Help Series 3 brake bleeding problems

manicmodeller · Dec 19, 2012

Hi everyone
I have a 1976 series 3 lwb and have been bleeding brakes for weeks now and still have an air lock. I finally took it to a garage to bleed the brakes, they phone me up and said the reason the brake bleeding isnt working is that the pipes are connected wrongly, they should feed in from the bottom and bleed at the top. is it possible that at some point some idiot has replaced the hose and the slave cylinders and put the cylinders back in the wrong positions or does anyone know what might have be going on?

oxides · Dec 19, 2012

Sounds like you've had an idiot in. You'll never get all the air out unless the cylinders feed from the bottom and exit from the top.

ajb403 · Dec 19, 2012

No, that's how the twin leading shoe brakes come. Flexi hose into the top wheel cylinder, metal pipe down and round the front of the axle tube and into the bottom wheel cylinder with the bleed nipple.

Mine bled fine with an eezibleed when I drained the system and replaced all the flexi hoses, wheel cylinders and half the metal piping.

Did you wind the snail cams all the way in first to minimise the volume in the wheel cylinders before you bled the brakes?

Locky1978 · Dec 19, 2012

Sounds like you have the dual cylinder larger brakes on the front. This is how they came out of the factory with the bleed at the bottom. I converted mine to bleed from the top. You can bleed them by vacuum or take the backplates off and tip them up to bleed them. It's hard to bleed that setup with the pedal alone.

oxides · Dec 19, 2012

Misunderstood the problem - yes, it feeds the top cylinder first but at the bottom of it. feed to second cylinder from top of upper cylinder to bottom of lower cylinder, bleed nipple on top of lower cylinder. As ajb says, turn the adjusters (with bleed nipple open) to minimise the cylinder volume before bleeding.

johnny curt 1 · Dec 19, 2012

right heres my two pennanth worth

get yerself a good quality pump action oil can

one of these will be perfic

step 1 cut the fekkin brass twot off the end of the pipe and remove the coathanger stiff wire out the middle of the hose and fill it with fresh brake fluid

step 2 drain the servo reservoire on the master cylinder

step 3 slacken the bleed nipple off the brake cylinder and connect the hose thingy

step 4 pump away till yer dont see any bubbles coming up out of the reservoire only fluid

do this in order back passenger first back drivers second front passenger third and the front drivers last

if yer dont get a good pedal after this adjust yer snail cams on the brake drum backplates

Bump · Dec 20, 2012

johnny curt 1 said:
step 1 cut the fekkin brass twot off the end of the pipe and remove the coathanger stiff wire out the middle of the hose and fill it with fresh brake fluid

step 2 drain the servo reservoire on the master cylinder

step 3 slacken the bleed nipple off the brake cylinder and connect the hose thingy

step 4 pump away till yer dont see any bubbles coming up out of the reservoire only fluid

do this in order back passenger first back drivers second front passenger third and the front drivers last

if yer dont get a good pedal after this adjust yer snail cams on the brake drum backplates

huh... that doesn't seem a completly stupid idea actually.

Help Series 3 brake bleeding problems

manicmodeller

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oxides

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ajb403

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Locky1978

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oxides

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johnny curt 1

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Bump

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