Rear brake drums for 66-4107

[Templar52]

Hello guy's is someone have a new replacement number for a rear drums.
Thank's
Alain
66 4107

[luvrbus]

If those are the GM number 651507 drums good luck finding those,the guy in MN has a kit to make other drums work call him JD @ C&J Bus  (800)228-7349

[Templar52]

My brake number acording to the part manual is 2475454

[luvrbus]

Try crossing the number over to Webb or Fleetrite I didn't have any luck

[chessie4905]

The rear drums are 8x 14.5. The 4905 drums are 10x 14.5 and are supposed to be unavailable. Check with Luke. The 8 inch are possibly still available.

[Templar52]

Will cost a lot to ship.......

[chessie4905]

To where??? You don't have a state listed in your profile Shipping by Greyhound used to be pretty cheap.

[RoverScout]

Newbie question, what would be the reasons for replacement ?? I'm assuming having them turned on a lathe is a first option when servicing drum brakes.
Signs of when thy should be turned ??

Scott

Sent from my ONEPLUS A5010 using Tapatalk

[Bill Gerrie]

Try this page and call or email them.
https://www.webbwheel.com/interchange.php

[chessie4905]

Brake drums develop cracks from intense heat like descending a mountian. Brake shoe friction causes wear to drums. Usually, when lining is worn down to a thickness that requires replacement, (factory or state vechicle inspection requirement), The drum surface is trued up in a drum lathe for even contact with new lining. The drum has only so much material that can be removed to recondition. The maximum inside diameter is cast or stamped on all brake drums. Usually drums can be cut three or four times in their service life before requiring replacement. Excessively deep cracks or wear groves may cause enough material removal necessary to clean up that, only one or two cuttings are available. Cutting a drum beyond max. allowable oversize can result in a drum failure down the road. It is basically a heat sink. The thinner the braking surface gets, the quicker it will heat up, distort, wear, and crack.
Btw, when you cut drums during reline, you need to install thicker brake blocks, since the id. of drum is larger. If you don't, the shoes will only contact the drum at center of shoes and won't get full contact till lining is worn down a ways. Also, if you don't replace worn shoe pivot bushings and brake camshafts and their bushings, you will get significant lost motion when brakes are applied. This is critical as our brake chambers have a limited amount of travel to apply brakes, and lost motion will reduce that travel. Also, worn clevis attachment and worn slack adjusters can addto the play.

[buswarrior]

And lot of busnuts have unwittingly inherited worn brake components.

What business will spend thousands on a brake job for a coach that is going to be sold?

It might break your heart, and your bus budget, but having the brakes and wheel end components gone thru by a pro to confirm, or deny, that everything is within specification can save a world of trouble later.

Running drums that are too thin is irresponsible. When they crack, they snap pieces off, and where does that heavy chunk of steel end up bouncing to?

On a budget, ask around for a mechanic who will come to you on the weekend for cash, who knows how to work on the ground with a coach. Make sure he brings the drum gauge with him...

Find out when the local mom and pop charter company has a slow day to look at it.

There is a lip on some drums, if measuring yourself, it has to be inside on the wearing surface, not at the edge, or you get a false measurement.

The nice thing, once you confirm the brake parts are within specification, you'll not likely wear them out anytime in the next decade or two, at average busnut mileage rates... annual preventive maintenance and a periodic eye to adjustment will be all you'll need

Ignorance is NOT bliss,when it comes to your brake condition...

Happy coaching!
Buswarrior

[luvrbus]

The old brake drum system is going the way of the Dinosaurs,truck and bus shops have sold off their drum turning machines for scrap there was to much liability involved in turn drums, the lairs for hire on TV made sure of that.Drums are replaced now and the manufacture have the liability not the shop     

[chessie4905]

I'd get new drums while or if they are still available, unless the ones on the coach are in excellent shape, which is more unlikely than not.