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Brake Bleeding Problem!?

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stob62

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I've finsihed rebuilding my front & rear TR6 brakes (new cylinders on rear drums from TRF).

For some reason I can't bleed the rears--I keep getting air. I moved to fronts & they bled fine. I guess air is being pulled in somewhere?

Any ideas--this is driving me crazy!
 
If you rebuilt the master cylinder or otherwise removed and drained it, did you bench bleed it before reinstalling? If you don't do that it can be very hard to get air out of it sometimes. Other than that, just check all the connections at the long run union (mid car on the drivers side frame rail) and the tee at the rear. Also, did you replace the soft lines in the rear? If not, you could have one with a pinhole in it, but I'd think you'd see leaking fluid if that were the case. Also make sure one of your hard line connections going into the rear wheel cylinders hasn't cross threaded or gotten otherwise buggered up. If its not threaded correctly it could cause the lines flare end to not seat completely and create a seal. Last thing, what type of fluid are you using? If silicone then it can sometimes take a looooooong time to get all the air out, especially with the longer run to the rear of the car.
 
i recently bled the hydraulics on my tr7 fhc and was unable to get a satisfactory bleed with my mityvac. I ended up using one of those "one man bleeding kits" from harbor freight to bleed the rear brakes and the clutch.
 
stob62, if all else fails try to loosen the rear brake pipe at the master and make sure you are getting fluid out under pressure. Wayne
 
Try bleeding it one section at a time all the way to the back. It will take a little help from your friends, but you might be able to trace down an air leak eaiser. $0.02 /ubbthreads/images/graemlins/grin.gif
 
I've never had good results without having another person help. They push the clutch it and out, then hold it in (fully down) while I re-tighten the bleed screw, and work from farthest to nearest to the clutch cylinder. Sometimes I even have a third person to help keep the reservoir full. Finally, make sure your bleeder hose is clean and tight to the nipple on the bleed screw. That should do it.
 
Thanks everyone.

I finally found out what the problem was. The front reservoir (for rear brakes) of the master had some crap in it that was allowing air to mix with the fluid. As you can barely see into that front section (more great British engineering) it wasn't obvious.

Now for my next problem.....I'm posting now.
 
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