| [ Total Views: 512 | Total Replies: 11 | Thread Id: 28279 ] |
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 warb
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| posted on September 4th, 2004 at 09:00 PM |
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stupid q .... bleeding brakes
yeah i know... simple rules to follow.. or am i doing something wrong, installed the master cylinder, re-conditioned all the slave cylinders, put all
back together, put the drums back on and proceeded to bleeeed.. well, some came out clear with no bubbles.... eventualy, but one wheel kept giving me
greif, the pressure (or lack of) on the peddle indicated air in the lines, there was, one cylinder kept giving me air (passenger front).. then as i
look at one of the slave cylinders i noticed that the thing was on its side... the front ones... the rear cylinders are horiziontal where as the
front are vertical, it is like air is trapped in the top of the slave cylinder cause the bleed valve is in the middle.. make sence?
anyway, what is the correct procidure for bleeding the brakes, are there some tests i can perform on different parts to make sure they work, am i
missing simething here?........ ok back to the :beer
btw 58 beetle..
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stevosky
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| posted on September 4th, 2004 at 09:07 PM |
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when I did the master cylinder on my beetle apparently you are supposed to fill the master cylinder with brake fluid before you put it in the car ?? I
dont know how! All I did was loosen the brake lines at the master cylinder and pumped the brake til it pushed the air out of the master cylinder and
then bled normally. It seemed to work - I'm still stopping
Steve
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stevosky
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| posted on September 4th, 2004 at 09:08 PM |
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when I did the master cylinder on my beetle apparently you are supposed to fill the master cylinder with brake fluid before you put it in the car ?? I
dont know how! All I did was loosen the brake lines at the master cylinder and pumped the brake til it pushed the air out of the master cylinder and
then bled normally. It seemed to work - I'm still stopping
Steve
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andrewh
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| posted on September 4th, 2004 at 09:26 PM |
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Is the bleed point okay? I found one of mine was quite buggered when I bled my brakes. We went through so much brake fluid doing that one that it
wasn't funny.
If someone has damanged the thread in the past then it might be sucking air through the thread.
The procedure I used is:
-take foot of brake pedal.
-open bleed valve
-depress pedal stopping when it hits the bottom
-close bleed valve (you may want to do this just before it hits the bottom in case the person depressing the pedal lets it bounce sucking air back
in)
-lift pedal
-repeat
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silver
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| posted on September 5th, 2004 at 12:58 AM |
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You have to start with the longest line first so bleed the passenger rear first then the driver rear then passenger front and then driver front
......
S
Keeping it real !
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 vw54
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| posted on September 5th, 2004 at 06:51 AM |
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You have to belled the master cylinder first fit to of the lines and leave the tird open. get someone to pump slowly and hold your finger over gole
to allow pressure to build up.
Have you got the small washer under the rubber on the inlet side of the cylinder, you need to have this fitted is has and elongated hole in center
while the pedal is held down fit the third line and tighten dont let pedal up
Go to the pass side rear and start bleeding there check the bleed nipple as they may be blocked. do drivers side rear then go to pass side front
andfinall drivers side which is closest to master cylinder.
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warb
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| posted on September 5th, 2004 at 11:06 AM |
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thanks for the replys,
dave, i do have the washer.... its bent, i assume this is correct.. which way is up..
like this ^ or like thus v ..
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warb
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| posted on September 8th, 2004 at 07:29 PM |
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anyone? :o
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warb
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gimme some butter im on a roll.....
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| posted on October 10th, 2004 at 12:18 PM |
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ok, bought and installed a new master cylinder... bled the brakes ok but there is poor pressure, i noticed when the brake pedal was pressed brake
fluid comes back out into the resivoir, whats with that? what am i doing wrong?.. suggestions? does the above metioned washer have to go in a special
way?
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Desert Moose
A.k.a.: Chris Hill
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| posted on October 10th, 2004 at 12:35 PM |
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Ummmm back yard tools.......LOL. I love making them:P
Get a 600ml coke bottle and some fishtank pump hose, make two holes in the top of the coke bottle lid one so as the hose will fit nicely the other is
a breather.. now the hose goes to the bottom of the bottle at one end and the bleed nipple at the other. what this is for is so then you bleed the
brake fluid stays in the hose/bottle and you don't suck air.:thumb
hope this helps
[Edited on 10-10-2004 by Desert Moose]
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Special Air Service
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| posted on October 10th, 2004 at 09:59 PM |
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when bleeding the rears jack the rear of the car up as high as possible to help any trapped air bubbles find their way out.I have also read somewhere
on this forum that when you replace the master cylinder you should start bleeding from the shortest line and work to the longest.Haven't tried this
though.:blah
[size=5] Calling all NSW Mid North Coast Veedubbers
Click Below [/size]
[size=6]Mid North
Coast VW [/size] |
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68AutoBug
A.k.a.: Lee Noonan
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| posted on October 11th, 2004 at 06:50 AM |
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You need to jack the rear of the car up so that the rear brake cylinders are HIGHER than the master cylinder..
I read that if it is a dual brake system... do the front first...
I have always done the longest line first...
If all else fails... My Son tells Me that one of the pop top drinks - probably water- screws onto the dual system brake reservoir... place a hose or
whatever over the pop top bit and connect to a compressor... He used a real compressor at low pressure.. I was going to use a cheap 12v tyre
compressor to do the job....
Best of luck... Once that master cylinder is empty... You have problems... I replaced all brake hoses , cylinders and master cylinder and took Me
months to get a pedal at all...
You do need two people to bleed the brakes properly IMHO..
and order 4 new brake nipples before You start... Its well worth the $4....
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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warb
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| posted on October 11th, 2004 at 08:49 AM |
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sorted, all seems to be ok, its single circuit.. I did the front first, by plugging the rear ones at the cylinder with an old brake line with one end
blocked, then I did the rear, I had to adjust the rear brakes out as there was too much movement,
however, the pedal still rides to within 2 inches of the firewall, is that normal? ..
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68AutoBug
A.k.a.: Lee Noonan
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| posted on October 11th, 2004 at 08:52 AM |
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so long as it doesn't touch the rear wall...
You could always adjust the master cylinder shaft behind the pedal....
Best of luck
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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