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-   -   Ktm spongy front brakes (http://www.advrider.com/forums/showthread.php?t=834784)

Reino 10-17-2012 09:45 AM

Ktm spongy front brakes
 
This is the link to the tread on ktm talk.


http://ktmtalk.com/index.php?showtop...o%20bolt&st=30

"If you remove the banjo bolt and locate a drill bit the same size as the original hole (pretty close anyway) and use the original hole as a drill guide just go thru the other side of the bolt. The third and forth holes can be easily eyeballed but need to be drilled with a smaller size drill bit. Just go easy and take your time.

I personally drilled the cross set of holes since the bolt was out and I had an extra bolt if I blew it, but I suspect even adding the hole opposite the original might even be enough.

As a pointer for easy drilling use the drills that are known as split points. These will begin cutting easily without walking around. If they aren't available you'll likely want to either use a pilot drill or since the holes is small, slightly center punch the spot you want.

Travis posted a good find that's almost free and very easy to do. It will likely take longer to remove and install the bolt than to drill it. And when you tighten it remember it doesn't hold the rear shock on."

note only use 2mm drill bit, otherwise the bolt will break when tightened.

Basically that banjo bolt has only one hole and sometimes when that hole is not in the correct position there is an air bubble that is trapped. No amount of bleeding will remove that bubble. Also don't drill to many holes.

I also have a fix for the rear axle block cracking on our ktm's, is simple, cheap, lasts long and is very sturdy.
I will make a new thread on this one when i am home during my Nov Jan vacation.

Reino 10-17-2012 10:04 AM

I must admit i have not tried it yet, but i will during my vacation. After i do a lot of this. :freaky and this :snore

jar944 10-17-2012 10:58 AM

None of my KTM's have spongy brakes.

Reino 10-17-2012 11:00 AM

Mine does, its just when that banjo bolt's hole is in the wrong position as to trap an air bubble.

Reino 10-17-2012 11:01 AM

you sure do have a lot of ktm. :eek1

Reino 10-20-2012 05:23 AM

Okay guys i tried this fix and so far so good. I will go riding tomorrow and see if it stays like that . I CAN'T WAIT!:clap

Twin-shocker 10-20-2012 11:56 AM

Quote:

Originally Posted by Reino (Post 19837902)
This is the link to the tread on ktm talk.


http://ktmtalk.com/index.php?showtop...o%20bolt&st=30

"If you remove the banjo bolt and locate a drill bit the same size as the original hole (pretty close anyway) and use the original hole as a drill guide just go thru the other side of the bolt. The third and forth holes can be easily eyeballed but need to be drilled with a smaller size drill bit. Just go easy and take your time.

I personally drilled the cross set of holes since the bolt was out and I had an extra bolt if I blew it, but I suspect even adding the hole opposite the original might even be enough.

As a pointer for easy drilling use the drills that are known as split points. These will begin cutting easily without walking around. If they aren't available you'll likely want to either use a pilot drill or since the holes is small, slightly center punch the spot you want.

Travis posted a good find that's almost free and very easy to do. It will likely take longer to remove and install the bolt than to drill it. And when you tighten it remember it doesn't hold the rear shock on."

note only use 2mm drill bit, otherwise the bolt will break when tightened.

Basically that banjo bolt has only one hole and sometimes when that hole is not in the correct position there is an air bubble that is trapped. No amount of bleeding will remove that bubble. Also don't drill to many holes.

I also have a fix for the rear axle block cracking on our ktm's, is simple, cheap, lasts long and is very sturdy.
I will make a new thread on this one when i am home during my Nov Jan vacation.


If you use a syringe to bleed brakes there is no need for this, and no chance of the banjo bolt snapping when its being tightened.

Reino 10-20-2012 07:03 PM

Quote:

Originally Posted by Twin-shocker (Post 19861327)
If you use a syringe to bleed brakes there is no need for this, and no chance of the banjo bolt snapping when its being tightened.


When the banjo bolt is not in the correct position it does not matter what method you use to bleed the brakes, you can not flush the air bubble out. That is why the mod works, the nissan MS used to replace the standard brembo MS has more than one hole.

This has been documented on the interweb and this fix is apparently the solution to the problem, later today I am going to the mx track to test my brakes and I will report back on the findings.

Reino 10-21-2012 04:32 AM

Been out riding today and this mod worked no more front brake worries!:clap

The Letter J 10-21-2012 06:19 PM

hmmm... I've had spongy brakes on my gasgas and no amount of bleeding seemed to change it. It's the only bike I've ever had this problem with, might be worth a try. Worst case I'll have to buy a new banjo bolt and remove the remains of the old one!

Grreatdog 10-21-2012 08:08 PM

A small bungey cord keeping pressure on the lever while parked also works.

Reino 10-22-2012 12:53 AM

Quote:

Originally Posted by The Letter J (Post 19868740)
hmmm... I've had spongy brakes on my gasgas and no amount of bleeding seemed to change it. It's the only bike I've ever had this problem with, might be worth a try. Worst case I'll have to buy a new banjo bolt and remove the remains of the old one!

When i took out the banjo bolt, i noticed it isn't so weak as i thought. It wont break, as long as you stick with making 3 holes only.

Quote:

Originally Posted by Grreatdog (Post 19869514)
A small bungey cord keeping pressure on the lever while parked also works.

That did not work for me, nothing gets rid of the bubble. It can 't go up into the resiguar, because its trapped in the bolt.

Twin-shocker 10-22-2012 02:58 AM

Quote:

Originally Posted by Reino (Post 19863339)
When the banjo bolt is not in the correct position it does not matter what method you use to bleed the brakes, you can not flush the air bubble out. That is why the mod works, the nissan MS used to replace the standard brembo MS has more than one hole.

This has been documented on the interweb and this fix is apparently the solution to the problem, later today I am going to the mx track to test my brakes and I will report back on the findings.

I have used the syringe method to bleed dirt bike brakes maybe 500 times, and up to now never had a single problem, so wont be risking a broken banjo bolt for no reason.

Reino 10-22-2012 03:13 AM

Quote:

Originally Posted by Twin-shocker (Post 19870942)
I have used the syringe method to bleed dirt bike brakes maybe 500 times, and up to now never had a single problem, so wont be risking a broken banjo bolt for no reason.

nissin blots have more than one hole

I have used this method only, its the best way to bleed the brakes. But it did not help, like in The Letter J's case. This is brake system specific (brembo) problem.

You will not have the same problem on bike that has the nissin brake system. and the banjo bolt is thick enough to not break, if you break the bolt you must have torqued that thing so that hercules could not loosen it.:rofl

http://images.wemoto.com/full/GOODRIDGE/10031848.jpg

http://i.ebayimg.com/t/Brembo-single...hsQ~~60_35.JPG

http://img.auctiva.com/imgdata/6/3/3...4228043_tp.jpg

Look at the photos, they are quite thick. Also like i said THIS IS AN DOCUMENTED FIX.


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