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Old 02-18-2011, 05:28 PM
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banjo fitting leak

I've got a leak problem with flexible brake lines with banjo fittings that attach to the front calipers. Even though I've installed the new copper washers on both sides of the fittings, and tightened them down, I have a very small leak on both front calipers. The calipers are rebuilt mid-80's GM (Monte Carlo), and new brake lines. This set-up is a disc brake conversaion on my 1948 Plymouth. The leak is very small, but it's there. Anyone have a similar problem? Thanks.

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Old 02-18-2011, 06:14 PM
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Quote:
Originally Posted by Oldguy48
I've got a leak problem with flexible brake lines with banjo fittings that attach to the front calipers. Even though I've installed the new copper washers on both sides of the fittings, and tightened them down, I have a very small leak on both front calipers. The calipers are rebuilt mid-80's GM (Monte Carlo), and new brake lines. This set-up is a disc brake conversaion on my 1948 Plymouth. The leak is very small, but it's there. Anyone have a similar problem? Thanks.


Are you sure you have it tight enough ?


Cole
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Old 02-18-2011, 06:19 PM
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the copper seal washers may be too thin and the bolt bottoms out before enough force is applied to the sealing washers. Try and get some thicker ones.I have had this happen before.
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Old 02-18-2011, 06:21 PM
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I didn't use a torque wrench, just a 3/8" breaker bar and a 10mm socket. But I did make them pretty tight. I was a little concerned about the banjo bolt being drilled in the center to allow fluid flow. Any idea what proper torque should be for these bolts? I know they are metric, but the threads looked very close to a regular 3/8" bolt.
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Old 02-18-2011, 06:30 PM
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On a GM metric caliper the torque spec is 32 ft. lbs. for the banjo bolt. But you might want to think about what latech said if it don't work going by the specs, I have had to go to a thicker washer before also.


Cole
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Old 02-18-2011, 06:41 PM
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Here's a link from a search on this board, others have had the same issue...

Brake leaks driving me crazy!
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