Hola everybody!
Has anyone on here used stainless braided PTFE hose to replace all of their brake hard lines? I am about to do a disc brake conversion on my '72 FJ40 and the PO replaced all of the hard lines but it was poorly routed/secured and doesn't match the OE arrangement. One way or another, I need to replace all of my hard lines but I am considering switching everything to 3an braided stainless PTFE for a number of reasons including...
-Easier to route
-AN fittings seal better and are structurally stronger that 45 deg inverted fittings
-Brake line flare fittings are technically one time use, and should be cut and reflared every time they are removed...AN fittings allow for repeated easy removal and reattachment in case of maintenance/upgrade needs
-My current drum setup has 17 hard lines/hoses...a PTFE setup would cut that down to 6, meaning less joints to leak and lower fluid volume due to more efficient routing (also reduces sponginess).
-High quality ptfe brake hose (aeroquip, goodridge, xrp, etc) has a volumetric expansion coefficient that is near zero (hard steel lines do not have zero volumetric expansion by the way), 1/1000th that of rubber, meaning I would have to use about 4000ft of it to negate the improvement from eliminating my rubber lines. With high quality PTFE, the idea that it will give you a "spongy" pedal is a mathematically quantifiable myth.
-Reusable fittings like those made by aeroquip are simple to install and allow lines to be easily replaced on the trail or rerouted without having to buy new fittings (the expensive part)
-My fuzzy math says it would be cheaper than buying an off the shelf hard line kit, especially if you need any of the tee fittings (I do)
-I would think they would actually be more durable than hard steel line. A swivel at every fitting and flexibility across the entire line would reduce vibration induced leaks, and the line wouldn't permanently crimp like hard line if it comes in contact with a rock/etc.
-It would look cool.

I know it is common in the rally and F1 worlds to use whole car ptfe hoses for brakes. It is primarily done for maintenance reasons, but it can't be much/any drop in performance if they are willing to use it in those conditions. I'm curious to hear if anyone on here has any real world experience with making the switch on a 40. Thanks in advance for the info!
-Josh
Has anyone on here used stainless braided PTFE hose to replace all of their brake hard lines? I am about to do a disc brake conversion on my '72 FJ40 and the PO replaced all of the hard lines but it was poorly routed/secured and doesn't match the OE arrangement. One way or another, I need to replace all of my hard lines but I am considering switching everything to 3an braided stainless PTFE for a number of reasons including...
-Easier to route
-AN fittings seal better and are structurally stronger that 45 deg inverted fittings
-Brake line flare fittings are technically one time use, and should be cut and reflared every time they are removed...AN fittings allow for repeated easy removal and reattachment in case of maintenance/upgrade needs
-My current drum setup has 17 hard lines/hoses...a PTFE setup would cut that down to 6, meaning less joints to leak and lower fluid volume due to more efficient routing (also reduces sponginess).
-High quality ptfe brake hose (aeroquip, goodridge, xrp, etc) has a volumetric expansion coefficient that is near zero (hard steel lines do not have zero volumetric expansion by the way), 1/1000th that of rubber, meaning I would have to use about 4000ft of it to negate the improvement from eliminating my rubber lines. With high quality PTFE, the idea that it will give you a "spongy" pedal is a mathematically quantifiable myth.
-Reusable fittings like those made by aeroquip are simple to install and allow lines to be easily replaced on the trail or rerouted without having to buy new fittings (the expensive part)
-My fuzzy math says it would be cheaper than buying an off the shelf hard line kit, especially if you need any of the tee fittings (I do)
-I would think they would actually be more durable than hard steel line. A swivel at every fitting and flexibility across the entire line would reduce vibration induced leaks, and the line wouldn't permanently crimp like hard line if it comes in contact with a rock/etc.
-It would look cool.


I know it is common in the rally and F1 worlds to use whole car ptfe hoses for brakes. It is primarily done for maintenance reasons, but it can't be much/any drop in performance if they are willing to use it in those conditions. I'm curious to hear if anyone on here has any real world experience with making the switch on a 40. Thanks in advance for the info!
-Josh