Brake pipe leak

[mark989]

I have just fitted some overhauled rear clalipers. When i fitted the brake line fitting and primed the system it leaked through the threads. I replaced the brake fitting and it still leaks..
I checked the face of where it seals and it looks clean. It just won't seal? I tried to fit it three times and it leaked every time.

Any ideas on why it won't seal. The threads are all intact and fine.

 

[MicKPM]

Are the union/calliper threads damaged? Are the fixings properly tight? Are the lines "factory" made or "hand" made on your driveway as the flairs may be the issue if you've made them.

Mick

 

[mark989]

the flare is a renault part. Is it not the flare that seals onto the bottom face. The threads looks a little bit corroded but i thought that it was the face that was important to seal it. I tightened it past the point of resistance first then a bit tighter till very tight and it still leaked..

 

[MicKPM]

Correct, its the flare itself that creates the actual leak-proof seal and the threads merely add the load to keep them in place. Standard lines are a steel construction and tend to last forever unless there are any obvious signs of damge such as flat spots or hammer marks. More stupid questions: Are you 100% sure the calliper is correct or the vehicle and that the flare/union is the correct size/thread?

Mick

 

[mark989]

Does any body know if a copper washer is fitted on the end of the hose. Just wondered as some calipers use them

 

[MicKPM]

If its a standard cup type union then no copper washers are used. These are only used (normally) on banjo "take-off" type fittings.