Twin front brake lines fitting

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Twin front brake lines fitting

Postby duke63 » 31 Dec 2017, 19:45

So changing the front brake lines on the 748 from a single from the Brake m/c to a twin racing style set up.

Should i fit the ends at the brake m/c as follows:

Bolt
Copper washer
First brake line
Copper washer
Second brake line
copper washer
Brake m/c

I only ask as there seems to be an extra copper washer in the packet if i do this and was wondering whether i should fit two copper washers between the two brake lines.
if there wasn't a spare washer in the packet i wouldn't even have thought about it but since there is.......... :?
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Re: Twin front brake lines fitting

Postby Blade » 31 Dec 2017, 19:49

No stay with the 3 washer set up you have suggested Duke.

Thu have packaged a spare in which is very common.
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Re: Twin front brake lines fitting

Postby duke63 » 31 Dec 2017, 20:07

Cheers Blade. Thought it would be but the spare threw me.

I'm thinking of replacing the bolts on the calipers too. Pinch bolts, pad pins and caliper bolts.

Not cheap but since the bike is staying with me, it seems a decent investment.

The originals are nearly 20 years old now.
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Re: Twin front brake lines fitting

Postby duke63 » 01 Jan 2018, 13:38

Has anyone replaced the pinch bolts on calipers before? Seems straightforward enough but is there any downside to removing these bolts on such an important part?

Would guess replacing one at a time is the way to go so as not to split the caliper.
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Re: Twin front brake lines fitting

Postby Kwacky » 01 Jan 2018, 13:50

I've done it. Like you I did one at a time. Double check you've got the right torque. If I can do it you know it's a straight forward job.
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Re: Twin front brake lines fitting

Postby Blade » 01 Jan 2018, 16:54

I would probably replace at the time I was stripping and servicng the calipers but if you wanted to do the job adhoc so to speak, I would clamp the caliper at the end your removing the bolt.

Put some soft material to stop the calipers getting marked then lightly apply a G clamp to prevent any risk of the calipers opening up slightly when releasing bolt tension.

I wouldn't worry about loosing a bit of fluid or drawing any air in as a quick bleed would easily remedied either of these issues. I would apply the G clamp to ensure the two halves are square when you re tighten one of the bolts at a time and prevent any risk of the alloy body cracking, which tbh is very unlikely.
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