sinnerz2000

I've changed my disk pads and brake oil recently and used the bike about a 100km. My disk brake on my uni is not sharp at all, it feels kind of spongy. What could the prob be?

Noor

Query approved

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lijok

Get the brake line checked for air bubble. Sometimes you need to do it multiple times...

Points to note: the dot3/4 brake fluid is corrosive... so make sure you clean the spills without much delay...

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sinnerz2000

How do i do that?

sandeepcf

Does brake lever feel spongy or braking feels spongy?

New pads need some kms to set but your 100km should be enough. do some hard braking in dusty conditions and check. also check for any oily substances and clean.

if lever feels spongy, open the reservoir cap and press the brake hard and hold it. If you see any bubbles there is air in your system, press and hold several times until you see no bubbles.

These are the quick fixes you can try.

Honda_CBF

1. wax & polish the bike before brake service, at least the areas that might get in touch with brake fluid.
2. DONT SPILL BRAKE OIL!!
3. Wash with shampoo & wax it after the service. (even if there's no spill)
4. There is a chance of brake oil coming out of reservoir & drain nut (while service) keep them wiping

lijok

This process, also know as bleeding, is done by opening the drain nut at the brake assembly (the one that is covered with a rubber cap, mostly), pumping the brake lever (the reservoir cap is also opened) so that fluid starts overflowing, then closing the nut, pumping the brake lever... well, thats the sequence that my mech follows.... needs a lot of patience..... you need to keep pumping the brake lever... My mech says when the system is ok, you'll get the hard biting feel when pressing the lever. Once done, just top up the reservoir for all the fluid that has been lost... clean the entire area where the fluid has spilled, preferably with a bottle sprayer etc.

I'd say you better take it to a good mechanic. But it may also be good learning it (which I'm also planning to do, but the sponginess never occurred once I decided to learn ).

IF I am wrong in any of the said facts, please correct me ppl..

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pavanchirmade

Take a look at this

Brakes--> Bleeding/Replacing brake fluid (Yamaha R15)

The process is same for almost all the bikes.

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sinnerz2000

Thanks guys for your help, i'll try doin it myself, my mech tried bleeding it for about half an hour when i changed the pads but i guess he wanted to do it fast so didn't do it well.

haxor

Brakes not bleeded properly,bleed it again!

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