well and don't need to clean the bleeder. Remember to pinch off the overflow tube.

[pgeorgeson]

Thanks everyone. It felt like a dumb question but I thought I would ask before I give it a shot tomorrow morning.

Andy, are you racing at Infineon in a couple weeks?

[Eagledriver]

I'm going to miss the first race. Family vacation for spring break. Hope to see you in April.

-Andy