VWkila

So I'm benching bleeding a master cylinder. I hook up a clear tubing into the cylinder and the other end is in the resorvoir, full of brake fluid.

When I pump in the cylinder, I see the air being pushed out. But when I release the cylinder, the same air that was pushed out, gets sucked right in!

What's going on?

SkRiBLaH

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VWkila &raquo;</TD></TR><TR><TD CLASS="quote">
What's going on? </TD></TR></TABLE>

you might be doing it wrong.

Morning Call

u have to tighten tyhe bleed bolt before u release the pedal

unless u have a 1 way bleed bolt u can pickup for a couple bucks (lets **** out, but not back in)

VWkila

Well, the MC is cramped on my vise. And the MC came with a kit that includes clear hose, etc., 'though I guess I can hookup a bleed valve to it.

I think the problem is that my clear hose is too long.

VWkila

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VWkila &raquo;</TD></TR><TR><TD CLASS="quote">I think the problem is that my clear hose is too long. </TD></TR></TABLE>

Nope... I just tried this, still doesn't work.

Any ideas?

splitime

Fill reservoir with fluid. Run hoses from MC into fluid... then start pumping. You'll eventually be able to push all bubbles out.

If you have serious bubble issues... pump it then hold tube up and allow bubbles to bleed up/out, then put back into fluid in reservoir.

93_hatch

what i do to bench bleed while in the vise is put ur fingers over the 2 holes push the rod in but not all the way like 3/4th the way keep ur fingers pressed down a lil bit with squirt out but keep ur fingers on the holes that way now air will go back it do it like 4to 5 times i think should be good then tose it on. i have done 2 that way and no problems

93CivicSI

I did this very thing this past weekend myself - it will take time, I probably cycled the push rod on my MC 20 times to get all of the air out of it.

VWkila

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93CivicSI &raquo;</TD></TR><TR><TD CLASS="quote">I did this very thing this past weekend myself - it will take time, I probably cycled the push rod on my MC 20 times to get all of the air out of it.</TD></TR></TABLE>

I've been doing this since last Saturday and it still has air.

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93_hatch &raquo;</TD></TR><TR><TD CLASS="quote">what i do to bench bleed while in the vise is put ur fingers over the 2 holes push the rod in but not all the way like 3/4th the way keep ur fingers pressed down a lil bit will squirt out but keep ur fingers on the holes that way no air will go back it do it like 4to 5 times i think should be good then tose it on. i have done 2 that way and no problems</TD></TR></TABLE>
This is how i've been doing it for years.

xoutlawz00x

guys im gonna change my mc and bb soon do i need to bench bleed.. what excatly is bench bleeding

VWkila

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xoutlawz00x &raquo;</TD></TR><TR><TD CLASS="quote">guys im gonna change my mc and bb soon do i need to bench bleed.. what excatly is bench bleeding</TD></TR></TABLE>

Well, bench bleding a MC involves you getting rid of all the air that's trapped in your new MC. One of the most important steps in bleeding your brake system, yet most overlooked.

You put the new MC in a vise, and a new MC will usually come with a bleeding kit, hook it up with tubing and submerge the other end of the tubing in brake fluid and pump.

http://www.geocities.com/aussiebug1970/bleed