| [ Total Views: 819 | Total Replies: 16 | Thread Id: 89109 ] |
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 beachbuggy61
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| posted on March 6th, 2011 at 08:28 PM |
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Disc brake rear and poor brake pedal
Hi all,
After a bit of advice...
I've fitted a bolt on disc brake conversion to my baja and can't seem to get the brake pedal to come up even after extensive bleeding.
A mate said that I might have to get a different master cylinder when changing from drum to disc.
Thoughts and advice please...!
Thanks, Marc.
Baja
1915cc's of raw power 
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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 matberry
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| posted on March 6th, 2011 at 09:19 PM |
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A bit more info wouldn't hurt, like what model car or master cylinder presently fitted and what disc kit did you fit. May want to check with the
supplier of the kit.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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beachbuggy61
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| posted on March 6th, 2011 at 10:05 PM |
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Sorry Matt, yes I should've given more...
68 baja ball joint/disc brake front end
drum rear on swing axles
Empi kit from Classic VW
Current master cylinder is the one with two supply lines going into it with seperate tubes off to front and rear brakes
Hope this helps....
Thanks,Marc.
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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matberry
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| posted on March 6th, 2011 at 10:22 PM |
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IMO all should work ok, I have had cars come in with that exact setup with no problems as far as I can recall. Doesn't help you except that there
must be some other problem.There are recommendations that for disc's a higher pressure residual pressure valve is required but I havent used them
yet, I have some coming from the states for a job so may help with supply if you need them. Does the master cyl push rod have the necessary play
(about 1 mm) before it contacts the piston? If not it may not get the fluid replenished at zero stroke. Are the disc rotors and wheels fitted properly
yet?
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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ahoogah
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| posted on March 7th, 2011 at 06:39 AM |
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http://www.wilwood.com/MasterCylinders/MasterCylinderValves.aspx
Residual Pressure Valve
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beachbuggy61
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| posted on March 7th, 2011 at 09:12 AM |
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Thanks Matt, I'll check the master cylinder push rod, that would definitely account for the issue if it's not right!
The wheels and calipers are all in place properly, yes.
I can see the benefit of a residual pressure valve for race use, but for the street, wouldn't it be like having your foot very lightly on the pedal
all the time? i.e. wearing out brake pads more quickly?
Willing to give anything a try though to get it right. I'll check the push rod and bleed them a few more times and let you know if I'm up to trying
the valve!
Cheers, Marc.
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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1303Steve
A.k.a.: Steve Carter
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| posted on March 7th, 2011 at 09:37 AM |
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Hi
Is there a left and right calliper? As in the bleed nipples being at the top.
Steve
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beachbuggy61
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| posted on March 7th, 2011 at 09:55 AM |
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Hi Steve,
Yes there is a left and right and they're on the right way with bleed nipples at the top.
Marc
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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Camo
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| posted on March 7th, 2011 at 10:25 AM |
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Are you bleeding the furthest caliper from the master cylinder first and then working back to the closest one last.
This is the way I was taught 25 years ago, not sure if it makes a difference.
Kev
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beachbuggy61
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| posted on March 7th, 2011 at 10:44 AM |
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Kev,
That's the way I was tought to do it too. Yes, started with the left rear and worked my way closer. Aparently I just haven't done it enough times
yet!!
Bleed and bleed...... 
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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Aussie Dubbin
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| posted on March 7th, 2011 at 11:27 AM |
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What condition are your rubber lines in? Have you moved them or are they cracked at all/ cruddy inside? a small leak perhaps where you have mated the
new calipers...
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ian.mezz
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| posted on March 7th, 2011 at 11:46 AM |
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sounds like it could be a dud master cylinder.
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beachbuggy61
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| posted on March 7th, 2011 at 12:50 PM |
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Not sure about the rubber lines, I might replace those before I do any more bleeding.
I'm hoping it's not the MC Ian, I only put a new one in about 12 months ago and it was working fine with the drums before the conversion....
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
|
|
1303Steve
A.k.a.: Steve Carter
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| posted on March 7th, 2011 at 12:53 PM |
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Hi
I fitted a new master cylinder to a bug a few months ago, front bled very easily, the rear wouldn't get a pedal at all and no fluid came out of the
nipples no matter how much we bled the system, I then used my vacuum bleeder and got a pedal straight away.
Are you getting a good rush of fluid out of the nipple when when you open it?
Steve
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beachbuggy61
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| posted on March 7th, 2011 at 01:31 PM |
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Well I thought I was getting good flow, but reading all the responses, I'm not so sure now!
Will check it tonight when I get home from work and see how we go....
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
|
|
68AutoBug
A.k.a.: Lee Noonan
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| posted on March 7th, 2011 at 03:52 PM |
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| Quote: | Originally
posted by beachbuggy61
Hi Steve,
Yes there is a left and right and they're on the right way with bleed nipples at the top.
Marc
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well that is a start... lol
Jack up the rear of the car so the air will flow to the rear brakes and open the bleeders so that any air can escape..
[once You know that fluid is flowing]
loosen the brake switch to make sure there is no air behind it
and the rear brake line on the master cylinder to make sure there IS brake fluid there...
if no brake fluid is there, pour a small amount in there..
after renewing the brake cylinders etc and all hoses on My beetle
[no there wasn't anything wrong with them apart from being 40 years old]
it took 3 or 4 bottles of brake fluid to bleed the brakes...
and most people have the same problem...
best of luck...
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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1303Steve
A.k.a.: Steve Carter
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| posted on March 7th, 2011 at 05:13 PM |
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| Quote: | Originally
posted by 68AutoBug
[no there wasn't anything wrong with them apart from being 40 years old]
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Were they the wrong colour Lee?
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