mad-butcher
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| posted on 30/4/04 at 07:25 PM |
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bleedin brakes
in more senses than one bled the fronts no prob's but no joy with the rears. t peice is on top of dif plate well the 2 by 1 cross member . just
can't seem to get the air lock over the highest point release the pedal and the fluid just runs back ...any ideas....
tony
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Peteff
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| posted on 30/4/04 at 07:37 PM |
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Undo the flexy at the rear and put it in a jar of fluid. Get someone to pump it for you till the bubbles stop. Take it out of the jar with your thumb
over the end and reconnect it quick. Theory is it will suck fluid back in as pedal returns.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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JoelP
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| posted on 30/4/04 at 08:32 PM |
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i had never done brakes before yesterday, i bought an eazybleed kit which uses tyre pressure to push fluid thru, so you dont have to pump the pedal.
just run round opening the nipples until the flow out has no bubbles in it! absolutely pisss easy, i got hard pedal feel first time!
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britishtrident
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| posted on 30/4/04 at 09:22 PM |
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quote:
Originally posted by mad-butcher
in more senses than one bled the fronts no prob's but no joy with the rears. t peice is on top of dif plate well the 2 by 1 cross member . just
can't seem to get the air lock over the highest point release the pedal and the fluid just runs back ...any ideas....
tony
Nothing to do with not getting the airlock over the highest point --- the actual ammount of fluid in the pipe work is tiny compared to ammount of
fluid displaced by a stroke of the mastercylinder.. So either something is wrong with your bleeding technique or the master cylnder or pipe unions.
Bleeding technique ---
(1) Don't release the pedal --- bring back quite slowly --- if you have Teeves (ATE) master cylinder bring back very very slowly as they are
prone to drawing air past the mastercyilnder seals-- Teeves systems are best pressure bled with a posative pressure in the master cylinder
resevoir.
(2) On last stroke hold the pedal down until the nipple is nipped up only then bring the pedal back slowly.
It is important the bleeding jar is held high and the bleed tube a good fit, also only unscrew the nipple just enough to give fluid flow.
It worst comes the worst and above fails try clamping the (rubber) flex hose just enough to put a restiction on the flow and bleed it again.
--- the clamp acts like a one way valve.
Master cylinder --- In addition to a duff seal corrosion or damaged bore/crud at the end of the cylinder can cause the seal to allow air to be
drawn in as the pedal returns.
Also make sure that the piston comes back far enough to uncover the recuperating port.. With balance bar system the pushrod may need pulled back
manually.
I know is obvious but even a tiny pipe work leak will cause a spongey pedal.
[Edited on 30/4/04 by britishtrident]
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DEAN C.
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| posted on 30/4/04 at 09:43 PM |
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Any difficult brake bleeding problems just use an eazybleed!
Clutches can sometimes be the worst and I have never known the eazybleed not to shift any awkward air bubbles.
Remember if you mess about too much(especially with secondhand cylinders) you will more than likely knacker up the master cylinder seals.
Most mechanics I know have got one of these stashed somewhere for the awkward jobs.
Once I've finished a project why do I start another?
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Hellfire
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 posted on 30/4/04 at 10:37 PM |
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We had a similar problem - the airlock was in the master cylinder. Disconnect the rear pipe from the cylinder and check it's getting this far
first!
We disconnected then pressed the pedal - loads of bubbles came up into the res. as the cylinder filled up...
HTH
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britishtrident
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| posted on 1/5/04 at 06:31 AM |
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Re Eazy-bleed
A good way of bleeding (in fact just about the only DIY way of bleeding Teeves systems) BUT when using this or other presure bleeding equipment it
is important to also pump the pedal at least a couple of strokes otherwise air can get trapped in the mastercylinder.
Bleeding tools that either pump the fluid the wrong way through the system from a nipple or use a vacum to suck it out a via nipple should be
avoided.
One of the reasons I am very much against braided hoses was trouble I had bleeding a new system with them --- After a couple of hours I discovered
the one end fittings hadn't been fully drilled through -- the resulting in a blind hole and no fluid getting through to one of the rear brakes.
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bob
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| posted on 1/5/04 at 08:43 AM |
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If you have rear disc/caliper set up this problem is common,calipers on sierra/granada are usually at 12 o-clock so indy set up leaves(nipple)highest
point in wrong place meaning airlock.
I bled my rears off the hub but have since bought the eezibleed kit for pressure bleeding.
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