Rear brake problem.

iamdjdz

iamdjdz

iamdjdz

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24 Nov 2006
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I've a problem with the rear brake on my 125. It keeps loosening so that I have to push my brake lever a lot further down before the brakes go on at all. Out of personal preference I'd prefer them to be higher up. (bike's a roadster type, skeletal frame Superbyke-125-4) The nut's one of those U-shaped ones from a side on profile (haven't a clue of the name) and it just loosens itself whilst I ride.

Does anyone have any advice on what I can do to keep my brakes tight? The only real idea I had was to screw a nut on behind the adjustment one and see if that kept it tight?

Cheers, and sorry if that doesn't fully make sense I don't know the names of all the parts lol.
 
Fireskull said:
Can you take a picture of whats loosening? might be easier to give advice then, dont want to say try something etc when brakes are concerned :p
Click to expand...

Yeah no probs. It's basically just a nut that tightens along a bar to tighten, or loosen the brakes. My bike's pretty rubbish to be honest but I knew I'd be riding about on L plates for ages before I got my test and thus nearly a year later (and 5000 miles) I have my manouevers test booked for friday!

I've also got a carpark to test changes on so I'm not on the road if anything goes wrong.
 
Can you not get a second nut to lock the 1st one in place?

That's how the rear brake on one of my bikes is adjusted, tighten the 2nd nut into the 1st to lock it.
 
They should have a second nut wound up against the first to lock in place, this is the reason they are so cheap no locking nuts / washers and I assume your saying it has a drum rear brake, is it from the 80's?
 
maccapacca said:
They should have a second nut wound up against the first to lock in place, this is the reason they are so cheap no locking nuts / washers and I assume your saying it has a drum rear brake, is it from the 80's?
Click to expand...

Possibly drum brakes, but highly unlikely.

the bike is a chinese bike (CBR 125 Replica I think)

The chances are it's a disc, but with a rod pushing into the master cylinder to operate the brake
 
Wyvern971 said:
Possibly drum brakes, but highly unlikely.

the bike is a chinese bike (CBR 125 Replica I think)

The chances are it's a disc, but with a rod pushing into the master cylinder to operate the brake
Click to expand...


The SB125 still has a rear drum I assume this is based on a CG125 the rest have rear disc, I've just looked at my Varadero and the bar that pushes the cylinder has no adjustment and if the pedal were to drop down that would mean the piston is being pushed all the way up, have you run out of brake fluid?
 
Wyvern971 said:
Possibly drum brakes, but highly unlikely.

the bike is a chinese bike (CBR 125 Replica I think)

The chances are it's a disc, but with a rod pushing into the master cylinder to operate the brake
Click to expand...

Spot on, well as far as I've been told.

It never had a 2nd nut, now excuse my absolute mechanical retardedness but what would I need to ask for to get one? (It's a 13mm nut in the first place) I thought about a second nut but would this stop it constantly loosening?
 
Basically it's not the head size, but the thread of the nut that determines which nut to use.

Tightening a nut against another on the same bolt (or rod) means that they do not move.

Best bet, take the existing nut off, go to B&Q or some other place that you can get hardware from and get another nut that matches thread.
 
Apparantly it is drum brakes.

Here are two pictures I've just taken. (the bike's a rust buscket btw, I've cleaned her up a lot since I got her but she's always been rusty)

dsc01194n.jpg


dsc01193dw.jpg


The rust looks worse than it is :D

Basically the brake pedal when pushed in pulls the black rod that is attached to the drum. The nut on it is at the loosest that it goes, it can be taken off but it won't loosen any more. This means that the travel on the brake pedal before the brake goes on is far. I want to tighten it up so that there is less travel and I can stop quicker pretty much. Also it feels better when you can put the same amount of pressure on front and rear and get the same amount of brakes.
 
Excuse the above saw before pictures the nut has a half circle cut into the front end that locks it in place and the spring holds it all together, the spings either knackered or the whole thing is loose, another nut wound onto it would do as a temporary measure but it could mean your shoes are low and its on it's final adjustment
 
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