I'm posting this PM I received so others may learn from the post.
Originally Posted by CStanley
You commented on one of my posts saying "We replace ford B700 lines with hydraulic lines as a standard in the shop"...
I have a question for you (since you seem to be very knowledgeable).
I noticed that basically from the fuel tank to the rear of the parking break line was completely replaced with copper pipe (like for plumbing),,, is that safe???
If it is safe, should I just replace the last 6 feet with copper pipe or should I go with hydraulic lines for the last 6 feet???
I work part time for a bus shop that maintains 400 buses.
If it is copper, make sure to replace it. If it's a stainless steel hardline with properly flared ends at the fittings, leave it.
There is nothing wrong with stainless or even steel hardline. In reality, hardline is better than the flex line.
Just like you see on equipment like bobcats, ect. The hydraulic lines are hardlines, only using flexible where needed. This is due to the flex lines being able to swell from the pressure changes. In a brake line, this equals a spongy brake peddle.
Copper can not take the vibration, and therefore should never be used in a brake system.