REFLECTOR: Toe Brakes, again...

[Hiroo Umeno]

Steve,

Thanks for the suggestion.  Just to be clear I understand what you are saying...

You mean, I need to bleed "top down" (start with the system empty, fill from the reservoir)
and pump the brakes until fluid come out of the fitting at the gear, clear of bubbles, hold the brakes down, tighten the fitting at the gear legs?

That sounds like at least two person job (one to hold the brakes while the other tighten the fittings).

Also, since there are two cylinders in series for each side, I am assuming I pump the "upstream" side, in my case, the co-pilot side?

Do I understand this right?

Hiroo

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of steve korney
Sent: Saturday, June 09, 2007 9:32 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Toe Brakes, again...


Hiroo...

I have to bleed each of the pilot and co-pilot left and right pedal
cylinders individually at the top of each cylinder ... (On my Glasair) ...
To get all the air out of the brake lines... I crack the line open and push
on the pedal until a little fluid comes out clear of bubbles, then close the
fitting before I release the pedal...


Best... Steve




----Original Message Follows----
From: Hiroo Umeno <humeno at microsoft.com>
Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: REFLECTOR: Toe Brakes, again...
Date: Sat, 9 Jun 2007 21:21:07 -0700

The second installment of the ongoing brakes saga...

My setup is a factory toe-brake kit with Matco brakes on FG SUV (std
fuselage, std wing).  My brake lines are a combination of the hard aluminum
line from forward bulkhead to gear bulkhead and the factory provided
nylaflow line, the rest of the way.

It was a rainy day today and I decided to bleed the brake system.  I drained
the system of fluid, then re-filled it.  I generally do this "bottom up"
where I start filling the fluid from the lowest point in the system (bleed
valve at the gear) and fill the fluid until the reservoir is full.  My
thinking is that going bottom up will ensure that there are no trapped
bubbles in the system.

The brake is way too "soft" for my liking, still.  There is quite a bit of
toe motion when pushing on the brakes.  It is a lot more than what I am used
to on Cessnas and Pipers.  On those, I get the "push back" almost as soon as
I get my toe on the brakes and there is very little room to Squeeze.  On my
plane, it feels like I am displacing a lot of fluid through the master
cylinder.  Shouldn't there be very little movement on the pedals?  The way I
understand the system work is that there should be very little fluid
movement and the brake should work by pressurizing the system and not
displacing.

Curiously, I found that the passenger side left brake feels "taught".  All
the rest felt rather mushy.

Aside from bleeding again to check for air bubbles, what else should I
check?  There are no leaks in the system along the way, either.

Hiroo



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