1985 Honda Trx 250 4 trax No front brakes

[Arizona]

So i have had this trx 250 that i brought back from the grave. Long story

but got it running and the master cyl eye glass was broken out so it hasnt worked in years. 

I replaced it, filled and bled the cyl, bled the brakes, I dont see any air coming out when im bleeding them

but no matter what no pressure on handle. Will stop the turning wheel if spun by hand but wont hold at all. 

I adjusted the brakes also, checked for leaks at the brake cyls, all good. No leaks at lines or fittings, I have put a lot of fluid

throught them and i know the routine as i did brakes on autos for years. Have new washers on master cyl, I would hate to replace 

parts knowing their good. Funny thing, few years ago same style vehicle i bought same broken master cyl and same problem after

replaced. No pressure, Any ideas? Pretty simple system but maybe you guys have had similar problems. Thanks Az

Just so you know I have replaced the complete master cyl, not just the glass. Az

[MarkinAR]

Will the MC pump fluid out if you just crack a line?  If not, then it's probably defective out of the box.  Sometimes air pockets are nearly impossible on those little MC's so often times you have to power bleed them with a suction gun.

[davefrombc]

Rather than suction , pushing fluid back from the wheel cylinder bleeds to the master cylinder can clear  an air  lock  if that happens to be the problem. Used that a few times on old auto  systems that  didn't want to  clear trapped air through normal bleeding.

[Arizona]

I bled the m/c first, gravity fed both lines forever, Pumped up and bled 

the standard way, barely any tension on lever, it does come shooting out of the bleeder

when bleeding but still not enough to activate brakes. I even clamped off 1 line at a time. 

When doing so it increased the tension on lever a lot but still not right. I even was tapping on the brake line where

it connects to the wheel cyls, and also at the y connector, still same condition. Easiest things seem to mess with

you the most. Like i said before also had another one with a broken m/c and ended up same problem. Never did get

enough pressure to slow you down. Would not even keep you from rolling it with the brake on. Dam Hondas! Az

[MarkinAR]

Sounds like the o-rings in the MC aren't sealing completely and letting a bit of pressure escape back into the reservoir.  Had a MC on a Chevy do that a while back.

[Arizona]

well some one wanted to but it so away it went, still no front brakes, 

guess ill never know but sure ill get another with the same problem. Till then , Az