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Discussion Topic:
Leaking master cylinder
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fordv8j |
09-11-2015 @ 7:17 PM
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New Member
Posts: 176
Joined: Jan 2015
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Just replaced the master cylinder on our 38 coupe with a new NAPA one,went to Motorfest...came home put in garauge..it was dripping fluid..I use dot 5 fluid...they are going to replace it...who makes a good rebuild kit if this one leaks? I think it was made overseas...their kits probably are too....THANKS
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shogun1940 |
09-14-2015 @ 4:35 AM
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Member
Posts: 464
Joined: Feb 2010
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the rubber seals probably not made for dot 5,,
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TomO |
09-14-2015 @ 7:47 AM
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Senior
Posts: 7250
Joined: Oct 2009
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If it is dripping fluid, the master cylinder is bad. DOT 5 is compatible with all rubber brake parts or it could not be sold. That is the reason for the DOT specifications.
Tom
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fordv8j |
09-14-2015 @ 6:42 PM
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New Member
Posts: 176
Joined: Jan 2015
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Just replaced the NAPA master cyl. with another Napa one..Ihave been using dot 5 fluid for years,also in our 38 conv coupe without any problems...but maybe the rubbers are different now...time will tell..thank you all
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42oink |
09-15-2015 @ 8:30 AM
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New Member
Posts: 121
Joined: Nov 2010
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Hi, At risk of sounding silly, where is it dripping from? Sometimes I over-complicate things and then find it is a simple problem. Are all fittings tight? Or is the pressure only forcing it out a connector. Just a thought. oink
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fordv8j |
09-15-2015 @ 6:15 PM
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New Member
Posts: 176
Joined: Jan 2015
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it was leaking out the rubber boot
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fordv8j |
12-12-2015 @ 2:45 PM
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New Member
Posts: 176
Joined: Jan 2015
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The 2nd one from NAPA also leaked..they refunded my money...got one from Advanced Auto..it is also leaking..looks just like the NAPA ones...MACS has them that they say are made in the USA...anyone have any experience with them? maybe mechanicals are not that bad after all...I use dot 5 fluid
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TomO |
12-14-2015 @ 9:14 AM
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Senior
Posts: 7250
Joined: Oct 2009
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A couple of years ago, we tried several master cylinders that were made in China on a 47 Ford, They either leaked or could not be bled. We went to our local parts house and asked for one from the US. They provided us with an re-manufactured one from Wagner. We bench bled it, installed it and and it is still working fine. I like to buy parts locally if I can, because the local suppliers will usually stand behind their products and I don't have to pay shipping charges for returning the parts. The Wagner P/N is MC1050. Rock Auto, Amazon and E-Bay list some for sale, if you can't find one locally.
Tom
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len47merc |
12-14-2015 @ 9:53 AM
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Senior
Posts: 1165
Joined: Oct 2013
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Agree with TomO on the US-made reman Wagner. Bench bled and installed the same on my '47 Merc and has been working without problem for four thousand miles+/2+ years. While Dot 5 should work fine as noted above, I've been running Dot 3 since installing the new unit without problem - just because I had it and it needed to be used up.
Steve
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TomO |
12-14-2015 @ 10:15 AM
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Senior
Posts: 7250
Joined: Oct 2009
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Steve, only use fresh brake fluid in your system. Dot 3and 4 are glycol based and attract rust forming water. They should be flushed every few years to reduce the damaging rust in the wheel cylinders and lines.
Tom
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