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Brake drum wear info

 
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dougsappllc(at)gmail.com
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PostPosted: Thu Jun 09, 2016 5:27 pm    Post subject: Brake drum wear info Reply with quote
Listers and Lurkers:

I have always wondered if there was actually a published max wear measurement for the Yak/CJ brake drum.  So today I decided to practice what I preach and sat down with a stack of manuals and started reading.  It's amazing what can be found with a bit of due diligence.  I found the info in the PT-6 Trainer Aircraft Overhaul Manual (Airframe Accessories).
Oddly enough section 12-1 "Brake Disk" only yielded the minimum thickness of the brake pad, which is 8mm.
Section 11-1 "Landing gear Wheel" explains the max number of and depth of groves in the brake drum and mentions that the drum can be turned to a MAXIMUM ID of 196mm.  It goes on to say that if the drum is blank it should be turned out to 195mm (new dia).   If you do the math this works out to just shy of .040 worth of wear.  I am sure these numbers will be applicable to the Yak 18T,50,52 and the CJ6 and many others.
Some of you may recall a shipment of brake drums which were found to be to small in the ID to fit over the pads.  These must have been the blank drums as described in section 11-1.
All good info.
Best,
Doug

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dsavarese0812(at)bellsout
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PostPosted: Fri Jun 10, 2016 3:14 am    Post subject: Brake drum wear info Reply with quote
Excellent post Doug and definitely very useful information.
Dennis

From: doug sapp <dougsappllc(at)gmail.com>
To: yak-list(at)matronics.com
Sent: Thursday, June 9, 2016 9:25 PM
Subject: Brake drum wear info


Listers and Lurkers:

I have always wondered if there was actually a published max wear measurement for the Yak/CJ brake drum. So today I decided to practice what I preach and sat down with a stack of manuals and started reading. It's amazing what can be found with a bit of due diligence. I found the info in the PT-6 Trainer Aircraft Overhaul Manual (Airframe Accessories).
Oddly enough section 12-1 "Brake Disk" only yielded the minimum thickness of the brake pad, which is 8mm.
Section 11-1 "Landing gear Wheel" explains the max number of and depth of groves in the brake drum and mentions that the drum can be turned to a MAXIMUM ID of 196mm. It goes on to say that if the drum is blank it should be turned out to 195mm (new dia). If you do the math this works out to just shy of .040 worth of wear. I am sure these numbers will be applicable to the Yak 18T,50,52 and the CJ6 and many others.
Some of you may recall a shipment of brake drums which were found to be to small in the ID to fit over the pads. These must have been the blank drums as described in section 11-1.
All good info.
Best,
Doug

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Lancer



Joined: 21 Apr 2016
Posts: 30
Location: Cairns, Australia
PostPosted: Sat Jun 11, 2016 2:41 am    Post subject: Re: Brake drum wear info Reply with quote
Thanks for the info Doug, I have been looking for this info as I have a number of used drums and wanted to find out if they were still serviceable or not..... I'll start measuring this weekend

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andrewf



Joined: 16 Aug 2014
Posts: 6
Location: Sydney
PostPosted: Fri Jul 29, 2016 5:16 pm    Post subject: Re: Brake drum wear info Reply with quote
Thanks for sharing Doug

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