Topic: Brake line quick question

[xsmooth69x]

soooo this is my first time posting but ive been like a huge lurker 

anyways when replacing the brake lines with braided lines i understand you replace the line from the caliper to the three way block but do you also need to replace the line from the 3 way block to the master cylinder?



my awesome art skillz. so the line in question is in green

[Markcb750]

I would but as long as it is not showing significant dry rot or abrasion it is not absolutely necessary.  Going fast on 30YO hoses is not the best idea, but I do it...

[cookindaddy]

Well, you don't say what bike model or year it is, but maybe it does not matter.

I think it would depend on the condition of the existing brake line and it's age. If you were going to replace one brake line, why not replace them both? "pampadori" here makes excellent replacement brake lines from modern components and they are excellent (I am a happy customer).

Not all bikes have the arrangement you so skillfully drew. On the 750 K7 it is as you show. On the 78, there is no junction block and the brake switch is up in the master cylinder.

Welcome to our nut house. Drive safe and keep your bike safe.

[Hannibal Smith]

I would definitely run another braided section (finances permitting). This ensures you get the full benefits of the braided line. Half/half still has the mush factor of the old line.

[xsmooth69x]

the bike has been buried for 30 years im building it from the ground up  im also doing a dual disc brake setup so ill have to buy 3 lines $$$$$ ouch

i updated my siggy too after i posted and wow you guys are fast on the response!!!!

[Hannibal Smith]

the bike has been buried for 30 years im building it from the ground up  im also doing a dual disc brake setup so ill have to buy 3 lines $$$$$ ouch

i updated my siggy too after i posted and wow you guys are fast on the response!!!!

If you are going dual disc, stop the presses.

You can double up the banjo at the MC, or run from a manifold- If you just SS line your single disc, you might very well end up purchasing 4 new lines! (with one collecting dust).

[xsmooth69x]

lol han i have no idea what you just said 

stop the press? why 4 lines?

disc 1> line 1>double banjo>tri block> line 3>MC
disc 2> line 2^

[bikerbart]

I bought a modern cbr600r master cylinder,which has an electronic switch,did away with the junction and ran one clean braided line with rebuilt caliper,now I have modern(almost)brakes.

[bikerbart]

here are some pics

[hesselfuzz]

Dual disc systems have a larger diameter master cylinder bore to move more fluid. The 78 750 F2 comes with one but I don't have a part number.

Ciao

[xsmooth69x]

ya from what i read the dual disk MC is a 5/8

you posted pics i wasnt going to bother you for them but thats awesome!!