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Bob Wichita
Joined: 19 Dec 2008
Posts: 36
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 Posted: Sun Mar 21, 2010 3:04 am Post subject: Master Cylinder |
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Still working on the master cylinders. Found one possible problem with
bleeding the brakes is that I have Cleveland brakes with the bleed valve on
the very bottom of the caliper. Don't believe filling from the master
cylinder down to the caliper expels all the air in the caliper.
Wanted to add a remote reservoir and looking at the master cylinder, there
is two outlets, one to the caliper and one for the bleed valve. If you
replace the bleed valve with an outlet to the remove reservoir what prevents
the fluid from going to the reservoir instead of the caliper? Don't see a
check valve in the Matco reservoir and there is nothing in the master
cylinder to prevent this..
Guess I don't understand brakes.
Bob, Wichita
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Bob, Wichita |
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psm(at)att.net
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| Posted: Sun Mar 21, 2010 4:07 am Post subject: Master Cylinder |
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Hi Bob,
I may have an idea of your area of misunderstanding for your brake system.
It is common practice for auto mechanics (especially shade tree mechanics
like I used to be) to bleed brakes by filling from the top of the system and
letting the fluid flow out the wheel cylinders. Airplane practice is just
the opposite.
The normal way to fill airplane brakes is to pump the fluid from the bottom
of the system to the top. This can be done with any of a large choice of
low pressure pumps. I like using a hardware store oil can - the kind with a
pump handle. Others use plastic mustard bottles or similar devices. You
attach a short piece of flexible tubing to the pump and the nipple on the
wheel cylinder and pump fluid until it comes out the master cylinder
reservoir.
I have only seen this used with dual combined master cylinders - one for
each main gear wheel. This kind of system has the brake system for each
wheel isolated from the other wheel system. The devices installed on the
rudder pedals include a small reservoir on the top end along with the master
cylinder. They have only one fluid line connection. Slave cylinders - with
an input and output fluid line can be used for the other rudder pedal on
dual brake systems.
The final part used in some airplanes is a shutoff valve between the wheel
cylinders and master or slave cylinders. This cuts off flow and acts as a
parking brake.
It sounds like you are trying to install an automobile style brake system on
an airplane. I don't know if this will work out for you.
One other basic difference between airplane brakes and auto brakes is the
type of fluid used. Cars use brake fluid. Airplanes use red hydraulic
fluid. I don't know exactly why, but I understand it is a real problem to
try to use automobile brake fluid in an airplane. The brake systems just
aren't designed for that stuff.
Good luck,
Paul
XL - Installing upgrade kit.
Still working on the master cylinders. Found one possible problem with
bleeding the brakes is that I have Cleveland brakes with the bleed valve on
the very bottom of the caliper. Don't believe filling from the master
cylinder down to the caliper expels all the air in the caliper.
Wanted to add a remote reservoir and looking at the master cylinder, there
is two outlets, one to the caliper and one for the bleed valve. If you
replace the bleed valve with an outlet to the remove reservoir what prevents
the fluid from going to the reservoir instead of the caliper? Don't see a
check valve in the Matco reservoir and there is nothing in the master
cylinder to prevent this..
Guess I don't understand brakes.
Bob, Wichita
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zjohnson(at)ucnsb.net
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| Posted: Sun Mar 21, 2010 5:11 am Post subject: Master Cylinder |
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Fill from bottom up..takes care of filling and bleeding at same time..no air !!
Jackie N5JZ
--- rfg842(at)cox.net wrote:
From: "Bob Gibfried" <rfg842(at)cox.net>
To: <zenith601-list(at)matronics.com>
Subject: Master Cylinder
Date: Sun, 21 Mar 2010 06:01:46 -0500
Still working on the master cylinders. Found one possible problem with
bleeding the brakes is that I have Cleveland brakes with the bleed valve on
the very bottom of the caliper. Don't believe filling from the master
cylinder down to the caliper expels all the air in the caliper.
Wanted to add a remote reservoir and looking at the master cylinder, there
is two outlets, one to the caliper and one for the bleed valve. If you
replace the bleed valve with an outlet to the remove reservoir what prevents
the fluid from going to the reservoir instead of the caliper? Don't see a
check valve in the Matco reservoir and there is nothing in the master
cylinder to prevent this..
Guess I don't understand brakes.
Bob, Wichita
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
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