Brake lines

[Jimbob]

So I just purchased a HEL rear brake line. The bolts the supplied are both shorter than the ones I took out and the 2 bolts they supplied have different thread. Should I just use the original bolts?
Cheers

[user11235813]

I never noticed the different length on my HEL bolts however do be aware that there is a different thread pitch on one of the four bolts. I can't remember which is which, possibly the front bolt at the reservoir end has a finer pitch than the other three bolts.

[Jimbob]

https://imgur.com/a/bak03nC

Here is a link to a pic. The ones of the left are the original the ones on the right are the new ones. You can see they have different thread and are shorter

[user11235813]

Yeah, you're fine using the HEL supplied bolts, that what I used, but check that you have one bolt with the finer pitch thread.

[Jimbob]

One of the bolt has much thicker thread than the others, than bolt doesn't fit

So the 2 original bolts have fine thread, 1 of the new bolts has fine thread but one has much thicker thread and there for doesn't fit

[Jimbob]

Original bolts same thread
https://imgur.com/a/jqibelG

New bolts different thread
https://imgur.com/a/tkf1WSh

[user11235813]

Yeah I remembered one was different but I couldn't remember if it was 3 large pitch and one fine pitch or the other way around. HEL gave me all four the same. So it does appear that they have done it right. It can get annoying if you ride home from the HEL supplier with the wrong bolts and after taking them off the bike you discover that you need one of them changed and you don't have any other transport. As happened to me! I also discovered that the HEL bolts are 14mm I think the OEM are 12 or 13mm so I had to get a 14mm socket too.

So are you only doing the Front or both brake lines? I can't even remember where the odd bolt was front or rear.

[johnny ro]

Suggest, use the ones that can go back in the holes. The originals are fine, these are not wear items. My Galfers, specific to GS500E 1989, had wrong bolts, I reused the originals.

[Jimbob]

Currently I'm only doing the rear, I plan to do the front on the next service when I'll replace the pads as well. So using the bolts from the old line is perfectly fine?

[The Buddha]

Yea use originals - but use new crush washers. They do make different types and threads in brake banjo bolts. Cant screw around with these obviously.
Cool.
Srinath.

[user11235813]

Currently I'm only doing the rear, I plan to do the front on the next service when I'll replace the pads as well. So using the bolts from the old line is perfectly fine?

OK I get it now, yes the rear bolts are the same thread and the front bolts have one with a thicker pitch, that is if I recall correctly the bolt that goes on the disk brake end. So it seems that HEL gave you a pair for the front line. So like others said, you can either use the original bolts, or you can go back to HEL and get one more bolt with the finer pitch for the rear set. Doesn't really matter which way you go. Especially on the back because you don't see them. I still think you're better off using he HEL bolts on the HEL lines. Plus the SS looks nicer.

on the original thread it appears that both front bolts use the 1.00 pitch and the rear has 1 bolt 1.00 and the other 1.25 pitch. weird. http://gstwins.com/gsboard/index.php?topic=70076.msg842607

Oh look more craziness here http://gstwins.com/gsboard/index.php?topic=70315.msg845486#msg845486

[Jimbob]

So I spoke to HEL they said I must have a GS500F (which I don't) because on the GS500 the rear bolts aren't the same. Has anyone else done rear brake lines on a non F model and were the bolts the same?

[max]

When I did HEL lines on my UK '06 GS500E I found that the front bolts were different pitches (M10x1.0 vs 1.25 - http://gstwins.com/gsboard/index.php?topic=72280.msg870352#msg870352) and the rear bolts were both the same pitch.

You can check whether the bolts should/shouldn't be the same by comparing their part numbers on a parts fiche diagram.

[Jimbob]

So just installed the new lines, they look good. First time I've bled the brakes though, in the photo it looks like tiny air bubbles to me is this normal? This is after putting about 400ml of brake fluid through. The pedal lever isn't spongy though so it feels good.

What do you think?
https://imgur.com/a/V8KViXv

[user11235813]

I can't see how you'd see any bubbles through braided lines. However you may as well run through all the fluid until you are sure there's no bubbles left. It can be a bit of a PITA. I got a little one way valve which was a cheap Chinese copy of the motion pro one, worked fine. Sometimes it does feel like you're doing the pump-tighten-release-loosen, dance and not getting anywhere, but eventually you do clear the lines. A one way valve is a big help especially if you don't have an assistant to keep an eye on the level.

Something like this https://www.ebay.com.au/itm/AU-Motorcycle-Car-Clutch-Brake-Bleeder-Hose-Bleeding-One-Way-Valve-Tube-Tool-Kit/174007455829

[johnny ro]

those tiny bubbles might from the hose/bleeder connection. meaning, stop and be happy.

[Jimbob]

Just took it for an hour ride, break feels nice and no leaks thanks for all your help