The bleed kit for my Tekro HDC 330 hydraulic brakes did not come with a bleed block. I've seen a 15mm ring spanner mentioned as a suitable alternative, but would prefer to make/buy the correct tool.

What size/thickness of block is needed?

  • 1
    What model of brake do you have? May 2, 2017 at 17:06
  • 1
    Fwiw I've always just used a Shimano one held in place with a rubber band. They fit snug and that's all you really care about. May 2, 2017 at 17:59
  • @CardMechanic Good point, I have edited the question to include this.
    – LC1983
    May 2, 2017 at 18:05
  • @NathanKnutson Thanks, if I do not get the answer I will try a Shimano one.
    – LC1983
    May 2, 2017 at 18:07
  • 1
    Get an old credit card, cut it up to pad shaped bits and superglue enough bits together to make the thickness you need.
    – mattnz
    May 2, 2017 at 21:23

2 Answers 2


This model of Tektro brake uses a Shimano M575/M505/M445 brake pad - so I ordered the Shimano bleed block for these brakes (p/n Y8FZ05000) which did the job.

  • Thank you for coming back and letting us know what worked. Closure is important, and appreciated.
    – Criggie
    May 12, 2017 at 22:14

I have a hydraulic piston press, and it's 3.7mm thick. I don't know if that's a standard across the board or if it's just this one though.

  • Is that for pushing the pistons back in? Or preventing them coming out when the lever is pressed?
    – LC1983
    May 2, 2017 at 18:06
  • Come to think of it, it's probably for pushing them in. So it would be wrong for your use. Sorry, hydraulic disc is my weakness May 2, 2017 at 18:11
  • No worries. I could do with one of those, rather than making do with a big screwdriver.
    – LC1983
    May 2, 2017 at 18:12
  • Would you mark an answer for this question please? Just to get it out of the "unanswered" queue? If the answers here don't answer it, please just post an answer yourself that does and mark that as the correct one. May 12, 2017 at 20:21
  • Thanks for the reminder - I was waiting to measure the block before answering, but will edit the answer once I have measured the block.
    – LC1983
    May 12, 2017 at 21:38

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