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Bus Front Brakes: Safety Bulletin
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Hokie87
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PostPosted: Mon Feb 02, 2015 5:15 am    Post subject: Reply with quote

I took off my front tires this weekend to lube the front end and noticed brake fluid on the inside of the right front tire. Everything looked fine, then I remembered this thread. I found the exact same problem.

Image may have been reduced in size. Click image to view fullscreen.


The PO ran the line incorrectly. It runs inside the spring and is not held by the clip (arrow).

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Who.Me?
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PostPosted: Fri Jan 02, 2015 1:50 pm    Post subject: Reply with quote

cdennisg wrote:
guatebus wrote:
cdennisg wrote:
What is the exact length of a straight piece of hard line before bending for this area?


370mm


Thank you.


Hi

Are the bridging line lengths inside the front drums the same for all years' brakes?

I've ordered a kit of Cunifer lines this afternoon from CSP in Germany for a '67 bus with dual circuit brakes. I checked with them before ordering, and they said that their kit includes two 240mm lines for this purpose.

My truck is a '56 but I'm converting to dual circuit brakes at the same time, hence why I've ordered a set of '67 lines.

Which is the correct length? 240mm or 370mm?

Thanks

Andy
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otis_bartleh
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PostPosted: Tue Dec 31, 2013 8:23 am    Post subject: Reply with quote

Definitely a good warning. When replacing the braking system on my bus, the old line on the drivers side was a replacement and poorly bent, and was ready to fail also. I just bent mine by hand as well.
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PostPosted: Mon Dec 30, 2013 7:45 pm    Post subject: Reply with quote

This is a very good heads up. I had a line get nicked the same way but was really due to the hub lock tab breaking and allowing the hub to get loose. Now that spare line is in the box and this is a checklist item on trips.
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64 ragtop volks
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PostPosted: Mon Dec 30, 2013 5:32 pm    Post subject: Reply with quote

The earlier pics are early wheel cylinders 63 down I believe and the last pic of blue bus is 64 and up?
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Culito
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PostPosted: Mon Dec 30, 2013 5:20 pm    Post subject: Reply with quote

LHG wrote:
Here is the disturbing thing. This is the line that almost failed. It appears to have a "factory" bend and it's the original style zinc plated line.
Compare it to the ones Hazetguy posted.

Image may have been reduced in size. Click image to view fullscreen.


hazetguy wrote:
here is one i did, next to a factory original line:
Image may have been reduced in size. Click image to view fullscreen.


.

Two different types of wheel cylinders...
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PostPosted: Sat Jan 21, 2012 9:57 pm    Post subject: Reply with quote

LHG wrote:
Here is the disturbing thing. This is the line that almost failed. It appears to have a "factory" bend and it's the original style zinc plated line.
Compare it to the ones Hazetguy posted.

Image may have been reduced in size. Click image to view fullscreen.


hazetguy wrote:
here is one i did, next to a factory original line:
Image may have been reduced in size. Click image to view fullscreen.


.


Although similar, when looked at in the context of being inside a brake drum assembly with associated hardware, that appearance becomes drastically different.
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I would be interested in knowing the sizes of the various shafts.
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PostPosted: Sat Jan 21, 2012 3:53 pm    Post subject: Reply with quote

I think the inside hub area of some drums, varies in diameter. Its not a machined surface. There isnt alot of room for error either
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LHG
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PostPosted: Sat Jan 21, 2012 3:32 pm    Post subject: Reply with quote

Here is the disturbing thing. This is the line that almost failed. It appears to have a "factory" bend and it's the original style zinc plated line.
Compare it to the ones Hazetguy posted.

Image may have been reduced in size. Click image to view fullscreen.


hazetguy wrote:
here is one i did, next to a factory original line:
Image may have been reduced in size. Click image to view fullscreen.


.

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cdennisg
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PostPosted: Fri Jan 20, 2012 9:37 pm    Post subject: Reply with quote

guatebus wrote:
cdennisg wrote:
What is the exact length of a straight piece of hard line before bending for this area?


370mm


Thank you.
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guatebus
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PostPosted: Fri Jan 20, 2012 9:10 pm    Post subject: Reply with quote

cdennisg wrote:
What is the exact length of a straight piece of hard line before bending for this area?


370mm
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hazetguy
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PostPosted: Fri Jan 20, 2012 9:04 pm    Post subject: Reply with quote

EverettB wrote:
Just curious if you did all those bends without any sort of tool at all?
If not, what sort of "tools" did you use?

Harleyelf wrote:
I use a piece of pipe with a 1" diameter to set the radius on my bends.


i used similar things. smaller diameter round stock (sockets) for the tighter bends, round stock and/or bare hands for the more gradual bends. the key is to go slowly and not crush the tubing.
also, the tubing work hardens when bent, so i try to bend to the "just before it's right" angle and make minor adjustments as necessary. it's really difficult to fix a mess up and the chances of the tubing cracking or breaking increase if you try to straighten out an error.
in the past i have only used the WW kits, and perhaps a kit from Ronnie. the front brake lines were the proper length.
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tyzel
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PostPosted: Fri Jan 20, 2012 8:19 pm    Post subject: Reply with quote

LHG wrote:
tyzel wrote:
Are the ones from wolfs west (WW) pre-bent?


Everything you buy is straight. It's not hard to bend them, you just have to follow the correct path.


That's what I thought, thanks!

and glad you caught that before it turned into a bad situation.
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LHG
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PostPosted: Fri Jan 20, 2012 8:10 pm    Post subject: Reply with quote

tyzel wrote:
Are the ones from wolfs west (WW) pre-bent?


Everything you buy is straight. It's not hard to bend them, you just have to follow the correct path.
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tyzel
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PostPosted: Fri Jan 20, 2012 7:58 pm    Post subject: Reply with quote

Are the ones from wolfs west (WW) pre-bent?
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Harleyelf
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PostPosted: Fri Jan 20, 2012 6:20 pm    Post subject: Reply with quote

I use a piece of pipe with a 1" diameter to set the radius on my bends.
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PostPosted: Fri Jan 20, 2012 4:37 pm    Post subject: Reply with quote

hazetguy wrote:
these bends can be made by hand to factory standards.
here is one i did, next to a factory original line:
Image may have been reduced in size. Click image to view fullscreen.


Just curious if you did all those bends without any sort of tool at all?
If not, what sort of "tools" did you use?
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Culito
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PostPosted: Fri Jan 20, 2012 4:29 pm    Post subject: Reply with quote

When I re-did the brakes getting my SC running, I bought a kit (CIP1, maybe?) that had all the lines in it.
The lines between the wheel cylinders were too short, so they didn't clear everything. As soon as I torqued the bearings down and spun the drum, I knew something wasn't right.
I had to order those two lines from WW.
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jtauxe Premium Member
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PostPosted: Fri Jan 20, 2012 4:02 pm    Post subject: Reply with quote

durfeec wrote:
that line blew for the same reason on my first long trip on my bus. happened to be right next to a cop. she saw the whole thing. i went up and over the curb into an empty parking lot. smashed my brand new muffler.

she came over and asked what happened. i was like i have no idea. they just went out. everything was new. soft lines, hard lines, all new wheel cylinders, pads. i had no idea it was rubbing.

got a ticket for unable to stop in a sure safe distance. 2 points on my license. i went to fight it and because i had done the work and it was an old bus they didnt care it was because of a hole in my brake line. even though i missed everything and everyone.

And your emergency brake was... non-functional?
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cdennisg
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PostPosted: Fri Jan 20, 2012 3:50 pm    Post subject: Reply with quote

What is the exact length of a straight piece of hard line before bending for this area?
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