Brake caliper pin lubricant

[pa38112]

I have always used a high temp anti seizing compound. It keeps moisture off of the metal parts. If you were to get the breaks wet - either by flying in the rain, or landing on a dew covered grass runway. The parts could easily rust and begin to bind with a few weeks of down time.
There is no right or wrong answer, you need to decide how you feel about it.
If you try anti seize and the parts wear out because it "attracted" dirt then I will personally buy you a new set of parts. Dirt is going to get there with or without the anti seize. - As Mike Bush says: corrosion, not wear, is the enemy of airplanes.

[Captain_John]

Well Gents, this was my decision:

I took in all this information and what Cleveland says and followed the advice of my A&P IA friend.

As mentioned in this thread, I polished the bore and pins. I checked the pins for damage (like being bent or out of line) and there was none.

I then put a very light coating of Permatex Anti-seize on the pins and reassembled them. So far I have about ten hours on them and they seem to be sliding just fine.

What called my attention to them in the first place was an event upon rollout when clearing the runway, one caliper was binding badly. It was enough to make me think that I had a flat tire. The jury is still out as to why that actually happened. Prior to this, I always assembled them dry as recommended by Cleveland. I figured that I would try the Anti-seize for another data point.

Thanks for all your input. Looks like you can't go wrong whichever way you go?

CJ

[Carl Froehlich]

Originally Posted by Captain_John

Well Gents, this was my decision:

SNIP
What called my attention to them in the first place was an event upon rollout when clearing the runway, one caliper was binding badly. It was enough to make me think that I had a flat tire. The jury is still out as to why that actually happened. SNIP
CJ

Be careful here. I had the exact same problem and in short order it totally trashed a tire and the brake pads on that side.
The root problem was a rolled O ring in the brake caliper. I now carry couple of spare O rings and brake pads in the plane.

Carl

[912ry]

My first hanger land Lord was an old a&p that took me under his wing. He told me to use boelube. Aircraft spruce sells it. It's like a big stick of white wax. BOELUBE? BL70200-13 SOLIDS LUBRICANT - 1.6 OZ PUSH TUBE
476 hours on RY and no problems. Yrmv

[Captain_John]

Carl,

Thanks for the tip. While the caliper was out I removed the puck and installed new O rings. The old one was perfect.

Thanks!

CJ

[gasman]

Originally Posted by Captain_John

Well Gents, this was my decision:

I took in all this information and what Cleveland says and followed the advice of my A&P IA friend.

As mentioned in this thread, I polished the bore and pins. I checked the pins for damage (like being bent or out of line) and there was none.

I then put a very light coating of Permatex Anti-seize on the pins and reassembled them. So far I have about ten hours on them and they seem to be sliding just fine.

Thanks for all your input. Looks like you can't go wrong whichever way you go?

CJ

The pins don't slide in and out... The first time you set the brakes after replacing the pads, the pins move in so the pads contact the disc. After that first set, the pins only move a few thousands during brake application and release. But, as the pads wear, the pins must be able to move in to allow the pads to contact the disc. The pins move in less than .10 during the life of the pads.

Do your own test, If your pads are wearing down even, then you are doing what the pads like.

The pins won't bend, the casting will crack where the pin is bolted.

[Captain_John]

Yeah, I know that the pins don't move.

By, "they seem to slide", I was referring to the caliper/ pad assembly.

Sorry if I wasn't clear about that.

CJ

[Captain_John]

Originally Posted by 912ry

My first hanger land Lord was an old a&p that took me under his wing. He told me to use boelube. Aircraft spruce sells it. It's like a big stick of white wax. BOELUBE? BL70200-13 SOLIDS LUBRICANT - 1.6 OZ PUSH TUBE
476 hours on RY and no problems. Yrmv

This was my choice also.

I might try it on another occasion!

Thanks for the reassurance!

CJ

[gasman]

Originally Posted by Captain_John

Yeah, I know that the pins don't move.

By, "they seem to slide", I was referring to the caliper/ pad assembly.

Sorry if I wasn't clear about that.

CJ

That's the part that only moves less than .10" during the life of the pad....

Sorry I wasn't clear on this.

[Captain_John]

Originally Posted by gasman

That's the part that only moves less than .10" during the life of the pad....

Sorry I wasn't clear on this.

So, you are saying that the pins don't slide?

CJ