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coaster brake rebuilds(10 posts)

coaster brake rebuildssalmonwheel
May 14, 2002 9:55 AM
I have an old single speed tandem with a bendix coaster brake. Does anyone know of a source for parts to rebuild the hub? Also, does anyone know of a good source explaining repairs and rebuilds of these items? I intuitively figured out how to repack the hubs on my "regular" external brake bikes, but the coaster system seems a bit more complex, and I'm not sure of how to check for excessive wear.

Thanks in advance
I don't know where he got them but ...Humma Hah
May 14, 2002 3:34 PM
..."Tony" at Black Mountain Bicycles in San Diego managed to order me a new set of guts for my Bendix 70 coasterbrake last year. The company that produces them (they're new production) does it under license to Bendix, but the paperwork that came with the parts did not identify who it is or where to get the parts. That's an inside secret, evidently. Tony really knows old bikes.

The new parts used 4 shoes instead of the original 2, but works perfectly in the old hub, smoother than the original.
I essentially now have a Bendix 98 coasterbrake, even came with a new torque arm that says so.

My brake is a Mexican-built newer model, 1970/71 production, with no red groove. Earlier models have a red groove in the hub, different parts, but I think you can still get them.
I'm self-taught ...Humma Hah
May 14, 2002 3:58 PM
... I overhauled my first coasterbrake when I was only 12, but you gotta understand, I AM a rocket scientist!

That said, rocket science ain't all that difficult, and anyone with a touch of mechanical skill can tear down and reassemble a Bendix coasterbrake, with a little practice.

Yes, its the most complex brake I've ever seen on a bicycle. Yes, you can put it together wrong. However, it will be immediately obvious that something ain't right when you try to operate it if a part is in backwards or in the wrong place.

The one I just overhauled was the first Bendix I've ever seen that was actually worn out. The hardened screw parts were actually beginning to crumble, after about 30 years and about 25000 miles. It was beginning to slip on the forward pedal stroke, and a Bendix is usually very good about not doing that. You have to be a fanatic to put that many miles on a coasterbrake bike (I happen to be a fanatic). Wearing one out is rare.

It is possible to damage the brake pads, or wear them out, with hard mountain braking. They's start to scream after regulating the speed down about a 500 ft descent. Once that happens, they're not happy until they get fresh grease, but that's usually all they need after overheating.

The most common problem I've seen is pitting of the bearing cones. They'll tolerate quite a bit of that, but I like to replace those if I notice they're pitted.

The biggest challenge is getting everything adjusted just right when you put the brake back together. Your first time, expect to take at least 6 attempts at adjusting the cones. Then, after a break-in period, check the cone play and adjust them again. A Bendix likes to run just a teensy bit loose.

Shimanos coasterbrakes are a whole different kettle of fish. Throw them out. Junk right from the factory.
I'm self-taught ...curlybike
May 14, 2002 6:11 PM
Bendix brakes are a piece of cake compared to a New Departure coaster.
I'm with Humma, but a drawing helps.cory
May 15, 2002 8:00 AM
I was afeared to go messing in there, as Grandpa used to say, but when my son got his first (used) bike about 15 years ago, I wanted to make sure it was perfect, so I took the Bendix brake apart to "rebuild." I couldn't find anything worn out (this on a bike that had gone through a neighbor's three skidmarking boys), so I just cleaned it, greased it and put it back together. He's in college now, and the bike was still running for another neighbor as recently as last year.
An exploded drawing is helpful but not necessary. Can't remember where I got mine, but I didn't have any trouble finding it.
re: coaster brake rebuildsgtx
May 14, 2002 7:49 PM
you can try these guys.
re: coaster brake rebuildswooglin
May 15, 2002 8:52 AM
Try to find an old copy of Glenn's Complete Bicycle Manual (1976). Your library might have one, or go on line.
I found a copy of Glenn'ssalmonwheel
May 15, 2002 10:45 AM
Everything I needed a drawing, adjustment, maintenance, signs of wear. Had to go to a different branch of our library. Coaster brakes just aren't covered in most bicycle repair books.
Grease? nmwooglin
May 15, 2002 12:00 PM
I favor Mobil 1 synthetic, but ...Humma Hah
May 15, 2002 1:46 PM
... a good automotive lithium-based wheel bearing grease will do OK.