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Brake issues

Bikeuser2

Bikeuser2

Chimp
Oct 26, 2024
3
0
Hi
I have tektro tkd88 brakes on my mountain bike, they are not great but I want to learn how to use them the longest possible.
And find out what is wrong with them

I bought the bike used so I am not sure of past use, and I habe tried bleeding 5 times before getting to a point where they are starting to work.

I think I have screwed the bleed screw too tight and also I have put a lot of pressure during the process.

So when i follow the pdf, using a recipient on top, when i unscrew seringe on the bottom fluid comes out before I can replug it with the bottom screw. Why this screw is not like on cars I do not understand sonce it works great on my car.( yes you can fill and screw in at the same time)


So I have better results loading from the top but I have to engage the brake lever fully and apply huge force on the seringe to make the lever go back out, then I remove the seringe and loose a lot of fluid and put the screw back in.
And the result is just ok.

I cant understand why this process is so difficult and the result so bad, any advice can help me thanks
 
Jm_

Jm_

sled dog's bollocks
Jan 14, 2002
20,040
10,603
AK
Bikeuser2 said:
Hi
I have tektro tkd88 brakes on my mountain bike, they are not great but I want to learn how to use them the longest possible.
And find out what is wrong with them

I bought the bike used so I am not sure of past use, and I habe tried bleeding 5 times before getting to a point where they are starting to work.

I think I have screwed the bleed screw too tight and also I have put a lot of pressure during the process.

So when i follow the pdf, using a recipient on top, when i unscrew seringe on the bottom fluid comes out before I can replug it with the bottom screw. Why this screw is not like on cars I do not understand sonce it works great on my car.( yes you can fill and screw in at the same time)


So I have better results loading from the top but I have to engage the brake lever fully and apply huge force on the seringe to make the lever go back out, then I remove the seringe and loose a lot of fluid and put the screw back in.
And the result is just ok.

I cant understand why this process is so difficult and the result so bad, any advice can help me thanks
Click to expand...
I have no idea how these work and I saw your post on MTBR.

Do they work like Magura, where you have two syringes and a bleed port at both the lever and the caliper, but no actual valve to close the lower port?

What I did was start with the two syringe method, working the fluid back and forth, sucking out the bubbles, then, I pushed most of the fluid into the top syringe, to basically pop off the top (make sure you have enough fluid to do this) and then I removed the lower syringe, let it run out while I plugged it, but it didn't introduce any bubbles because I already sucked the bubbles out and it's just gravity flowing from the top syringe, which is now just serving as a "cup". It was either that or use maguras stupid "get the caliper above the lever" technique, but that seems likely to still introduce bubbles.
 
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