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Tii front calipe upper bleeder wont bleed

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installed a new master cylinder on the tii and bled the brakes with a power bleeder

all the brakes bled fine except for the passenger front caliper. the inner and lower bleeder screw will bleed fluid out but the upper bleeder has nothing coming out when I open the bleeder.

if I move the piston by pushing on the pads with a big screw driver I can get a little fluid out but its old and dirty not the new stuff

any ideas as to what could cause this?

thanks in advance

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when was the last time you rebuilt the calipers? what do the outer seals look like? how often has the fluid been changed over the life of the car?

if the answer to these questions is "i don't know", then it is time for a rebuild.

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I'd be looking at rubber hose that feeds top piston under fender. They swell shut over time. Pull that one and see if you can blow through. If not, best to replace all six (two at back).

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Try removing the bleed screw completely and checking to see if it has debris clogging up the tiny hole on the tapered end of it. Also take a dental pick and *gently* dig out any accumulated goop from the hole in the caliper. DON'T break off the end of the pick in there! be GENTLE!

Brake fluid turns gelatinous when it's nasty and old. then it clogs stuff up.

Marshall is spot on though... if the calipers are roached and crusty, it's always best to err on the side of caution!

Attached is a photo of the inner RUBBER of the supply hose, after it disintegrated and made it's way through a passageway behind a caliper piston. I've only seen this once, but it was a reality check!

Fresh rebuilt tii calipers (often with fresh pads and clips!) can be purchased for under $80 each.

post-17590-13667668292773_thumb.jpg

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I'd be looking at rubber hose that feeds top piston under fender. They swell shut over time. Pull that one and see if you can blow through. If not, best to replace all six (two at back).

if the hose was swelled shut, the inner and outer bleed screws wouldn't work either. they do.

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If memory serves, the two hoses feed the top and bottom pairs of pistons independently. So my idea is that lack of fluid at upper nipple indicates lack of fluid coming thru that part of the system.

I think you said you were using pressure bleeder - if so, try instead having someone push pedal to get more pressure. That should blow most anything out of calliper if that is the issue. But if that is the case, you have a bigger problem and safety issue.

I assume you checked bleed nipple hole. You could also pull metal pipe at calliper, put it in a bottle, and have someone press pedal to see if fluid squirts out. I suppose the hole in the calliper could have rusted shut, but I'd expect more widespread braking issues if things had got to that state.

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If memory serves, the two hoses feed the top and bottom pairs of pistons independently. So my idea is that lack of fluid at upper nipple indicates lack of fluid coming thru that part of the system.

an excellent point!! have not taken caliper apart to see which hose serves which pistons.

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well I ordered a rebuilt caliper ill have it Wednesday

I didn't pull the rubber hoses off but I loosened them and they have fluid coming out

in one last attempt tonight I took a vacuum pump home from work

vacuum by itself produced no fluid

then I attached the pressure bleeder and the vacuum pump and still no fluid

yes I have already tried poking bubbles and clearing debris with a very small piece of wire with the bleed screw out

tried it the old fashioned way by pumping the pedal

-after install of new caliper I will post my findings thanks

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recommend you change the order to BOTH calipers and new hoses. if one is done, the other is soon behind it. and if the hoses look old, they are old and should be replaced. you will have the caliper off anyway...that is the time to replace the hoses. ez.

this is the brakes. major safety item. do it all, don't scrimp.

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A small (1/16) drill bit worked for me when a piece of wire didn't to unclog my clutch bleeder. (A useful tip from CD on this site.)

Maybe that will work.

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Turned out that the rubber flex hose was collapsed internally

i checked the line where it goes through the inner fender when i posted this but did not check the other end of the rubber hose

Got it fixed thanks for the help

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I'd be looking at rubber hose that feeds top piston under fender. They swell shut over time. Pull that one and see if you can blow through. If not, best to replace all six (two at back).

the winner.

i trust you replaced ALL the hoses because of this? (including the ones at the rear subframe). if one is that old, they ALL need to be replaced immediately.

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Been there, done that.

You should, as recommended, replace them all. There are cheaper alternatives than OEM, including braided steel. That hose is a pretty common application.

You may already know this, but be sure to use proper pipe wrenches and penetrating oil on the connections. The male fitting on the metal pipes tend to rust to the pipe, so you risk twisting the metal pipe - not good. You want to undo rubber hose while holding metal pipe fitting steady. If you're replacing rubber hose anyway, just cut it so it turns.

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