Honda CB750 Front Brake Master Cylinder Rebuild | Motorcycle Weak Brakes Fix | Part 24
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- Опубликовано: 17 окт 2021
- Honda CB750 Front Brake Master Cylinder Rebuild | Motorcycle Weak Brakes Fix | Part 24
In this Honda CB750 rebuild episode, I rebuilt the front brake master cylinder on my CB750 project bike. I am building this bike to be a road-going runner, not a full restoration.
Here's what I used in this video:
Honda CB750 front master cylinder rebuild kit: ebay.us/ho3KbT
Oil Syringe Pump Brake Bleeder: ebay.us/pM4MJE
Circlip Pliers: ebay.us/HewSNq
Small Pick Tools: ebay.us/j8uDjF
Although the master cylinder on my Honda CB750 project bike wasn’t leaking and did seem to bleed up OK, the front brake was still very weak.
It was suggested that, although not leaking externally, maybe the master cylinder was leaking internally preventing it from giving maximum braking pressure.
I decided to rebuild the master cylinder with a kit so that this wouldn’t be a possibility.
The inside of the master cylinder did contain a lot of congealed brake fluid and there was some corrosion, so a rebuild was a good idea. I tried the reverse filling of the brake system to make bleeding simpler. It surprised me how quickly the fluid came through, and I had a little fountain of brake fluid. I did finish off with some traditional bleeding.
If the brake performance isn’t better I think I will replace the brake lines next. If that doesn’t work then I may have to consider fitting a second disc and caliper and just accepting that the Honda CB750 stock single caliper and disc setup just doesn't cut it by modern standards.
For more helpful how-to guides and restoration project logs, visit our blog: www.spannerrash.com/
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Thank you, I'm doing this exact job tomorrow, it was great to have a look at what to expect before I do, cheers.
Glad it helped. It isn't too bad a job, once you get into it. Good luck.
@@SPANNERRASH All back together, thanks, Happy New Year, cheers.
@@ivanwalker6459 Great stuff Ivan, happy new year to you too!
@@SPANNERRASH All back together, thanks, and happy new year, cheers.
Coffee? That job needs some Yorkshire tea! Good work.
Haha cheers James, and tea probably would be more appropriate all things considered 😂
I've been watching your videos for some time, on a variety of items, and just have to say your temperment for these sorts or repairs is wonderful. It's so helpful for everyone doing these same reapirs, and a valuable resource. It's also very soothing to watch you work!
Thanks for that! We always find it helpful to see how someone else approaches a job and enjoy watching what they get up to.
Great job!!! And no coffee was spilt during the making of this video!! : )
Cheers! Only thing spilled was a bit of brake fluid, so no big deal. 😂
I'm having the same issue of a soft brake, which a fresh brake bleed did not fix. I ordered a kit and may see about a braded line as well. By the way, I really like the shirt you wore in this video!! Brett from Florida, USA
I love that Tee, but it is getting a little threadbare now :( It's annoying when a disk brake doesn't stop as well as a drum, but just wait until it starts squeeking, that is an even bigger problem to solve.
Put some coffee in that milk lol Thanks for the vid, very helpful
Good call! But young gun is trying to wean me off Coffee! Glad the video was helpful.
Great job. You have a nice relaxed way of working which I enjoy. Also no desire to make the CB 750 look factory new which I like and retains the bikes history, warts and all. Thanks and keep up the good work
Thanks for the kind words Chris, I really appreciate that.
I do prefer to resurrect bikes rather than restore them.
I hope you got the brake fluid of the tank!
I wiped it off between the shots after the surprise fountain! No damage done to the paint :)
Hi ,from Newzealand how critical is that silver split ring . My mastercylinder on my k5 didnt have 1 .
No, it isn't critical.
It makes sure the dust seal works better, but the master cylinder will work just fine without it. I suspect very little dust would get in there unless you are using the bike a lot in a harsh environment.
I wouldn't worry about it if it was missing, but I would fit it if it was there. Hope that helps.
Same problem with my CB750. Did this fix the issue?
The brake is nice and firm now. It solved the problem of virtually no power, but it still isn't as strong as a modern brake. I would really recommend using the braided line.