Help on coaster brake self destructed

Discussion in 'General Questions' started by Turtle Tedd, Jul 12, 2009.

  1. Turtle Tedd

    Turtle Tedd Member

    While riding today,not very fast at all,applied rear coaster brake easy a few time and it would all of a sudden grab hard ..did this a couple of times...couple miles later heard a loud clunk...when I took a look the brake arm was bent in half,pretzal like ,but still attached to the frame by the clamp and working...When I got home I pulled off the wheel..the axle is wobbleing around big time..I guess the bearings and rest of the chinese parts in there are toast...been reading all the posts on coaster brakes ...This bike is a new shwinn del mar...I dont know if I should have it rebuilt....I don't mind spending the cash for good parts but on the other hand I do not want to spend a dime on a rebuild thats only going to last 50miles....Need some of you guys experiance and sugestions here....will wait till tuesday or wed to take it in...what do you all think'whats my options
     

  2. duivendyk

    duivendyk Guest

    Poor dumb TT,don't mess with ANY brakes coming from China and least of all any coaster brakes,or are you anxious to get to the Pearly Gates ASAP,then keep right on going.
     
  3. Turtle Tedd

    Turtle Tedd Member

    duivendyk for whats in your brain thats not much help..after all this is a motorbike building forum...its been fun insulting each other on the white zone but I need some expert info here...what you got....haven't really read all your posts..have you built any of these HT motorbikes? gimmy some info,sugestions..need some possitive feedback here
     
    Last edited: Jul 12, 2009
  4. icyuod2

    icyuod2 Member

    if a coaster arm is not attached to the frame, the exact same things you described happen.

    the coaster won't seem to work, then it grabs hard. at the same time the arm will rotate loosening the hub (making the wheel wobble) this however usually does not happen if the arm is attached to the frame.

    so chances are the reason your wheel is wobbly is because the coaster brake has loosened the hub. i imagen if you turn the bolts (inside your drop outs, that the wheel will be right as rain (excluding the bent coaster arm)


    i would love to see a pic, i cant imagen how you'd bend the brake arm before tearing the little coaster arm clamp from the frame. it is rather puzzling.
     
  5. Turtle Tedd

    Turtle Tedd Member

    icyuod2 the coaster arm was still attached to the frame after this happened . It never did tear loose just slid down as somehow the arm bent..puzzling for sure..cannot send pic at this time
     
  6. give me vtec

    give me vtec Active Member

    thats one reason why I would never use a wal mart bike... I wouldnt even trust it to pedal down the street, let alone with an engine. I wanted to do a black del-mar but changed my mind when I got to wal-mart and rode it around the store for a minute.
     
  7. Just_Gasit

    Just_Gasit Member

    I smoked a coaster brake on a cruiser on a long down hill road. I tried real hard to keep the speed down and waited for time to time stopped to let it cool off. Near the bottom, I pushed it and it started to grab hard, when I stopped, the hub was black and sizzled when I poured some water on it. I never used it again and traded the whole bike for a couple of tubes for another bike at the bike shop. Motorizing a bike with only a coaster brake is risky and not advised. You can fix your coaster brake but add more brakes.
     
  8. icyuod2

    icyuod2 Member

    did one of the bolts on your rear sprocket catch the coaster arm?
    i imagen that would fold the arm in 1/2 while still attached to the frame.
     
  9. bamabikeguy

    bamabikeguy Active Member


    So, the DelMar is a single speed/coaster? I've read folks saying they've used that model, but never investigated it, (I thought it was the 7 speed equivalent of the Jaguar/PointeBeach, maybe from K-Mart). You can change a 7 speed into a single relatively easy, to do the reverse is tough, because of the cabling and finding a spot to bolt on the hand brakes.

    Those two, Jaguar and PointeBeach, are good starter bikes, in the $150 range.

    If you'll put up your closest Craigslist bike postings, we might be able to spot a suitable used bike to motorize, save you some bucks.

    What has me puzzled TT is whether you were using the DelMar's 16 gauge wheel in your build, or had you purchased a 12 gauge wheel like the MB forum has been recommending since the beginning?
     
  10. HoughMade

    HoughMade Guest

    I would go ahead and rebuild it. Before I ever used my new rear wheel, I disassembled the coaster hub and greased the bearings myself and other hub parts. I have heard bad things about the state of lubrication of new bikes. I am guessing the breakdown of the brake was more due to inadequate grease than any inherent problem.

    That being said, Once it is rebuilt, I would fit caliper brakes- should be pretty easy. Save the coaster for the back-up plan, not primary braking. That's what I do.
     
  11. duivendyk

    duivendyk Guest

    TT what do you need?I made that abundantly clear,GET RID of that wheel,if you care at all about your continued sentient existence on this planet.At the tender age of 15 I went on a trip to the Ardennes (a mountainous region in SE Belgium,with nothing but a Sachs Torpedo back-pedal brake,very well built BTW,which was perfectly fine when flatlanding in Holland.But on long hills it would badly overheat &fade.Dangerous and scary.(water to the rescue provided you can still stop).Had to replace most of the guts.Not enough energy storage capacity.Some of the cheaper ones are built with inferior materials.Look OK, but come apart.Quality materials steels etc are KEY in highly stressed parts.That's why the model T stood up to hard use on lousy roads (chrome-vanadium steel for key suspension parts).Henry Ford was on the ball!.Get something decent,disk brakes prob.best,cantilevers OK,but require TLC and mounting studs.Front drumbrake+dynamo (SA) fine too but not so hot in mountains (overheating).On the flats it does not matter all that much but you don't want any Chinese stuff.I wouldn't trust their cantilevers either,unless I could give them the third degree first.Please don't be stupid.
     
    Last edited by a moderator: Jul 13, 2009
  12. Turtle Tedd

    Turtle Tedd Member

    thanks for the input..Del Mar does have a steel frame..rest of the bike is **** but I am changeing out parps as fast as I can learn which ones to buy Icyuod2 I thought about what I read in your post this morning..that back wheel lossened up just enough to let one of the bolts bang into the coaster brake arm..didnt see any dings or radicalgoobers on any bolt faces but brake arn was soft pot metal..going to cut one out of steel flat bar and replace ...make sure I get some good clearance....wheel is spinning and brake is working it is off bike now ...will take more time getting it on the bike straight..since I did take plenty of time to get that sprocket perfect..cannot put 12ga spokes on this hub....Think I will buy a wheel with a freewheel hub and the larger spokes...they must be available from the vendors here ...will research it tonight....ANY SUGESSTIONs ....Duivendyk what are the best canterleiver brakes?? put a china one on front but it is junk...been getting stuff at the bike shops locally...probably not a good Idea since I do not Know the brand names of the quality parts...will get a good set for the back also..will run this wheel and not use the coaster brake to much until I can figure out what to buy...typing skills primitive..keep hitting the wrong keys ..Kinda hard typing watching tv drinking beer smoking cigs and pretending to listen to the wife at the same time ..will not be chewing gum.
     
    Last edited: Jul 13, 2009
  13. cspaur13

    cspaur13 Member

    i had the same problem. turned out the dust cover thing broke and cause the brake arm to move around and it broke.
     
  14. Turtle Tedd

    Turtle Tedd Member

    Ordered a new rear wheel today,,heavy ss spokes,Shimano coaster brakes...think I will order a larger sprocket to get btter low end tourque,do not care about high top end......old wheel rebuilt,,will run it until
     
    Last edited: Jul 18, 2009
  15. Now would be a good time to install a nice drum brake hub with oversized spokes.
     
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