What is wrong with my scooter brake?
After replacing the brake shoes, I tried to bleed my brakes yesterday. The problem is: only a little brake fluid came out at the bottom at first, then nothing at all. No matter how hard or for how long I pumped, hardly any fluid came out. There's hardly any pressure on the brake lever, and you can only really pump when you're very close to the handlebars.
Anyone have any ideas? Is the entire brake lever/cylinder broken?
Many thanks and best regards!
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Why do you actually ventilate the brake if you only changed the load?
First of all, check whether the cylinder on the brake lever actually returns over the full length.
Discharge valve, activate brake, release vent valve, release brake. In the case of two-wheelers, gravity helps as if it were not absolutely necessary to close the system when releasing, but if it does not want it might be necessary.
There was no pressure on the brake. Only after changing the documents was even less on it, so ventilate the brake?!
“Activate the vent valve, activate the brake, release the vent valve.” That’s how I tried this a few times yesterday, without a sign of improvement.. How long does it take? Shouldn’t you see at least some brake fluid?
“In the near future, check whether the cylinder on the brake lever actually goes back over the full length.” The cylinder hangs on the container with brake fluid if I understood it correctly? Do you mean the part that is “pressed” by the brake lever?
Thank you.
Because of poorer/abused loads, one usually has a back pressure when the brake is actuated. So there was probably a problem before the change of the coating, because the change of coating has only made this even stronger.
After changing the lining, the brake pistons have to be moved out again so that the linings rest again. Probably but does not even work on the brake.
That’s the part on the handlebar that’s pushed in with the lever, I mean. Is that coming back? As I do not seem, if it does not come back completely, no fresh brake fluid can run out of the storage container, cannot vent and also does not bring the brake piston back.
Then you have to do this first. If the part does not go back completely, no fresh brake fluid can go after and it will never be what.
You will probably have to completely remove, disassemble and clean the brake lever.
It’s coming and I don’t think I’m coming back. I think because the brake light has always been lit because the brake lever has not gone far enough. The “sealing” on the cylinder(?!) is also a bit rusty..
This means that the liquid must also be refilled. The simplest one is to snuck up the lid first and look in. If necessary, then fill in one or two with the lever pump and always control the sufficient liquid in the container. Otherwise, the member goes wrong. the compensating container was always filled to mndestends of half.
but that fits very little into it is a bit more difficult to do that.
Machiker has written to check the piston / brake lever path, unfortunately not like. the lever should generate pressure or pressure when sufficient fluid is in it. no pressure build-up is now air ím system. First, therefore, refill and at the bottom open valve max two three times pump valve to and refill. Important or as a tip: The valve only opens to the extent that the liquid just gets out because if s is too far open the vent hose or the valve could pull air again at the valve.
This is what makes a hose connection between the vent valve and the compensating container. Then you are pumped in a circle and until the brake fluid leaves bubble-free.
Brake fluid should be replaced all two years ode better earlier, up new refilling and pumping through to clean down. In the case of two-wheelers there is usually a half-liter for cars at least one liter.
Thanks for the answer. The problem is, however, that the liquid in the balancing container is not really less and therefore probably also arrives nix below.
Brake venting is one of the most difficult workflows in that I have already seen the most exhausted professionals with the best tools on it fail. Who knows what you did. Probably just pulled in more air through some Newbie mistake.
Very constructive answer, thank you 😉
The scooter is not worth the world and there was no pressure on the brake before, I tried my luck, now I’m looking for help, such comments don’t bring me any further..
Of course, you have to describe expert in detail how you’ve been doing exactly. No one can read thoughts here.
I put a hose over the venting screw, then screwed the screw, brake lever tightened, screw to, brake lever released etc. At the beginning about 2-3 cm liquid stood in the hose. Then I repeated the whole thing and it was no longer. So googled in and for hours and tried out a variety of things. End of the game: At the bottom there was no more liquid…
Since my brake lever is already very loose and hardly any pressure on it, I thought it might be. Maybe you could tell me how to check my brake lever for operability. How I can proceed 🙂
That’s how you do the right thing!
https://www.louis.de/rund-ums-motorrad/raubrtipps/ Bremskloetze
https://www.louis.de/rund-ums-motorrad/screwrtipps/brake fluidity
https://www.louis.de/rund-ums-motorrad/screwrtipps/brake lock
Is there any brake fluid in it?
No, of course, has been refilled