Honda CB750 Front Brake Caliper Strip Down | Using A Grease Gun to Remove a Seized Piston | Part 15
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- Опубликовано: 13 июн 2021
- Honda CB750 Front Brake Caliper Strip Down | Using A Grease Gun to Remove a Seized Piston | Part 15
In this episode, I strip the front brake caliper of my CB750 project bike. I am building this bike to be a road-going runner, not a full restoration. A working front brake is essential for my health and happiness :)
Here's what I used in this video:
Grease gun: ebay.us/ypohP9
Grease nipple: ebay.us/afcp01
Compressor: ebay.us/Q1yndj
The front brake on this bike seems to have had a difficult life. Somebody has replaced the bleed nipple with a bolt at some time in the past. That, a bad paint job, and probably 30 years of not being used meant it was in a bad way.
Taking it off the bike wasn’t too difficult, but when I started to strip it the pads were seized solid. Removing the pad from this side without the piston, involved a little brute force and ignorance with a hammer. But the piston and pad on the other side of the caliper took a little bit more.
Usually, you can use an air gun to push the piston out. But this one was not for moving. Luckily we know the technique that uses a grease gun to remove the piston. You have to make sure you have a grease nipple of the correct thread before you start though.
A lot of pumping was cut out of the video and I was amazed how far the piston flew when it eventually came out. This can happen when you use air, but usually, when I have used grease in the past they don’t come out with as much force in the end. This one was really seized!
Having the caliper apart, luckily the threads seem fine, which is a surprise, and the seal bed for the piston seems to be in good shape too. I expect to be able to rebuild this without too many problems. Famous last words, for the next video.
For more helpful how-to guides and restoration project logs, visit our blog: www.spannerrash.com/
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Excellent innovation, mine weren’t quite a bad as those, but still bringing back a lot of memories from pre 2000 work on my bike and inspiring me to make good on the promise to my other half, that this is the year for finally ‘finishing’ off the bike. I remember stripping that down twice, why I can’t remember, but it was not as keen. So maybe a bleeding issue. Guess which video I’ll be watching next, and many thanks for this series.
Most brake pistons don't come out so violently with grease, but compressed air can really launch them. Be very careful if you use air or grease to remove your pistons. I find with my projects, you get lulls where you can't be bothered for a while, but once you start to make progress it can be quite adictive.
Just the method I was searching for. Thanks.
That "bleeder valve" bolt replacement was just evil. Better than epoxy I guess.
Realized I was holding my breath when you finally got that metal brake line head out.
I am glad that it has helped you. The grease gun method is really useful, but messy. I must admit that is the furthest I have had a piston go with grease. Usually they set off like that if you are using compressed air, with grease it is usually far more gentle.
After watching, I did this myself. It was immensely satisfying. I had to pour boiling water over the piston mid-way, but I got the bugger out. Sadly, the piston has irreparable rust damage, but I'm rather cofident that the caliper itself is salvageable. Thanks professor.
@@CB750KAwesome, glad you got the piston out. Did it fire out like mine in the end? 😃 A new piston shouldn't be too hard to get.
Always worth draping a heavy rag over the piston when pumping it out, catches the piston and mess, can even save a black eye or two :)
Agreed! With air they come out at quite an alarming velocity, usually with the grease gun trick they come out much more slowly though. But not in this case!
Wow!!!😝
Thanks man. Would be cool if you showed us how to connect the grease gun to the caliper.
Thanks mate, to hook up a grease gun to a brake caliper you simply need to buy a grease nipple with the right thread to screw into the caliper. They can vary, I think the CB750 is M10 with a 1mm pitch (not a bog standard M10) but please confirm that because I'm not 100% sure I remember. Grease nipples are usually only a couple of quid on ebay. Hope that helps!
Trying to figure out why my front brake squeals no matter how I adjust it. I have a feeling my piston looks similar.. I put new pads on it and greased the piston a bit and it helps but iv still just got this awful squealing noise
It is a very common problem and there isn't really a single answer. I found it was mostly because the pads weren't square to the disk, caused by the arm that the caliper is mounted on. Cleaning and greasing everything on the hinge does help. I have seen that other people have found that changing the pads can stop it. But I do believe that whatever you do it is likely to return. Good luck.
Wow that was a real mess, hope it cleaned up ok..
Sure was! Caliper rebuild vid will be coming soon :)