12/06/2021
On this Sunday evening edition of This Old Airplane: We’ve successfully refurbished the brake calipers on both MLG wheels!
The tasks accomplished this round started with removing both brake calipers from the plane and mounting a small brass wire brush (.45cal bore brush was perfect!) in our cordless drill and polishing the torque plate mounting holes.
Additionally, we jacked the wheels and inspected for heat damage, disc warpage, bearing condition and/or any other issues…
Then, after capping the brake lines, we brought the calipers to our home workshop for cleaning and refurbishment.
Cleaning was pretty straightforward, but in order to reseal the calipers, we needed to pop the pistons out of the bores. The right caliper popped right out with low pressure shop air, but the left side that gave us trouble wouldn’t budge!
It took pressure carefully applied with a hydraulic hand pump to get the pistons out of the bores on the left side. Subsequently, we polished the pistons and installed new o-rings all around. There was a mild amount of corrosion evident in the caliper bores, so we lightly honed them to get back to a clean/useable surface.
After cleaning and applying a light coat of silver lacquer to get everything fresh looking (after masking off critical areas), it was time to rivet on new brake pads and reassemble.
This afternoon’s trip to the airport had us reinstalling the calipers, flushing the lines with new fluid, bleeding and reservicing the system.
Then the fun part! Taxi testing followed by a couple trips around the pattern! Happily, we’re back up and running better than ever!
Tune in next time when we continue the adventures of keeping and flying our classic Centurion!