How to bleed brakes with a brake bleeder. Bleeding rear master cylinder on Motorcross bike.

[Lethaltactics]

Hey Johnny, awesome videos. I have a 2008 yz250f and when I bleed the rear caliper with the bleeder gun, I am consistently getting little air bubbles and they never stop. I fill the reservoir up every time it get low and keep bleeding but tiny air bubbles never stop coming through the line. My brakes work,but I feel tho as if there is a bad seal maybe and my brakes are not 100%. If I pump the rear brake and hold down the pedal then the crack bleeder screw it just dribbles out.Is there a problem?

[Johnnysshop]

@Lethaltactics How many times did you bleed them? The rear brake is almost impossible to bleed with new lines. I did it 7-10 times before the rear brake felt dead on. If it's still won't bleed, have you checked the orings on the caliper pistons? Seals on the master? Only other thing to check is the line itself.

[DrSaxxy]

@Lethaltactics Not sure if this applies to you or not, but keep in mind that often a stream of small bubbles will be sucked into the fluid in the bleeder tube from between the tube itself and the bleeder nipple, or sometimes even be sucked through the threads of the loosened bleeder nipple, then up and out the bleeder tube.. these aren't coming from the brake line and aren't a problem really.

[Lethaltactics]

@DrSaxxy Yeah I was thinking about that. I just feel like sometimes my brakes are weak. I mean when I put it on a stand, spin the wheel and push the brake pedal down, it stop the tire and the pedal is really firm, but when I'm riding I just feel like the rear brake doesn't stop the bike like it should. Also I had to use a bleeder gun too bleed them. Is that normal? Doing the pump pump pump, hold, and crack the bleeder would not work, no pressure would build up.

[DrSaxxy]

@Lethaltactics Hmm maybe you do have either master cylinder or air in the system problems, because you should be able to lock and skid the rear tire at low speeds fairly easily if you're hard on the rear brakes.. if you can't do that there probably is something going on. Good luck, I hope you can track down the problem and fix it!

[sholmes52]

It is definitely made for commercial use but worked great for a novice like me in my home garage. I definitely would purchase it again. It is actually a Mityvac packaged using the OEM brand name and part number 25136.

[sholmes52]

Thanks for the demo. Very helpful.

[Johnnysshop]

@sholmes52 Thanks!

[sholmes52]

@Johnnysshop: I purchased one of the $34 units at Auto Zone. No way I could have bleed the breaks properly without someone helping if I had not had the tool. The instructions and various comments on you video were very helpful.

[Johnnysshop]

@sholmes52 Glad I could be a little help to ya. The AutoZone unit decent?

[Johnnysshop]

@robertokbs Thanks for watching!

[tuxedo94]

aren't you suppose to pump fluid through the system and out the cylinder forcing air up

[Johnnysshop]

@tuxedo94 Not on this one.. The more expensive models work that way and are much easier..

[emoskater1212]

@Johnnysshop does it matter if u use 2 differant brands of brake fluid

[emoskater1212]

@Johnnysshop how do u adjust the front brakes play

[Johnnysshop]

@emoskater1212 Same way basically.

[YZach]

I saw a lot of bubbles coming through the line when you were pumping it, I thought you are supposed to keep draining the system until you don't see bubbles coming through the line?

[Johnnysshop]

@YZach Correct. I wasn't completely done in the vid, just showing those who don't know how to actually do it. Some of these rear brakes can take a long time to fully bleed. PITA...

[YZach]

@Johnnysshop Ok great i was just making sure because I am going to do my rear system this weekend, thanks for the vid!

[Johnnysshop]

@YZach Thanks for watching!

[Smokeslider]

Those bubbles are coming from a leak between the bleeder nipple and the hose. It's pretty hard to find a hose that doesn't do this. It's fine.

[YZach]

@Smokeslider I just did the job and put some teflon tape on the bleeder valve, no air bubbles caused by air leakage.

[plexsus]

Thank you for showing us how to use this device.I just purchase one of this here in Canada and i almost used it the wrong way. Thx you ones again.

[Johnnysshop]

@plexsus Thanks for watching! Yeah, the instructions are a bit lacking...

[foxdmulder]

Tip: place some grease or similar around brake nipple before attaching hose to give a better seal.

[Johnnysshop]

@foxdmulder Good idea!

[mylovelyman2]

Cheers for video Johnny. ONe of the only decent ones on vacumm pumps. I read in the instruction kit that you need to stop pumping when the fluid comes through without any air bubbles. On your video this does not seemt to be a consideration. They also suggest pumping whilst opening valve. Although your method makes more sense to me. Any comments on this? Much appreciated.

[Johnnysshop]

@mylovelyman2 Thanks! Well the bleeder actually builds pressure and to pump while opening the valve is really not needed. Otherwise you really wouldn't need the PSI gauge, you would just pump your brains out.. You should wait until there are no bubbles in the system, I may have failed to mention that.

[tybill1]

man your good at explaining stuff, mines real messed up i think i need new seals, but i duno if i wana get them because im over 8 seconds a lap faster with out front breaks ahahahaha

[Johnnysshop]

@tybill1 Thanks! LOL not sure if I'd fix them then!

[pimentel63]

good video

[Johnnysshop]

@pimentel63 Thanks!

[surfsup1552]

nice bike mannn.......  :~)

[Johnnysshop]

@surfsup1552 Thanks!

[Johnnysshop]

@dmaheryfz450 Thanks!

[skidoorev600ho]

how much more stuff do you need to do now?

[Johnnysshop]

@skidoorev600ho Just gotta make time to upload all the vids. She just may be done.... Have to watch.

[skidoorev600ho]

@Johnnysshop lol hope ur having fun on it

[TomBetteridge13]

could you please do the review on the brake bleeder im really intrested in buyin 1.

[Johnnysshop]

@TomBetteridge13 Will do! May take a week or so. I've got a lot of vids to upload.

[shabow1987]

johnny ive been waiting for this video, thanks very much ;-)

only problem is i havnt got the brake blleder tool you have! is there any way wou can do it without this tool??

if not could you tell me the correct name of the tool needed so i can purchase one!

cheers buddy, daz

[Johnnysshop]

@shabow1987 The only way I've found to do them without a bleeder is with a syringe like I mentioned in the video but it still takes forever with that method. You basically fill up the master cylinder forcing the fluid through the bleeder valve with the syringe. The problem is, it's almost impossible to get the air trapped out from the bend in the line. I'll post a video soon.

[shabow1987]

@Johnnysshop cheers johnny, thanks mate