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Re: Motive brake bleeder: am I using it correctly? Posted by Larry West [Email] (#1140) [Profile/Gallery] (more from Larry West) on Mon, 1 Jul 2013 06:51:50 In Reply to: Motive brake bleeder: am I using it correctly?, steve, Fri, 28 Jun 2013 15:22:23 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Brake lines are extremely small in cross-section, so the "flow" will be, at best, "stately". You'll see it coming out in a constant flow, but it will not be fast by any means.
Using a catch bottle is good, and having the hose in the fluid is good also. The main reason you do that is so if you do run out of fluid in the reservoir and bleeder, you'll be far less likely to introduce air from the caliper side.
Using the bleeder, of course, you put fluid in the bleeder first. Then you suck out everything you can from the MC reservoir, as Justin said, to remove all the crusty stuff that accumulates. Then fill the reservoir with fresh fluid, put the bleeder cap over the reservoir, and pressurize the bleeder. You don't need a lot of pressure, as once the bleeder screw is open, the only resistance left is the narrowness of the lines.
As for how much pressure can a MC take, I've used a "Gunson EZ Bleed", which is a product offered overseas. Same principle as the Motive, but it uses tire pressure instead of a pump. I don't think it has a regulator (if it does, it is not obvious), but I've never blown any seals on MCs with the 30PSI or so in a tire.
The WIS recommendations for how much to remove are solely for what you remove at the caliper. They don't include what you suck out of the MC. And, unless otherwise noted, should be per wheel. A full "flush" should use up the better part of 2L of brake fluid.
The important things to get "right" are:
1) all old fluid out, and replaced with new
2) no air bubbles in the fluid before shutting the bleeder screw
3) good pedal feel
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