| [ Total Views: 660 | Total Replies: 12 | Thread Id: 104255 ] |
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 64blackbettle
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| posted on December 1st, 2013 at 03:46 PM |
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dual circuit brake master
Can you replace the rubber grommets on a dual circuit brake master cylinder. The unit is new but i think I've stuffed the rubber fitting that feeds
the front brakes when installing the new brake hoses. The plastic hose fitting that plugs into brake hose is really loose and can easily be removed
from the rubber.
It would definitely explain why I'm not getting good pedal pressure as all brake cylinders, shoes, lines have been replaced, but when I bleed the
front brakes I get a constant flow of air bubbles through the bleeder value.
I want to avoid replacing the master cylinder if possible but if that's my only option, could someone suggest where can pick one up in melbourne.
Thanks
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cb john
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| posted on December 1st, 2013 at 04:26 PM |
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Is there a leak around the loose fitting? Disks or drums?
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hellbugged
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| posted on December 1st, 2013 at 05:57 PM |
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Vintage vee dub stock them
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vlad01
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| posted on December 2nd, 2013 at 10:30 AM |
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there is also different grommets/fitting sizes too as I have found in the past.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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cb john
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| posted on December 2nd, 2013 at 02:55 PM |
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Yes, there are two different sizes...
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64blackbettle
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| posted on December 4th, 2013 at 09:48 AM |
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the rubber grommet has a small amount of oil around the base.
I've been told that Dual Brake Masters should be used on Front Disc Brake and not recommended for Front Drums. They "might" lock up in if you're
running to much tyre pressure, or oversized wheels or if it's wet. I'm running the Porsche style chrome rims on the front which I think are 15"
with a 195 or 205 tyre.
Has anyone experienced this and should I convert back to a single brake master.
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vwo60
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| posted on December 4th, 2013 at 09:55 AM |
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Plenty of beetles that came from the factory with a dual master cylinder and drum brakes. use a dual circuit master cylinder as it will be safer and
there will be no problems.
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cb john
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| posted on December 4th, 2013 at 02:05 PM |
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The difference is in the Residual Pressure Valve.The RPV needs to be present on drum brakes on master cylinder up to '73 model...
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vwo60
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| posted on December 4th, 2013 at 04:59 PM |
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They are not available on any replacement master cylinder and plenty of drum brake cars run without them
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cb john
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| posted on December 4th, 2013 at 06:05 PM |
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After '73 Master cylinder is without RPV on the drum brakes...there are different grommets used, which is perhaps the case of ill fit in this case..
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64blackbettle
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| posted on December 5th, 2013 at 08:03 PM |
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I've done some reading online and it's recommended that you use a 10 psi residual pressure valve
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64blackbettle
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| posted on December 5th, 2013 at 08:06 PM |
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oops. hit Post rely to early. ........
Any way I've done some reading online and it's recommended that you use a 10 psi residual pressure valve for drums and a 2psi for disc brakes. I
might speak to a brake specialist tomorrow to get the definitive recommendation.
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64blackbettle
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| posted on December 8th, 2013 at 09:50 PM |
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The answer I got was. I've never heard that before.
Installed the new dual BMC (Brake Master Cylinder) and same deal. I'm having issues with bleeding the front brakes. When I open the front drivers
side brake line at the BMC and pump the brake pedal, it basically spits out bubbles like a water pistol that just run out if water.
I have bled the brakes from the Rear LHS to the front RHS. The rears bled through OK but the fronts are no go. Going to replace front cylinders and
do it again.
Also tried the two types of brake reservoir. The front mounted with blue hose and the reservoir that mounts directly to the top of the BMC which is
how it's set up ATM.
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