Digger Goreman

https://atlanta.craigslist.org/nat/bop/d/atlanta-promax-bike-brake-calipers-both/6958196247.html

Might want them for my Trek 800 Sport.

alcjphil

Those brakes were barely worth that much brand new

jimc101

Link is dead, but generally for brakes, unless they are mid-level or up, no.

You need to factor in missing components (do they have all the original mounting hardware) brake pads, for a set of cheap brakes, just replacing the pads can significantly add to the cost, instruction and fit, do they fit? and do instructions come with them (if your asking the question, you probably need instructions on how to fit them)

harshbarj

New they are worth about $30. So it's a savings of $15. If they are in good nick you might want to take a chance. If you are not hurting for cash then go new. It really all comes down to condition here. From the photos they look a bit rusty. I'd personally go new from what I can see, or find another seller.

Digger Goreman

Thanks all, especially harshbarj, as the pics aren't best and I did think I saw rust, also....

Moe Zhoost

I have promax calipers on a hybrid, though I replaced the levers with Tektro and will likely replace the calipers soon, because I have found them a bit fiddly and the spring perch is a bit sloppy. They do work ok though, so I'll wait until I find a better set at my local Co-op. The ones in the pic look a bit beat up and rusty, but that may be an artifact of the poor photography. The seller will take $10 if you meet him - I think that's an ok deal if they look better in real life and the pads are still good. Up to you though. What's wrong with the ones on your bike now?

Digger Goreman

Overall, nothing. Probably originals and, although functional since lbs did a free adjustment, one rear spring is a bit balky....

I love coincidences, when they work.... Looks like "not this time"

I ride on....

Retro Grouch 

One of the things that I discovered working on bikes is how much difference there is between even mid level brakes and cheap brakes. The cheap ones can be made to work all right, they just require constant fiddling to keep them working and retracting to my satisfaction. I HATE cheap brakes.

The truth is, unless you spend most of your riding time sprinting from corner to corner or unless you let your downhill speed build up too much, you really don't use your brakes all that much. Lots of folks are perfectly satisfied with some pretty crummy brakes.

The result of those two statements is that when bicycle manufacturers look for a place to save a couple of bucks on new bike specifications, the first place they look is at brake costs. If you are looking for the line between a quality and a not so quality new bike, look for Avid or Shimano brakes.