I'm going to be removing my calipers and replacing the seals/dust covers. I'm really going to paint them but figure I'd do maint now that they are off.
Question: JTIS indicates to replace the brake line after removing it from caliper, Is this really required? Are the threads tension-ed and use once type?

Note: These are Regular XKR brakes, not brembo

 

The flexi pipes to the calipers? They are re-usable but I'd certainly consider replacement of 12 year old pipes for safety reasons. They've taken a lot of pressure over the years.

My preference is always to go with aftermarket stainless steel braided replacements - stronger and look better.

Graham

 

Back in the day, when I worked at Wagner Brake and Lighting Products, the engineers recommended replacing flexible (rubber) brake hoses that show age externally since they can act as an unintentional check valve if small bits of the hose on the inside partially detach themselves. I think they would also recommend replacing them if they are ten years old or older.
Graham recommends replacing with braided stainless hoses: they may not experience the same problem.

 

Ok Thanks and yes I understand the issue about the insides deteriorating. Looks like it's time to find some part #s and sources.

 

It's worth adding a comment here about the contribution of deteriorated flexi hoses to 'soft' brake pedal.

The effect Jim describes of the internal rubber breaking down can cause the flexi to balloon under pressure. The additional fluid filling this 'balloon' therefore reduces the actual pressure applied to the caliper piston giving a soft pedal feel and reduced braking efficiency. When such a flexi is examined without being under pressure, it appears perfectly normal!

I'm always surprised our MoT (the UK annual safety inspection) doesn't require visual inspection of brake flexi pipes under pressure as a check for possible internal failure.

Graham