Maddening. First, there are some systems that may need to be bled
once a day over several days. I don't know why; it just happens. The
sequence starting with the furthest wheel is correct. I try to avoid
pre-pumping and rapid pedal movement. I open the bleeder valve, then
tell the person to push the pedal down, taking a count to four before
the pedal hits the floor. Then close the valve and have the pedal
released. Rapid fluid movement causes cavitaion, which can 'foam' the
fluid in the brake system. Also the flex lines that run into the
wheel cylinders should be replaced. They can look good on the
outside, and be peeling on the inside. Keep the faith. ...bill
==========================================
--- In old-chevy-truck@yahoogroups.com, Kenneth Cluley
<[EMAIL PROTECTED]> wrote:
>
> Hi All Happy New Year!
>
> I have a brake line bleeding question (or two). For a year or so
I've had some problems with air getting in my brake lines and causing
me to have to pump the brake pedal to brake. I flushed all the lines
and rebuilt both front cylinders as well as the master cylinder.
Both rear cylinders look to be in good shape and none of them leak.
I decided that maybe the master cylinder bore was warped, pitted, or
something so I recently bought and installed a new master cylinder.
When bleeding the brake lines I used the following procedure.
>
> I had a friend pump the pedal until it was hard and I bled the
wheel valve while he kept pressure on the pedal. Once all the air
was out of the line I tightened the valve before he let his foot off
the brake. We repeated this until all air was gone in the line. I
did this on the furthest wheel and progressed to each one. Once all
the wheel cylinders were bled the pedal still had to be pumped to
engage the brakes. I went back to the rear wheels and repeated the
procedure and sure enough there was air in the lines again!
>
> My question is do I have to keep going around to all cylinders
multiple times to bleed them? Is it normal to have to repeat the
wheels several times to bleed the lines? I see no leaking at any of
the cylinders or the master. Why would the lines have air once each
wheel has been bled?
>
> As usual, thanks a million.
>
> Ken Cluley
> '50 3100 Deluxe
> Wichita Falls, TX
>
Ole Chevy and GMC trucks rule!
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