Tygon 2075/2375 on the Rear Brake

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CoolSparky

CoolSparky

Joined
Feb 20, 2020
Messages
73
Location
Charlotte
If you're thinking about using Tygon on the rear brake line, learn from my mistake.

Failure occurred the first time going out and not even in stop & go traffic. This area obviously gets hotter than 130°F which is what the hose is rated to. Fortunately I was able to get it cleaned off quickly and there doesn't appear to be any damage to the painted fairings.

There's apparently another clear hose called 'LP1500' that's good for 185°F, wonder if that will be high enough for the V4...

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How was it routed before it melted? I'm not seeing one of the rubber ties that's used in the OEM routing.

Edit: Weird. Looks like the R/SL don't route that line the same way.
 
Last edited:
BTrain5489 said:
How was it routed before it melted? I'm not seeing one of the rubber ties that's used in the OEM routing.

Edit: Weird. Looks like the R/SL don't route that line the same way.
Click to expand...

It was routed exactly the same as the stock hose.

Not sure how the R/SL have it, but you can see the rubber tie around what's left of the hose right above the oil fill cap.

Luckily I was able to fit the stock hose back on since I hadn't thrown it away.
 
60219054552__C8B2E04B-8184-4A71-8265-9742BFEF63F4 (1).jpegIMG_0759.jpg

See the two rubber ties? One to tie the hose to the end of the banjo fitting for the master and then another to hold it near the oil fill plug. The line also goes in front of the brake line rather than behind it.
 
Perhaps after doing some ceramic coating on that header, it will be cool enough to run aftermarket hose in that area. I think its one of the reasons the brake fluid bakes black after two days. The heat in that area is just too high.
 
JHTmcrider said:
Perhaps after doing some ceramic coating on that header, it will be cool enough to run aftermarket hose in that area. I think its one of the reasons the brake fluid bakes black after two days. The heat in that area is just too high.
Click to expand...

What about a high heat reflective wrap/tape? I’ve never tried it on brake lines but might be worth a go...
 
Last edited:
I just ordered 12 inch tygon line to use for my clutch hose and front brake line because the stock ones werent long enough after I installed the Ducabike adjustable clipons and had to move my reservoirs around. Can anyone chime in if the Tygon hose will work with my clutch and brake reservoirs up front?
 
I had fancy green Tygon tube on my race bike which was put on by previous owner. They use to weep all the time. Ended up going back to stock (scrutineers at track would check for this lol)
It was hard to find lenghts of tube long enough for the rear res!
 
CoolSparky said:
If you're thinking about using Tygon on the rear brake line, learn from my mistake.

Failure occurred the first time going out and not even in stop & go traffic. This area obviously gets hotter than 130°F which is what the hose is rated to. Fortunately I was able to get it cleaned off quickly and there doesn't appear to be any damage to the painted fairings.

There's apparently another clear hose called 'LP1500' that's good for 185°F, wonder if that will be high enough for the V4...

View attachment 30242

View attachment 30243

View attachment 30244

View attachment 30245
Click to expand...

I posted about this back in 2014. I had Tygon 2375 on my rear brake line when the bike was put on the dyno by Wayne of Tuneboy. This was for a custom tune when I fitted my full Ti Akra. As there was minimal airflow on the dyno the heat from exhaust was enough to melt the tubing. I then tried LP1500 Tygon which has a higher heat rating but that was not suitable for brake fluid and would weep brake fluid after several days. I took photos of that too and posted back then. On the 1199 the Tygon 2375 works fine on the rear brake line as it is far enough away when you are riding the bike and there is airflow. I have been using that way since then. 6 years now. I think with the V4 as that big metal heat shield is so close if it was me I would just go back to stock. I made a light carbon shield for my clear tube on the rear but it was not really necessary. On another dyno run we just put a rag around it during the tuning at it was fine.

As other people have said it is fine up on the clutch and brake lines. You can purchase it in 50 feet lengths from Saint Gobain which is what I did. It is great when bleeding as you can see any tiny bubbles of air in the system.
 
It was discussed a lot before, I also had an issue with the rear, I found out after a 5min ride to the gas station
LP1500 has higher heat resistant but its a fuel hose wont fit brake fluid!

CoolSparky said:
If you're thinking about using Tygon on the rear brake line, learn from my mistake.

Failure occurred the first time going out and not even in stop & go traffic. This area obviously gets hotter than 130°F which is what the hose is rated to. Fortunately I was able to get it cleaned off quickly and there doesn't appear to be any damage to the painted fairings.

There's apparently another clear hose called 'LP1500' that's good for 185°F, wonder if that will be high enough for the V4...

View attachment 30242

View attachment 30243

View attachment 30244

View attachment 30245
Click to expand...
 
Is there a solution for having clear tubing for the rear? I just installed some but haven’t started the bike back up. My option is to reroute it, go back to stock, or try another brand of clear tubing like above.
 

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