| 40standardcoupe | -- 04-11-2013 @ 2:02 PM |
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Changed over to Dot 5 synthetic brake fluid. Bled brakes, nice pedal and are fine until next morning. One front brake leaks just a little bit at the same area - crush washer. I've changed all parts twice now, changed crush washer every time and still same problem. Any suggestions?
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| kubes40 | -- 04-11-2013 @ 2:13 PM |
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As it leaks in the same exact spot each time there must be an imperfect surface either on the wheel cylinder and / or the brake line. That crush washer will only do "so much". Are you using the correct fit washer? This message was edited by kubes40 on 4-11-13 @ 2:13 PM
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| supereal | -- 04-11-2013 @ 2:13 PM |
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That isn't a rare problem with silicone (DOT 5) fluid. If you have a leak, it usually requires replacement of the offending fitting or hose. It happens because there is a minute flaw somewhere in the connection that doesn't seal with the crush washer. We don't do silicone conversions at our shop because of the problems with chasing leaks. DOT3 is cheap and it just makes sense to replaces it every couple of years.
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| 40standardcoupe | -- 04-11-2013 @ 6:01 PM |
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Really appreciate your help and input. Just got the '40 Ford in Dec and started working on it about a month ago. Going to change the washer one more time, if doesn't work, then just change everything back to Dot 3. I'm getting tired of "the dog chasing its tail!". Rather be out riding in the '40 Ford instead of looking at it in the garage.
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| 40 Coupe | -- 04-12-2013 @ 3:10 AM |
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If it is the bolt through the brass fitting on the LH front then add a second washer to the first and try again.
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| TomO | -- 04-12-2013 @ 7:31 AM |
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If you change back to DOT 3, you should rebuild all of your cylinders (4 wheels and master) and flush the lines with alcohol. DOT 3 and DOT 5 are not compatible with each other. You may still have the leak after changing back. Tom
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| supereal | -- 04-20-2013 @ 10:36 AM |
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The sealing of brake components depends on the condition of the mating surfaces of the cylinders and the hose or line fittings. If the threads on either, or the mating surface have almost imperceptable mars or scratches, a leak is inevitable. The only cure is replacement of the affected parts. Given that many, if not most, of these parts are now produced overseas, it is a wonder we don't hear more about it.
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