Team-BHP - Disc Brakes not working fine

Hi,
I have a Bullet Electra ES with company fitted Disc brakes. For the last few months I am facing problem with my disc brakes. The brake liver is not fully functional, means when pressed the liver does not come back fully. Because of this I think the brake also touches the disc and the movement of front wheel doesn’t go freely after the brakes are applied. I have tried changing the oil also but it was of no use.

Any help regarding this would be of great help. please:

Quote:

Originally Posted by bblost (Post 1375708)

Looks like you got air inside the brake line.
You need to bleed the brakes.

btw, who changed the oil?

The brakes when pressed, works fine.... but does not go back fully...
Me myself replaced the oil... also cleaned the Disc with petrol/oil before fitting it back.

What do you mean by "You need to bleed the brakes" ?

If you did this:

Quote:

Originally Posted by tarunmadhok (Post 1375723)

Me myself replaced the oil

You should know what this is:

Quote:

What do you mean by "You need to bleed the brakes" ?

Did you just drain the brake line and then add the brake fluid?

Also brake fluid is not oil.

Quote:

Originally Posted by Spitfire (Post 1375740)

If you did this:

You should know what this is:

Did you just drain the brake line and then add the brake fluid?

Also brake fluid is not oil.

I know Brake fluid is not oil. in other words here in north it is also known as brake oil, so used oil word. I had drained all the oil (in your words fluid) before adding new one.

Tarun. Bleeding a hydraulic setup is very important.

Even a tiny pocket of air will cause issues with the brake.
This is primarily because the disc brake works by compressing the oil and pushing it against the brake shoes.
When air is present in the system this compression will not happen.

However you mention that the brakes engage fine. But do not disengage fully.
If that is correct, I would suspect a faulty spring and/or air pockets bled brakes.

Since brakes are one of the most crucial parts in a bike, I suggest you get a mechanic to look at it.
Do not simply go to any mechanic but rather find one with experience in disc brakes.

did you make sure you removed all the air from the setup cause if you even have a small bubble the brake would not work the way they should. get it done from some one good in Chnadigarh. i am sure that Dana would be able to do it.

Quote:

Originally Posted by desideep (Post 1375785)

Air was fully removed from the Disc before i added the new Oil. Please get me the Address of Dana.

Quote:

Originally Posted by bblost (Post 1375822)

Can you please post the procedure you used to do the same?

Well it was done by my big bro who is a tech person (has done mechanical engineering). Can anyone tell me step by step points for bleed and i will redo it this sat/sunday.

http://www.team-bhp.com/forum/techni...-bleeding.html

Quote:

Originally Posted by bblost (Post 637751)

This Sunday, I found myself with a bottle full of DOT3 oil and some time.
The DOT3 was bought a couple of week’s back, but that day my mechanic's shed was closed.
I had been looking at the dot3 and thinking how to go about refilling my bikes disc oil.

I opened the main container and topped up the oil.
The brake was working fine.

The devil crept up my ear and kept reminding me that old oil is looking old.
Decided to bleed the brakes.

Opened the nipple cover and set up the spanner for the valve.
press brakes three times
HOLD
open and close the valve.
Repeat the above.

complete loss of pressure in the brakes.
spent more than 4 hours trying to get the air out.
The valve was spitting out oil as expected but still no pressure.

finally went to the mechanic, Monday morning.
took him half an hour to fix it.

what I was missing
the hydraulic pump, needs to be opened up.
springs et all removed, flooded with oil and closed.
voila the brakes work fine now.

What I learnt.
riding a bike without brakes is more fun.cheers:

Hi, I have a electra ES/Disc 2006 model, now from some time I was facing some problem with the Disc so I opened the Master cylinder to clean it, then i noticed that the Piston which the brake lever moves was a bit hard in moving. so i removed all the brake oil and cleaned the cylinder with Diesel but still the piston is not moving freely and moreover some white fluid is coming out from piston area. Can anyone help me out in fixing this issue? any one knows how to removed the piston from the master cylinder? as then it could be cleaned.

Or can advice any good Disc Mechanic in Chandigarh?

I have found a Master cylinder pic from the net, which will make things more easy to be explained.

Advice/help are welcome...

Thanks,
Tarun Madhok