View Full Version : Rear Caliper / Break Hose Leaks
07-30-2011, 07:41 PM
I purchased a 4 wheel disc brake package back in 2007 and installed the rear calipers in 2009. Both sides leaked where the hose attaches to the calipers. I tried reversing the hoses thinking that I had the bevels facing the wrong way (see pictures) and tried all new washers and they still leaked. I have since began a body off restoration and am at the point of installing the cailpers.
Did CPP have problems with leaking calipers and hoses back in 2007? Can you look at the pictures and tell me if the bevel on the brake hose goes towards the caliper or away from the caliper? I am at a loss as to why they leak. If I cant get this resolved can you tell me what type of car these calipers and hoses fit? I am almost to the point of throwing this stuff away and buying new.
07-30-2011, 07:52 PM
I would think the hose goes the way you have it, otherwise the offset would hit the caliper.
Do the washers fit the bolt snuggly? I have had washers that were too big for the bolt and as you tighten the bolt, the groves in the caliper, scores the washer off center and causes it to leak.
07-30-2011, 07:52 PM
Looks right to me. And it looks like you have both copper washers - and you do need one on each side.
The next suggestion would be to screw the banjo bolt in the caliper without the hose installed. See if it screws into the caliper far enough. It's a long shot, but the banjo bolt may be bottoming out just as the washer touch.
If so you'll need to slightly shorten the bolt or try another. If you just add a washer (which might be tempting), the cross drilled hole may not line up.
07-30-2011, 08:15 PM
I checked to make sure the banjo bolt was not too long. It is okay. I also took some pictures of th ewashers and the length of the bolt. Looking at the pictures I would not believe both sides leak but they do. They will drip when bleading the brakes and a very slow dip when it sits w/o pressure.
The washers seem to fit correctly too.
07-30-2011, 08:28 PM
It's hard to tell for sure, but it looks like the washer fits the bolt, but it also looks like the scores in the washers are not in a complete circle, indicating a oversize washer. The score marks are crossing each other allowing fluid to follow the score marks.
I have experienced two different problems that cause leaks as you have. 1) copper washers are not annealed(some what common) correctly and replacements fixed problem, I have had to change washers more then once to get a seal. 2) The surface where the washer sits was uneven, so no matter how tight the banjos you can not get a seal as the uneven surface leaves a gap. This I've had on a few set of those cheap chinese calipers that they buy. You'll have to inspect the grooved area closely to see any uneveness.
Other possibilities: burr on the circler rings of the caliper or hose preventing a seal
07-30-2011, 09:12 PM
There's a burr or something that's causing those copper washers to look so bad. They look pretty bad.
07-31-2011, 04:20 AM
I think Nunu and Rick have nailed it. Try using double copper washers and maybe even aneal them as well. I have had to do that in the past to compensate for damaged or inaccurately machined surfaces.
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