Brake bleeding (SOLVED)

[Baldrick]

Having a nightmare bleeding front brake.
All fluid cleaned out.
New fluid in.
Tried pumping and relesing air from bleed screw at the same time then closing before releasing brake lever.
Tried reverse bleeding with home made pump, no joy.
Does anyone have any other methods to help.
Cheers in advance

[Flyingdog]

Always found something like this works every time: https://www.autozone.com/test-scan-and- ... /46839_0_0
The uniqueness of the bike's braking system..ie: being vertical from caliper to reservoir, bleeding air bubbles fairly easy by just leaving the reservoir cap off and working the lever will force the air to the top (without opening bleeder). Letting the lever snap back after a pull, works too. Kinda like tapping the brake hose. You're putting a shock thru the system. Causing the bubbles to rise. Just don't pull the lever too hard, you get a good stream of fluid shoot'n up and out. Bottom line..you don't have to open the bleeder valve, unless you're using the self (reverse) bleed system.

[Baldrick]

Thanks
I will try your system out, cheers

[Flyingdog]

Yea..sometimes it feels like it takes forever. But will eventually get bubble free..so to speak.

[soccerfan]

I was having the same problem about three years ago. Someone posted on a thread
I started and suggested starting the bike and let the vibration help work the bubbles
up. I tried it and had success. So Start the beast, let the vibration and the natural
inclination of the bubbles to rise help you along. Good luck !

[nanno]

Get a vacuum pump to suck on the bleeder nipple. As you're in CZ, you can get these as P*nis-pumps in adult shops.

The other thing I like to do is to bleed them until they actually move the brake piston and then take it off and use a c-clamp to push the piston back in, this usually takes most of the air up into the reservoir.

For the last bit, pump up the brake and then fix the lever to the bars with a zip-tie. After a few hours, cut through the zip-tie and then just feather the lever 2-3 times. Usually that sorts it out.

And if there's a leak, that's a good way to find it as well...

[Baldrick]

Sounds great idea soccerfan but she isnt operational at the moment.
Working on that one slowly away
Greg, also good idea as the pump can be used for other things later
Regards, tried pumping for ages, will go back to maybe the getting a brake bleeder

[Flyingdog]

Have any luck? Some of those air bubbles can really be pita. They can get lodged in the damn-est places.

[Baldrick]

Hi guys,

Sorry for late reply flyingdog, but no joy with any method here.
I am thinking that maybe i have a broken reservoir pump, it doesnt seem to get fluid down correctly, hence not allowing me to move fluid correctly from reservoir to bleed nipple.

Any other suggestions would be great, maybe take off caliper and test for movement on the piston side of things.

Thanks for your help guys

[Flyingdog]

I am thinking that maybe i have a broken reservoir pump

Makes sense. Only you'd know being infront of the bike. Personally...I'd just fix it and forget it. Specially fix'n/rebuilding "anything" suspicious, when it comes to brakes.
https://www.partsnmore.com/parts/yamaha/xv750/?filters[category]=chassis

[Baldrick]

Thanks flyingdog
Nice link for parts, most likely pop them a mail to see if they post to Czech Republic where I live.
Regards and thanks

[Flyingdog]

Would be good deal if they do and be nice if S&H isn't outlandish. Being those kits are bout 1/2 the price as other sites.

[Baldrick]

Ok guys
We got a new development on the nightmare brake front.
Had suspicions the piston wasnt pumping, that stripped and checked is working fine.
Next took off caliper to check for seizure, managed to convince it to move outwards, all be it very steadily. Could not convince it to leave its comfortable home however but at least worked out that it moves.
Now cannot convince it to go back.
Anybody got any tricks on getting it to return.
Thanks in advance Baldrick

[nanno]

Balders, do you have a single or twin brake caliper setup - I guess I should have a good brake pump in my stock (somewhere, you know how this goes with me...)

Also do you have a braided brakeline or rubberhose?

Cheers,
Greg

[Baldrick]

Hi Greg friend

Single caliper just now
As spoke, look one day to change forks to twin but budget just now dont allow that mod.
Thanks for the offer also maybe looking more for a caliper as i cant get this one back in.
On a rubber hose also just now, 1 mtr ish give or take. Defo would prefer braided, in budget that one.

Cheers mate, regards

[Baldrick]

UPDATE

Brake piston is back in after some big bar persuasion, gggrrr ))
Now going to try again to bleed the stubborn thing.

Fingers crossed

[Flyingdog]

Baldrick:

Yrs ago I came across some info that some xs650s (78-early 80s I think) had forks with dual discs that would fit the earlier xv750. Never got around to checking this one out. Was going to convert the wifes bike to dual brakes. But the idea faded away.

[Baldrick]

Cheers flyingdog, will for sure be looking at this change in the near future.
Nanno mentioned something about two different types of forks fitting the early xv750.
Hopefully be meeting with him in the very near future will be discussing other opportunities also.
Cheers for that one, maybe get brake bled up now i got piston free finall, concentrate then on getting electrics done and starting finally, just building a rear sub-frame at the minute though.
Regards

[nanno]

I've gone through my stash and I have a complete TR1 frontend (37mm) and a complete twin-brake-setup with braided brakelines for you. With the parts pile growing at this rate, you either bring a trailer or a proper lorry, when you come round depending on the date.

[Baldrick]

Greg
That sounds like a winner nice one
And the parts list grows haha
40 ft trailer coming with me )))
Cheers we will need to talk $$$ soon as my sweet wife will need to be kept out of the loop at this rat
Cheers my friend