Author Topic: Whoa! Rear Brake assembly BROKE! (Read 3159 times)

Kev Nemo · « **on:** November 20, 2008, 06:00:04 AM »

So my rear chain was loose and I ran it by my friend's shop for an adjust before I rode out 60 hwy miles to school. He informed me that the chain was stretched to it's limit and he'd adjusted as far back as possible. So I take off and at the first stop sign, the rear locks up. He comes down, adjusts the back brake, and I'm off. Back and forth to school, no issue, although the rear brake felt 'funny'.

The next day, back to school. I-35 is a major corridor for 18 wheelers and commuters, ie. tons of traffic. Get through that and into San Marcos, which is full of kids with their first cars-get through that. Come up Sessum, a notoriously windy road that is tons of fun to tear up-make it past that.
PULL INTO THE PARKING LOT, press in the back break, feel the pedal 'pop' back against my foot. Stop and look at the back- The entire brake arm assembly had broken off, including the steel rod spline that goes into the drum which had snapped in half!

Here's a pic for reference (red square indicates what snapped)

Needless to say, I was towed home. Has anyone ever had this happen?

moham · « **Reply #1 on:** November 20, 2008, 07:14:42 AM »

Yes.

On my 750, I somehow missed installing a new cotter pin on re-assembly at the point where the brake "hub" attaches to the frame via nut/bolt. The nut wiggled loose, then off, went pinging through the spokes at 50 mph, at which point I tapped the brakes. And with nothing to hold the brake mechanism to the bike, wrapped the brake rod, brake arm etc around the back wheel and sheared the brake cam nearly in two. I was slowing considerably by then and the back wheel did not lock up. I pulled off the road and after looking at it for a minute figured out where I went wrong. I still don't know how I missed the cotter pin but I can tell you I won't miss another one.

goon 1492 · « **Reply #2 on:** November 20, 2008, 09:47:02 AM »

I am just getting to repair mine, I'm not sure of the mystery of mine but here's a pic of the old with the new i got from OKC on here, there was another person that was willing to sell theirs. I can't remember his name off hand, but if you ask around someone I would imagine has those parts to sell. I can give you the old spring, nut and brake lever barrel (that's what the rod goes thru) that came with the parts I got from OKC if you pm me your mailing address. I didn't need these because I ordered all new stuff from hondapartsdirect, the only things they didn't carry anymore was the brake lever and the rod. I;'m not sure about the cam if they carry one or not, I need one of those soon but mine isn't broken yet.

goon 1492 · « **Reply #3 on:** November 20, 2008, 09:48:25 AM »

Opps forgot to add the pic....

Kev Nemo · « **Reply #4 on:** November 20, 2008, 10:13:52 AM »

wow-I think it's scarier that it happened to other people! $:-\$

Patrick · « **Reply #5 on:** November 20, 2008, 10:35:53 AM »

Hey Kev. If you are looking for replacement parts I might have some out in one of my bins of old 750 parts. The big advantage for you is I am north of Pflugerville near Hutto. PM me your phone number and we'll see if we can get together and dig around in the bins.

Patrick

754 · « **Reply #6 on:** November 20, 2008, 01:41:20 PM »

Sounds ;like the bolt came off the front of the torque arm first..(red square near motor).. which pretty well results in what happened..

otr are you saying the end pulled out of the flat torque arm?? smaller bolt may lead to that..

See you have Hookers, ran them myself for a long time..

moham · « **Reply #7 on:** November 20, 2008, 01:54:46 PM »

Quote from: 754 on November 20, 2008, 01:41:20 PM

See you have Hookers, ran them myself for a long time..

A used set of Hookers just went on ebay for ~$70, would have bought them but I just bought the NOS S&S a couple weeks ago...

ralt12 · « **Reply #8 on:** November 20, 2008, 02:28:45 PM »

I have an extra brake assembly, not perfect, from a '75 550, if you need one...

moham · « **Reply #9 on:** November 20, 2008, 03:28:23 PM »

Quote from: ralt12 on November 20, 2008, 02:28:45 PM

I have an extra brake assembly, not perfect, from a '75 550, if you need one...

I'm pretty sure the early 550 set-ups are a different dimension (smaller) than the 750's. I might be wrong.

Kev Nemo · « **Reply #10 on:** November 21, 2008, 07:40:06 PM »

Quote from: 754 on November 20, 2008, 01:41:20 PM

Sounds ;like the bolt came off the front of the torque arm first..(red square near motor).. which pretty well results in what happened..

otr are you saying the end pulled out of the flat torque arm?? smaller bolt may lead to that..

See you have Hookers, ran them myself for a long time..

Nope, the bolt was still there-the torque arm broke off it! I was thinking of replacing the torque arm/brace with a piece similar to Carpy's finned jobs:http://www.cb750cafe.com/parts.php?id=58, but drilled out with a few speed holes.

goon-which page on Hondapartsdirect has the spline? I'm going to try and get some pics of the broken pieces..

754 · « **Reply #11 on:** November 21, 2008, 07:56:00 PM »

Did it have the correct shoulder bolt in there or a regulat bolt with threads , where it contacts the torque arm?

heffay · « **Reply #12 on:** November 21, 2008, 11:12:18 PM »

U HT DA BREAKS 2 HARD

Kev Nemo · « **Reply #13 on:** November 23, 2008, 06:45:35 PM »

Not really-I swear!

BlindJoe · « **Reply #14 on:** November 23, 2008, 07:10:34 PM »

Yep, same thing happened to me, mine was even more twisted than the one in goon's pic, narley

. At first I thought that a rock or something had jammed up under my brake pedal when it popped up, definitely not something i'd want to happen again.

cb750k7 · « **Reply #15 on:** November 23, 2008, 08:51:40 PM »

Quote from: KottkeHead on November 23, 2008, 07:10:34 PM

Yep, same thing happened to me, mine was even more twisted than the one in goon's pic, narley . At first I thought that a rock or something had jammed up under my brake pedal when it popped up, definitely not something i'd want to happen again.

Hi,

Same thing happend to me http://forums.sohc4.net/index.php?topic=39211.msg405851#msg405851 but luckily just sheared the cam.
Ended with replacing the cam. (DSS parts)

Good luck.

goon 1492 · « **Reply #16 on:** November 24, 2008, 06:49:10 AM »

Kev are you talking about the brake cam? I'm not sure if hondapartsdirect carrys them if that's what your asking, mine is alittle twisted but there is no cracks so I am going to reuse it, I was wondering if I could replace mine if I needed. Looks like cb750k7 has a link to DSS with it or cmsnl.com

Soos · « **Reply #17 on:** November 24, 2008, 10:49:33 AM »

Quote from: Kev Nemo on November 20, 2008, 10:13:52 AM

wow-I think it's scarier that it happened to other people! $:-\$

just another reason to swap to disk rear brake.

l8r

cb750k7 · « **Reply #18 on:** November 24, 2008, 11:34:35 AM »

Quote from: goon 1492 on November 24, 2008, 06:49:10 AM

Kev are you talking about the brake cam? I'm not sure if hondapartsdirect carrys them if that's what your asking, mine is alittle twisted but there is no cracks so I am going to reuse it, I was wondering if I could replace mine if I needed. Loode like cb750k7 has a link to DSS with it or cmsnl.com

DSS:
Rear brake Cam
Make: Honda
OEM#: 43141-341-020
Product#: 43141341020

Kev Nemo · « **Reply #19 on:** November 24, 2008, 05:53:44 PM »

Quote from: goon 1492 on November 24, 2008, 06:49:10 AM

Kev are you talking about the brake cam? I'm not sure if hondapartsdirect carrys them if that's what your asking, mine is alittle twisted but there is no cracks so I am going to reuse it, I was wondering if I could replace mine if I needed. Looks like cb750k7 has a link to DSS with it or cmsnl.com

yep-the cam snapped in half! Pretty damn crazy,huh?

moham · « **Reply #20 on:** November 24, 2008, 08:27:35 PM »

Dude, I don't know the price on David Silver but it's gotta be cheaper from one of the dealers. $28.00+ should be the average. Silver has got to be more than that if only due to exchange rate+shipping. Try Western or Discount or Powers or...

Better yet, if you need more than just the cam, find one of our stellar members that's got a spare rear wheel lying around and harvest what you will...

Kev Nemo · « **Reply #21 on:** November 25, 2008, 07:25:56 AM »

Yeah-I'll probably go that route...

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Author Topic: Whoa! Rear Brake assembly BROKE! (Read 3159 times)