REFLECTOR: Brake shudder - RG

[gibbons]

Yes, Do take then to a grinding shop and they will make them true.
Barry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Al Gietzen
Sent: Sunday, December 03, 2006 11:23 PM
To: reflector
Subject: REFLECTOR: Brake shudder - RG



After the first few landings with the Matco brakes, I began to get
'shudder' of the main gear somewhere in the 40 - 30 kt range when
applying the brakes on roll out.  This can be annoying, as well as cause
a pretty good shake of the plane.  I'm told this is common with
Velocitys.  There is a point of resonance involved here, and there must
be a driving force.  

 

I recall someone posted here about just a few mils distortion of the
rotors causing this, and milling the rotors true solved the problem.  Do
I recall correctly, and did the problem stay solved?  Where/how did you
get them trued up?

 

While investigating the issue, I found that the retracted position now
the gear is about 1/8 - 3/16" further forward in the wells, which
eliminated the clearance of the gear doors to the stake opening.  Is
this a common occurrence?  I thought that perhaps the pivot bolts on my
1996 kit were not grade 8 and may be bent a bit, but they were grade 8.
I changed them out anyway, and found it eliminated a bit of play.
Examining the bolts shows that they were not very round, and the high
spots were worn.  I think the new bolts are more true.

 

I also noted there was now about .010 - .015" fore-aft movement of the
gear (the spacers originally fit very close), and the bolts were loosely
tightened to allow them to rotate in the bushings, rather than the
sleeve in the leg rotating on the bolts.  When I installed the new bolts
I tightened them a bit more which reduced the clearance, but will mean
that the bolts will not rotate in the bushings.  Any opinion on whether
it matters?

 

Thanks,

 

Al

 

 

Thanks,

 

All

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