REFLECTOR: Parking brake

[Scott Derrick]

I've been flying for 3,000 + hours and never used a parking brake.

granted I've never flown a tail wheel aircraft which I've been told 
really needs one because it will roll into the wind at the slightest breeze.

Scott

Chuck Jensen wrote:
> David,
> 
> A parking brake does not come standard, by it's highly recommended.  Matco (Aircraft Spruce) make an inexpensive dependable brake that can be actuated with a little push-pull cable.  You plumb your lines into it and when it is set on 'brake', actuating the brakes will pressurize the line from the Matco valve to the brakes and hold pressure.  Or, you can actuate the brakes and then shut the Matco valve.
> 
> At one time parking brakes were discouraged; it was thought if the brakes were pressured and locked, and later in the day it warmed up, that it might over-pressurize the brakes.  Great theory but it's not a problem in practice.  I can set my brake and come back a week later and they are still locked.
> 
> Hint.  Set up your cable so that pushing the knob in releases the brake and pulling it engages the check valve.  If you reverse it and you happen to bump the knob in while in flight, then when you actuate the brakes on landing they will stay locked up....not good.
> 
> Chuck Jensen
> 
> 
> 
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> Behalf Of David Ullman
> Sent: Saturday, January 24, 2009 11:58 AM
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Parking brake
> 
> 
> I was flying my friends Grumman Tiger the other day and inquired how the
> parking brake works.  Since the Grumman has a castoring noise wheel and is
> steered with hydraulic toe brakes, this seemed a good question as I am now
> plumbing the brakes on my Velocity.  It appears that when you pull the
> parking brake knob, you are locking the hydraulic pressure on the brakes.
> So, to apply the parking brakes, you apply both toe brakes, and then pull
> the knob, hydraulically locking them.
> 
> I don't recall seeing this capability in my Velocity kit nor hearing it
> discussed on this site.  Anyone done this?  If so where did you get the
> knob/valve assembly, to do this?
> 
> David G. Ullman PhD ME
> Robust Decisions
> ullman at robustdecisions.com
> 541-754-3609
>  
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