Missing key from brake hub

[Cibarius707]

Heyoooo

Yerf dog owner here. Just picked it up from a yard sale for $150 working! Working a few kinks out and I hit the fence because the key/set screw for the brake hub is messed up.

The key is missing.. and there’s also a 1/2” bolt in the hub collar. The 1/2” bolt isn’t strong enough alone to hold for braking so I’m wondering if anyone can help me determine how those keys work and how to properly size a replacement.

Thanks!

 

[mckutzy]

Let see some pics on this???

 

[landuse]

Welcome! Post some pics so that we know what you are talking about. Keys are pretty common and you might just need to replace yours

 

[anderkart]

Heyoooo

Yerf dog owner here. Just picked it up from a yard sale for $150 working! Working a few kinks out and I hit the fence because the key/set screw for the brake hub is messed up.

The key is missing.. and there’s also a 1/2” bolt in the hub collar. The 1/2” bolt isn’t strong enough alone to hold for braking so I’m wondering if anyone can help me determine how those keys work and how to properly size a replacement.

Thanks!

The first pic Illustrates how you could measure the depth & width of the key-size you need. (the key you need might be a metric or Inch size, so you need to very accurately measure...)

The second pic Illustrates how a correctly-sized key would perfectly fit in-between your axle and brake hub.

_________

 

[anderkart]

Most Keys are perfectly square down their length, but not all, so measure carefully...

Most Ace Hardware stores have a few different sizes of Keys in stock. They call them Key Stock, they come in longer lengths then you might need. If so, you could use a Hacksaw cut/shorten it down.

You'd typically use a Caliper tool like this to take accurate measurements for the key-size you need: You can find some of these Caliper measuring tools priced as low as $5-$10...

 

[Cibarius707]

Most Keys are perfectly square down their length, but not all, so measure carefully...

Most Ace Hardware stores have a few different sizes of Keys in stock. They call them Key Stock, they come in longer lengths then you might need. If so, you could use a Hacksaw cut/shorten it down.

You'd typically use a Caliper tool like this to take accurate measurements for the key-size you need: You can find some of these Caliper measuring tools priced as low as $5-$10...

Thanks! Picked up some 1/4” from my hardware store and cut a chunk that fit in there. Seems to be holding. The set screw on the brake hub is tripped so I’m getting a new brake hub in the mail.

Thanks!

 

[Joe-405]

I kept throwing the key on my Drag Minibike from last year buildoff. I finally just bought a long key and installed it where the whole length of the slot was all key so it couldn’t come out no matter what it did. Even if it was loose.