How to Rebuild an ATV Front Brake Master Cylinder | Partzilla.com
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- Опубліковано 10 лют 2025
- Learn how to rebuild a master cylinder from start to finish. Buy a new OEM master cylinder set: www.partzilla.c...
If your brakes feel a little spongy, it might be time to put some work into your front brake master cylinder. In this video, John shows you how to bleed your front brakes, how to remove the front brake master cylinder from the handlebar of your ATV, and how to take apart the master cylinder - including how to use retaining ring pliers to remove that pesky circlip. He also shows you how to rebuild the master cylinder using new OEM parts and how to reinstall the master cylinder onto your handlebar. No special tools are required for this job, just a new front brake master cylinder kit and some patience.
See a diagram of the front brake master cylinder: www.partzilla....
When you’re done, you’ll need to refill and bleed the brake system: • How to Bleed ATV Front...
Read how to do this job step by step: www.partzilla....
VIDEO HIGHLIGHTS
Draining the braking system - 0:45
Removing the front master cylinder - 2:00
Disassembling the master cylinder - 4:35
Reassembling the master cylinder - 6:15
Reinstalling the master cylinder - 7:40
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In the video we’re working with a 2007 Honda TRX400 EX, but you may have similar steps for your Honda ATV. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.
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You guys are great. Thanks for all the how to videos. My daughter and I rebuilt the brakes this weekend but we now need to do this. Because we aren’t getting any fluid to come out of master cylinder. Thanks again.
Thanks for the video, I rebuilt the master cylinder on my 2000 Honda Foreman today. Had no ideal how to do it until I watched your video.
This Vid helped me rebuild a similar Master....at least gave me hope to persist in getting that circlip out which is a major pain since the prongs from the snap ring pliers do not go deep enough...
Screws in master cylinder cover are not Phillips. They are JIS. Japanese Industrial Standard. Phillips will strip the head. A JIS screwdriver like the Vessal brand is the only proper driver to use...the shape is different. Phillips screws are designed to cam out, JIS is designed to be used over and over.
Thanks for posting 👍
Next week I will be doing , rear pads, master cyl. & rod seals on my 400ex
Good video, details and camera views were just right, thanks.
Wow what a great video. very well described procedure. Thanks!
Thanks for the video ! I just rebuilt my yamaha Kodiak master cylinder .
Doing mine tomorrow. The ole 94 just keeps going.
I got a 2002 trx250 i rebuilt master cylinder it was great but it sat for a month now brake lever not tight like its lose pressure i dont see any leaks also when i rebuilt master cylinder i put new wheel cylinders in both sides any ideas
Thanks rob
If only it was that easy, some brakes are a pain and more so are all these low quality seals that brake after 5 mins....pay $50 for rebuild kit seal breaks within minutes, look online can buy whole master cylinder for $25 (remake) ...imagine that the OEM seal only lasted 30 years.
Great video
hi John, on my 2017 Polaris 1000 Touring, I notice there are two tiny holes on the cap of the front master. If I squeeze the brake lever down and look closely at these holes, I see the smallest amount of fluid seeping out the holes. What are these holes for and im afraid of over tightening because I dont wanna strip out the screws and holes.
Superb as always. Looks so easy.
I've tried with 2 diff snap ring pliers but can't find one that will fit into the tiny holes on the c clip (Honda Recon 250). What specific brand pliers are you using?
We like these from Motion Pro: www.partzilla.com/product/aftermarket/3ILQ-MOTION-PRO-08-0186
My new master cylinder has electric output for brake light and my old does not..will it stilll b compatible..
That was very good
Hi,
I have a 2001 Honda trx 400ex, same brake module just no brake light. Quick question. My front brakes lock up after riding for awhile, i open the bleeder and let the pressure out then ill be good for a little while until i have o do it again. What could it be? Collapsed line, rebuild in need? Also, when i let the pressure out of one side the other sides pressure will come out to, so both wheels spin freely.
Thanks
+Matty b Sounds like your front master is in need of a rebuild.
While bleeding the brake, should you see bubbles coming up in the reservoir? I’m getting brake fluid shooting up a little from the reservoir and the brakes don’t work.
Check your master cylinder
I got my new master cylinder and installed it. I followed the instructions on bleed the lines but it fills like it’s not building pressure because when I release the pressure from the caliper very little fluid comes out. Do you think I need new calipers? I already have a new master cylinder and the lines are a couple of months old.
You might have an air bubble in the master.
@@PartzillaParts- how do you fix air in the master?
Do you have any idea what is causing a 1995 Honda 300 Fourtrax Front brakes not have any pressure? I pull on front brake handle it is has no pressure on it no matter how many times i pull it. Any idea? The master cylinder or air in lines? Thanks again.
Always try to flush and bleed the master cylinder and brake lines as a first step. It's most likely air in the lines.
Thanks for the reply, I am finally getting ready to mess with it and I removed the brake hose line coming from the Master cylinder & it won't even pump nothing out of the Fluid box holding fluid with the hose off that was attached to it. So it is not pumping I guess still. Maybe needs rebuild or what you think still? Sorry to bother again and thanks again for any info.
I wonder if this procedure is similar to Yamaha set up. But then Honda uses Nissin Brake master assembly’s.
What can I use to replace kymco parts?
my pump keeps getting stuck.... just baught the rebuild installed it and it does the same thing im tryin to bleed the brakes so it can get some pressure behind it but it takes forever because i cant fully apply the brake due to the pump getting stuck..... think i just need a new master cylander its self?
+Aaron Wood Sounds like the master has had it. The bore is so small that it almost impossible to hone it out. Go ahead and replace it.
+Partzilla.com thanks! your the man
How did the master cylinder replacement go, Aaron? If you haven't gotten to it yet -- here's a link to the kit on Partzilla.com: www.partzilla.com/parts/detail/honda/HP-45530-471-831.html
Part number/link for 2002 Honda Sportrax 250ex front brake Master Cylinder & Front brake pads please
Dont forget to mention. Wipe down all surfaces afterwards. Brake fluid is very very corrosive.
would this all be the same for my 2002 400 ex
It should be.
I have a question about my brake calipers I just watched all the videos on brakes and my brakes don't work at all now after replacing them. I don't think the calipers are moving at all
Did you make sure they have been bled? ua-cam.com/video/UKg-exCLNco/v-deo.html
+Partzilla.com yes I bled them twice and still nothing
My bet is the caliper is frozen. What make/model are you working on?
+Partzilla.com identical to yours but black
My front brakes are completely hard to press and when I get the gas it doesn't move it feels like if someone is holding on to the front brakes so it doesn't move because the brakes are on without me pressing it.. What could that be??
I can't remove the circlip out of the master cylinder.
My handle won’t pull in frozen what’s wrong
You lost me when you said you "have to have" impact........