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All of a sudden, no rear brake

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All of a sudden, no rear brake

Old 02-19-13, 02:08 AM
  #1  
NZDoug
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All of a sudden, no rear brake

Then I shortened the cable at the back end, and it worked for 1 ride, then no brake.
The front brake works so that keeps me safe, but, need to fix.
Im not familiar with disc brakes on bikes.
One day, good brakes, next day, brake feels like it greased, negligable braking.
No slow deterioration.
Great to crap in 1 second.
Looked at utube but not sure of my brake system.
2005ish GIANT IGUANA
any suggestions as I dont know how to adjust or trouble shoot disc brakes.
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Old 02-19-13, 02:33 AM
  #2  
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A few of possibilities, The cable outer should be full routing, but if not, has the cable come out of the guides? is the cable still attached / firmly bolted to the caliper arm? do the pads still have any material on them, are the rotor / pads contaminated?

Why did the cable need to be shortened, if they had worked at that length for 7 years, why the need for change now?
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Old 02-19-13, 02:36 AM
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Originally Posted by NZDoug View Post
Then I shortened the cable at the back end, and it worked for 1 ride, then no brake.

I dont know how to adjust or trouble shoot disc brakes.
Prolly shouldn't have messed with it before figuring it out then. At least it was the rear...

Did you shorten both the cable and housing? And you haven't mentioned any observations - examine the cable and look for problems; they can't even hide from the blind. Is the clamp bolt loose? Has a cable stop broken? What is it?

If the cable is secure and works smoothly and you can grab the brake hard without it working well, you almost certainly have got some sort of oil on your rotor.
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Old 02-19-13, 02:44 AM
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what brand and model number are those brakes? Bikepedia says a 05 Giant Iguana has Hayes HMX-2 Mechanical Disc brakes, Avid FR-5 levers.... is that correct?

if it is, here's the mechanical sheet on those... https://www.hayesdiscbrake.com/wp-con...EnglishWeb.pdf

all mechanical disc brakes work pretty much the same. cable pulls lever, lever turns a cam, cam squeezes the brake pads into the disc rotor.
is the cable connected, and when you squeeze the brake lever, the little lever moves on the brake caliber ? i'm guessing the cable came unhooked or something

operate your front brake while watching it closely, then operate the back brake and examine it... if the lever seems to be working properly, remove the pads and see if they both still have brake stuff on them.
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Old 02-19-13, 04:28 AM
  #5  
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Has to be something with the cable. Either it's slipping at the clamp, or the casing is collapsing somewhere, or it's fraying and pulling apart in the middle - in order of probability.
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Old 02-19-13, 10:47 AM
  #6  
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Looking at the disc caliper, can you see the gap between the pad and disc?

can you read the owners manual [online, if not in print?]

not knowing the brake brand/model used means you do the research to find out.
I'm not familiar with disc brakes on bikes.
the Dealer that you bought the bike from should be able to help , did you use the telephone first ?
Ot just go to strangers , here. ?
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Old 02-20-13, 03:23 PM
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Thanks everyone, for your reponses.
jimc101
Cable looks in the guides.
When looking from the rear it looks like there is little or no pad on the inside.(right hand side)
This could be the problem, that is, worn pad on the inside.
The disc feels and looks dry.


Kimo.
By shortening the cable, what I meant was I re clamped the cable with the "squasher bit", clamp end.
A bit of history, I bought the bike used from an Australian guy who brought it over to NZ.
So Im guessing the year.
The is a 10 working day waiting list for dealer service and my bike is booked in this Monday 22/02/13.

Peirce
According to the decals on the actual brake, it says Hayes GX2.
The brake , shifter housing says"Shimano V Brake".
Looking at your link to the pdf, I think pulling the pads is over my head as I dont have the tools, not sure of parts needed, dont know how to adjust etc but will get the lowdown after the dealer fix.


fietsbob
I will give the owners manual a google.
Thanks all.
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Old 02-21-13, 03:56 AM
  #8  
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BEAZUMUR!
Smashed from sprockt guard!
its plastic chromed or nice metallic silver plasticky.
anyhoo, looks buggered.
clamped it over night.
DOH!
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Old 02-21-13, 04:28 AM
  #9  
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Originally Posted by NZDoug View Post
BEAZUMUR!
Smashed from sprockt guard!
its plastic chromed or nice metallic silver plasticky.
anyhoo, looks buggered.
clamped it over night.
DOH!
what did he say??
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Old 02-21-13, 06:14 AM
  #10  
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Originally Posted by pierce View Post
what did he say??
LOL, kimmo do you have pict which part did you cut? did you cut outer casing? or also inner cable? how about your pad still thick?
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Old 02-21-13, 04:25 PM
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Originally Posted by pierce View Post
what did he say??
Translation
Sprocket guard munted.
https://www.amazon.com/s/ref=nb_sb_no...procket+guard+
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Old 02-21-13, 04:29 PM
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That Kiwi Sheep Buggering?
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Old 02-21-13, 11:31 PM
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It sounds like you were down to the end of one of the pads and now its gone. Do the brakes make a scraping sound?
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Old 02-22-13, 02:25 AM
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Hey Onespeedbiker
No sound.
Dealer repair in 60 hours.
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Old 02-22-13, 02:25 AM
  #15  
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Originally Posted by fietsbob View Post
that kiwi sheep buggering?
o.k.
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Old 02-22-13, 03:49 AM
  #16  
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My prediction for the outcome of this issue:

Tektro IO or Similar Promax, Hayes Brake caliper, inner pad has worn enough, and the retaining magnet gunked up enough with ferrous pad material, for the inner pad to fall out. I see it often.

edit: Just noticed hayes gx 2, indeed magnetic retention.

- Joel
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Old 02-22-13, 04:16 AM
  #17  
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Originally Posted by NZDoug View Post

Translation
Sprocket guard munted.
https://www.amazon.com/s/ref=nb_sb_no...procket+guard+
Which has what to do with your rear brake?
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Old 02-22-13, 09:05 AM
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Originally Posted by gilaasepeda View Post
Originally Posted by pierce View Post
what did he say??
LOL, kimmo do you have pict which part did you cut? did you cut outer casing? or also inner cable? how about your pad still thick?
LOL dude, don't ask me, I'm not the OP.

I'm not even the guy you're quoting!

Also, this is pretty cool.

Originally Posted by NZDoug View Post
BEAZUMUR!
Smashed from sprockt guard!
its plastic chromed or nice metallic silver plasticky.
anyhoo, looks buggered.
clamped it over night.
DOH!
PMSL, it reads like some sort of spluttering haiku and makes little sense.

Plastic sprocket guard,
Of nice metallic silver...
It looks buggered now.

I also love how BEAZUMUR seems to be a completely original word

Last edited by Kimmo; 02-22-13 at 09:13 AM.
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Old 02-22-13, 04:41 PM
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This thread is full of all sorts of fail.
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Old 02-22-13, 05:04 PM
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Plus some win.
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Old 02-22-13, 06:25 PM
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Originally Posted by Airburst View Post
Which has what to do with your rear brake?
Shirt happens!
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Old 02-22-13, 06:26 PM
  #22  
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Originally Posted by Kimmo View Post
LOL dude, don't ask me, I'm not the OP.

I'm not even the guy you're quoting!

Also, this is pretty cool.


PMSL, it reads like some sort of spluttering haiku and makes little sense.

Plastic sprocket guard,
Of nice metallic silver...
It looks buggered now.

I also love how BEAZUMUR seems to be a completely original word
Its a cross of "Bummer and Beezlebub, I think.
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Old 02-22-13, 09:05 PM
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LOL, half-suspected as much

...What was the clamping overnight bit about?
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Old 02-24-13, 08:36 PM
  #24  
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Hey Kimmo,
th clamping was my attempt to bend th front sprocket guard back to its original shape.
so I got it back from the dealer.
1) estimate its 4 or 5 years old.
2 ) the bike has a non original front brake.
the front pads were kaput even though they still worked so the padswere replaced
3) the brake levers which you put your hands on when applying brakes were slightly up from level, as apposed to tilting downwards and this pulled the rear brake out of adjustment.

Last edited by NZDoug; 02-24-13 at 09:20 PM. Reason: Spel fix
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Old 02-25-13, 03:37 AM
  #25  
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Originally Posted by NZDoug View Post
the brake levers which you put your hands on when applying brakes were slightly up from level, as apposed to tilting downwards and this pulled the rear brake out of adjustment.
A sure sign the last guy to work on the bike didn't have a clue.
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