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Oh lord! more Hydraulic disk brake questions...

Old 11-19-20, 10:49 AM
  #1  
benjamin163
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Oh lord! more Hydraulic disk brake questions...

Hello,
I've been trying to fix my front disk brake.
The pads aren't engaging. the lever goes all the way to the bar.
I've performed a full bleed.
I've put in new pads.
While the spacers are in everything feels like it will work, but when I take them out and put the pads in and the wheel on, the lever goes all the way down and the pistons aren't finding the pads.
After many attempts at this, I'm guessing the brake is a gonner and has an air leak somewhere.
But I'm wondering if there's a way of confirming this.
Secondly, if it is a gonner, it's a tektro HDC 300 and I can't seem to find anywhere that sells it. I don't know if it's just too old or something. My question here is does it matter if I have a different front brake to back brake? Should I get a new set?
And my third question is, if it's a resounding "YES IT DOES MATTER!!!", what is a good set of cheap, hardwearing disk brakes that I can put on my everyday commuting bike? An d what do I have to look out for with compatibility issues with the frame, disk size etc.
Any help gratefully received.
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Old 11-19-20, 11:48 AM
  #2  
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Originally Posted by benjamin163 View Post
Hello,
I've been trying to fix my front disk brake.
The pads aren't engaging. the lever goes all the way to the bar.
I've performed a full bleed.
I've put in new pads.
While the spacers are in everything feels like it will work, but when I take them out and put the pads in and the wheel on, the lever goes all the way down and the pistons aren't finding the pads.
After many attempts at this, I'm guessing the brake is a gonner and has an air leak somewhere.
But I'm wondering if there's a way of confirming this.
Secondly, if it is a gonner, it's a tektro HDC 300 and I can't seem to find anywhere that sells it. I don't know if it's just too old or something. My question here is does it matter if I have a different front brake to back brake? Should I get a new set?
And my third question is, if it's a resounding "YES IT DOES MATTER!!!", what is a good set of cheap, hardwearing disk brakes that I can put on my everyday commuting bike? An d what do I have to look out for with compatibility issues with the frame, disk size etc.
Any help gratefully received.

I know you stated you fully bleed the brakes, but I would suggest before giving up to burp the brakes. Burping will help get rid of any air and it's possible you just don't have enough fluid in them.


If you decide to replace, what's your budget? The 300's from images I see, don't appear to be much different than the Tektro M275's and those can be found for sale.

Or if you are up to it financially, replacing both brakes for a matching Shimano BR200's might be a bit more affordable and depending who you speak to a better brake.
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Old 11-19-20, 12:06 PM
  #3  
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Originally Posted by travbikeman View Post
I know you stated you fully bleed the brakes, but I would suggest before giving up to burp the brakes. Burping will help get rid of any air and it's possible you just don't have enough fluid in them.

Tektro Soft Lever Fix

If you decide to replace, what's your budget? The 300's from images I see, don't appear to be much different than the Tektro M275's and those can be found for sale.

Or if you are up to it financially, replacing both brakes for a matching Shimano BR200's might be a bit more affordable and depending who you speak to a better brake.
Fantastic thanks so much for your response, I will try the burping for sure.
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Old 11-19-20, 02:07 PM
  #4  
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I burp my brakes on a somewhat frequent basis. Shimano brakes are very easy to do -- because Shimano uses the funnel. You just fill the funnel with a little bit of fluid, snap the brake levers a bunch of times until bubbles stop appearing, and you're done. It's very quick, clean, and easy to do.

If you do end up deciding to replace your brakes, Shimano M315s or MT200s are good, high value hydraulic disc brakes.
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Old 11-19-20, 06:51 PM
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ARider2
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If you buy the Shimano Alivio BL-MT200/BR-MT200 Disc Brake and Lever it comes with new brake pads and is already pre-bled which makes installation a breeze as no bleeding is needed and they are an overall great value. You can get the front or the rear (longer brake hose).
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Old 11-20-20, 10:53 AM
  #6  
gsa103
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Originally Posted by benjamin163 View Post
Fantastic thanks so much for your response, I will try the burping for sure.
The other thing that can really help with burping the brakes is un-bolting the caliper (especially the rear). Moving the caliper around prevents air bubbles from being trapped in strange places inside the caliper.
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