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Author Topic: disc caliper reversal.  (Read 10018 times)

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Offline cben750f0

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disc caliper reversal.
« on: July 12, 2005, 04:18:48 AM »
just thought i would show you guya what i was up to this arvo... put the calipers on the back of the forks... got all the parts together... took a while... and fitted it today.. hope you like...peace
« Last Edit: December 27, 2006, 03:41:38 AM by Glenn Stauffer »
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Offline Bob Wessner

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Re: disc caliper reversal.
« Reply #1 on: July 12, 2005, 04:37:14 AM »
Mind you, these questions are from someone who knows zip about brake design/engineering.

1) Did you do this for appearance sake, or is there a braking advantage?
2) Did you notice any change in handling? It would seem the mass is now behind the axle line rather than more or less directly over it as in the stock position?
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Offline Jonesy

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Re: disc caliper reversal.
« Reply #2 on: July 12, 2005, 04:49:03 AM »
Might make changing the fork oil a bit more interesting... (drain port location change)
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #3 on: July 12, 2005, 05:08:36 AM »
apparently the brakeing force push the forks forward, and the tire is trying to roll under the bike ... when the caliper is on top its trying pull the lot under the bike.... thats what i have been told.... havent tred rideing it yet... will let you knows.. though have seen the resaults of a cb that is raced in classics, the had the calipers on the top of the forks nad when he broke hard, snapped the forks off....so will let you know tomorrow..peace
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Offline Jonesy

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Re: disc caliper reversal.
« Reply #4 on: July 12, 2005, 05:14:27 AM »
Having the calipers under the fork like that is better... I don't think you can find a single bike on the market that has calipers mounted ahead of the fork anymore.
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Offline Bob Wessner

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Re: disc caliper reversal.
« Reply #5 on: July 12, 2005, 05:16:34 AM »
Now that you mention it, that does seem to be the norm today.
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Offline Tim.

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Re: disc caliper reversal.
« Reply #6 on: July 12, 2005, 06:37:46 AM »
I'd like a bit of a blow-by-blow of the process if you don't mind.  I've seen this mod on many of our bikes, and have considered doing it myself on my 550.
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Offline SteveD CB500F

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Re: disc caliper reversal.
« Reply #7 on: July 12, 2005, 06:59:56 AM »
Good idea.

Blow by blow (with pictures?) - I'll put in the FAQs and you'll be famous forever!
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #8 on: July 12, 2005, 07:10:24 AM »
pic 1 is the start...



pic 2 :- have swapped the forks over..eg left to right
« Last Edit: December 27, 2006, 03:44:17 AM by Glenn Stauffer »
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #9 on: July 12, 2005, 07:20:25 AM »
now i am running a dual disc set up... you guys that are running single disc need to remember that you are going to have to set up your other fork leg for a calipar arm... this isnt a straight bolt up situation and is a bit of stuffing round.... will post a document on what i did for the dual disc set up... it is relivant to this set up aswell... just give me a bit to get it set ok...

PIC 3:- shows the calipar arms in place and a guard mount... you need to get an old rust guard and grind the rivits off it, so you are left with the hangar... you will also have to remove the brake line holder... as it will be pointing out the front!!!.

pic 4:-  this is the stainless guard i piced up off ebay... was a total fluke... and is slotted for screws... again this is an after market part that i thought was a factory part when i bought it... NEway, here i am dummying the guard so i can mark the hanger for drilling and tapping...
« Last Edit: December 27, 2006, 03:51:49 AM by Glenn Stauffer »
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #10 on: July 12, 2005, 07:26:50 AM »
pic 5:- drilling 5mm holes to be tapped out to M6.... there are 4 holes, and if you have dummied it up right will bolt onto your guard.


pic 6:- this is what it looks like from the top... there are 4 M6 dome head socket head cap screws.... i used 10mm long ones, but cut them back so they didnt hang out the bottom too far... bolt, measure,remove,cut,and replace... dont forget to screw a nut on the bolt b4 you cut it off... makes it easier to repair the thread... does it when you take the nut off...easy.
« Last Edit: December 27, 2006, 03:54:39 AM by Glenn Stauffer »
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #11 on: July 12, 2005, 07:32:39 AM »
pic 7:- this is what it looks like when finished.... the brake lines need to be loosened at the caliper and the brake hose to steel line join, and the calipers have to be turned 180 degrees, so they bolt up properly.... you then have to hand bend the steel line so it looks hal decent... i have double zip tied mine to the guard mount for the moment till i can figure out how to make a mount to the line.... this is to restrict movement of the steel line... it wasnt designed to flex with suspension travel...you will probably need a bunch of 6mm washers, 5mm washers... and some other bolts and stuff... just hand to have anyway.. any questions... give me a yel... will post the dual disc doco aswell...peace
« Last Edit: December 27, 2006, 03:55:45 AM by Glenn Stauffer »
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you are never to old, to act like a kid... be safe
funny thing,chasing someone down hill on a bike 30 years older than theirs..
he said \\\\\\\'it was like watching a 250kg unguided weapon getting stuck up you bum\\\\\\\ http://www.bikepics.com/members/trixtrem/

Offline Mark M

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Re: disc caliper reversal.
« Reply #12 on: July 12, 2005, 07:42:51 AM »
A very neet job indeed, but I would be a little worried that you are now asking the parts to work in a totaly different way.
Are you sure it's safe to push the caliper mounting pins, as STD they are being pulled which will be quite different stresses. Also I have read elsewhere of problems with wheel hubs when doing something simmilar with old Triumphs, although I didn't get my head round what the effect was on the hub.   
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #13 on: July 12, 2005, 07:50:43 AM »
i have seen this on the track.... and figured it was ok... as long as you are useing good bolts( the right tensial strength)... for the application, i dont see a problem with either pushing or pulling.... apparently this was a common mode way back b4  i was born.. :P... other wise i really couldnt tell you...cool?
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Offline kyre

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Re: disc caliper reversal.
« Reply #14 on: July 12, 2005, 01:14:22 PM »
I have this set-up on my 75 cb400F (550 front end conversion w/dual disks) I've been riding it for about a year now and frickin love it! I'm not sure if it brakes better with the calipers flipped cuz I changed the front end and put duals at the same time but braking is double of what it used to be. I want to get the disks drilled soon too since the front end is very heavy due to the duals now. I've had no problems with the calipers flipped though.
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Offline pablo78cb550

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Re: disc caliper reversal.
« Reply #15 on: July 12, 2005, 01:19:50 PM »
do you have the dual disc step by step?
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Re: disc caliper reversal.
« Reply #16 on: July 12, 2005, 01:23:02 PM »
Yeah I am looking to do the dually job too. Then maybe swap the calipers some time. This stuff should be put in the FAQs.
As long as it is for a 750 I will be happy! I suppose once the dually is done for the 750 someone can do the others. We should all be able to take advantage of this info.
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #17 on: July 12, 2005, 02:18:13 PM »
to those guys that have got the double set up... drilling holes makes bugger all difference to the weight.... i drilled about 80 12mm(1/2in) holes in mine.... still weighs more that a car mag wheel!!!!!.. but it does help whem braking in the rain.... we all know how the ol girls hate the rain... it seems to get the water off the disc, without that... nothing, nothing,nothing...locked front wheel problem.... plus i think it looks cool with holes... :P ::)..peace
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you are never to old, to act like a kid... be safe
funny thing,chasing someone down hill on a bike 30 years older than theirs..
he said \\\\\\\'it was like watching a 250kg unguided weapon getting stuck up you bum\\\\\\\ http://www.bikepics.com/members/trixtrem/

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Re: disc caliper reversal.
« Reply #18 on: July 12, 2005, 04:51:45 PM »
Damn it cben. Is that all you have to do with your life/bike? Too good for me mate! I suppose it it works and it feels good - then do it. As for me, my philosophies are that the K2 was built best first, and if it ain't broke then don't fix it. BTW, have you run into Al in Lavington lately? Tell him I send my regards - please. Does he still have the red K in his workshop? Spear  :D
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #19 on: July 12, 2005, 08:17:27 PM »
yeah mate.. am still on rehab... so got heaps of time... though am looking at getting a frame and returning the F 1 back to standard... then racing up the other CB.... Al is still good...
« Last Edit: July 15, 2005, 03:45:52 AM by cben750f1 »
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you are never to old, to act like a kid... be safe
funny thing,chasing someone down hill on a bike 30 years older than theirs..
he said \\\\\\\'it was like watching a 250kg unguided weapon getting stuck up you bum\\\\\\\ http://www.bikepics.com/members/trixtrem/

Offline Terry in Australia

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Re: disc caliper reversal.
« Reply #20 on: July 12, 2005, 08:57:28 PM »
Looks good Ben, and yeah, we all did that back in the 70's, no real advantage apart from aesthetics though from my experience. Did you modify that front fender because you wanted to keep yours intact, or didn't the holes line up when you reversed it? I'm not sure the twin brace fender is a good look on an F1? Otherwise, good job! Cheers, Terry. ;D
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #21 on: July 12, 2005, 09:50:11 PM »
na dont like the twin brace either, but its the only spare guard i had, and it had holes in it... so i covered them up....you cant just turn the guard.. you have to remover the hanger.... NEway, am looking to chop the front of the guard so that i can loose the front brace... but for the moment it can stay there.... peace
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he said \\\\\\\'it was like watching a 250kg unguided weapon getting stuck up you bum\\\\\\\ http://www.bikepics.com/members/trixtrem/

Offline Terry in Australia

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Re: disc caliper reversal.
« Reply #22 on: July 12, 2005, 10:57:17 PM »
Do you want an F1 front fender? I have one NOS OEM item, and at least one (maybe more) US sourced used item? I need a good used tail light and bracket for my K2, and a "grab handle, if you know of one? Cheers, Terry. ;D
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Offline cben750f0

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Re: disc caliper reversal.
« Reply #23 on: July 13, 2005, 04:19:47 AM »
thanks anyway terry, but this isnt a honda guard.. so dont feel so bad about cutting it... should look alright when finished up, am getting som brake line hangers made of stainless from a bloke at work, so that will do away with the zip ties... BTW i dont know why, but the bike brakes better, for some reason it has more...'feel'.. i dunno how to explain it, .. the brakes seem to bit better, and have lost alot of the woody feel that they had b4... i can explain it... but am happy that it worked so well... peace
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funny thing,chasing someone down hill on a bike 30 years older than theirs..
he said \\\\\\\'it was like watching a 250kg unguided weapon getting stuck up you bum\\\\\\\ http://www.bikepics.com/members/trixtrem/

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Re: disc caliper reversal.
« Reply #24 on: July 13, 2005, 12:40:42 PM »
Sweet mod.  I'm full of questions.  Do you still use the stock master cylinder?  How do you split the line into 2?  Do you have any issues with brake drag or squeal?  And finally, are those holes in the rotors beveled?
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