Although I believe your problem will end up being one of those described in
previous threads, there is one other you may also want to include: a leak.
I had the same symptoms and eventually discovered that I had a flexible
(that old plastic stuff) hose rub against the drive gear which sawed a hole
in the hose. Another reason not to use that stuff.
dg
----- Original Message -----
From: "Chuck Voboril" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, April 21, 2007 11:52 AM
Subject: RE: [F500] Pumping the Brakes
Chris,
Your problem may not be strictly one of air in the system-though that is
what it sounds like at first glance.
A leaky master cylinder will display this problem.
Another problem may be your pedal and pushrod mehanical system is not
allowing the pistons to return consistently and open up the reservoir
supply hole. Make sure nothing limits the pistons from returning. Old
gummed up seals, a gummed up bore, or dust boots on the push rod may
sometimes cause this,
Hopefully, your car already has the calipers aligned so the bleed screws
are in on the highest part of the caliper and you are getting a good
bleed.
Closing the bleed screw after each pedal depression and then opening again
upon pedal return is generally the best non-pressure bleeder technique.
Pump a little to get a good pedal before opening the bleed screw to go
down again.
Non-air in the system issues:
If you have rotors with run-out or calipers with o-rings that allow a lot
of pad knock-back
-your first application will be one of extremely long pedal travel.
If you are not backing your foot off the brake pedal enough while driving,
you may be heating the fluid up and boiling it. If your pumping problem
happens right off on the very first stop, then heating is not the problem
.
Chuck
From: "Christopher Eveland" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: [F500] Pumping the Brakes
Date: Fri, 20 Apr 2007 21:55:34 -0400
So my understanding is that if you need to pump the brakes to get good
stopping power, the first thing to check is bleeding the system. If
that doesn't help, is there anything else I should be looking into, or
just keep trying to perfect my bleeding technique?
The symptoms are that on the first pump, you slow down a little, but
not a whole lot, but on the second pump, you stop like nobody's
business (at least compared to a street car).
I've tried bleeding twice now, but no change...
Thanks for any tips!
-Chris
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