little bit of help please ?

hi guys this is my front brake master cylinder and it was showing almost full other day and now its like this am wondering if its gone down due to wear on the pads because there is no leaks coming from anything that connects it

 

check your pads ad see if they are low

 

Already had some air in the system?

 

pads will cause a small drop in the level as the stationary position of the piston is out further,but for that amount I wouldn't think it could cause that level of drop,you have checked the caliper and the pipe for any leaks?

 

top the fluid level up, keep a check on it over the next days. If it drops again you have a leak.

 

possibly when you checked it before the bars were at a different angle making the res look fuller. As said above, top it up and keep an eye on it if theres no visible leaks anywhere in the system