Rear brake problem.

[iamdjdz]

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.

 

[iamdjdz]

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

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.

 

[iamdjdz]

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

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?

 

[iamdjdz]

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)

The rust looks worse than it is

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.