USD fork brake mount removal.

RetroGrouch

RetroGrouch

Well-known member
Site Supporter
How do you remove the bottom part of the fork with the calliper mount? I see a small torx bolt but is the part just press fit into the slider or is it threaded? Do I need to take it to a machinist or fork rebuilder? Can I install the part on any other slider that's the same diameter? I'd like to upgrade the forks but want to keep the brake mounts.

222709_10150246421922674_631952673_9376980_1910847_n.jpg
 
Last edited:
RetroGrouch said:
How do you remove the bottom part of the fork with the calliper mount? I see a small torx bolt but is the part just press fit into the slider or is it threaded? Do I need to take it to a machinist or fork rebuilder? Can I install the part on any other slider that's the same diameter? I'd like to upgrade the forks but want to keep the brake mounts.

222709_10150246421922674_631952673_9376980_1910847_n.jpg
Click to expand...

They are threaded into the chrome tubes, the screw on the inside is a set screw to help keep it from loosening. Some have them some just use thread sealing comound..Depending on what brand/model forks your talking about they can have different threads...So not all are interchangeable...

Sometimes they come loose on my stunt bikes, so I have to take them apart clean the threads, and retighten with some new thread locking compound...When you take the forks apart there will be a hole through the chrome tube near the top, what you do is slide a rod through that and use it to turn it. Sometimes you will require heat, and sometimes they are just a pain in the *** to unthread....
IMG_0375.jpg
 
Last edited:
Typically there will be a bolt, that you can't see while the axle is in place, that's up inside the bottom of the fork. You might want to consider either rebuilding or replacing the stock internals, first, before you start swapping out forks though. What bike is it?
 
Rob MacLennan said:
Typically there will be a bolt, that you can't see while the axle is in place, that's up inside the bottom of the fork. You might want to consider either rebuilding or replacing the stock internals, first, before you start swapping out forks though. What bike is it?
Click to expand...

That is a banjo bolt, and it only holds the internals down to the fork bottom, its not what holds the chrome tube to the fork bottom...
 
JohnnyP636 said:
That is a banjo bolt, and it only holds the internals down to the fork bottom, its not what holds the chrome tube to the fork bottom...
Click to expand...

Gotcha. I'd have looked in the specific shop manual, if I'd known what bike it was, but that wasn't mentioned. I've only worked on RSU forks so far anyway.
 
It's a non-adjustable Showa 41mm fork on a 94 Monster 900. I disassembled one fork to replace the seals and wasn't too impressed with the internals. Seemed really low-tech. I'd like to use an adjustable front end from a later Ducati but want to keep the brakes.

Thanks for the info.
 
Rob MacLennan said:
Gotcha. I'd have looked in the specific shop manual, if I'd known what bike it was, but that wasn't mentioned. I've only worked on RSU forks so far anyway.
Click to expand...

All USD are very similar in design, and normally people never separate the chrome from the bottom. If you want a new tube or bottom only, you have to buy it complete together. I have never seen a manufacture yet that sells the bottom or chrome tube separate...And Ive also never seen a service manual that shows how to separate them.

So even if you look at service manuals or parts fiche's, they will not show the 2 parts separated
 
Last edited:
JohnnyP636 said:
All USD are very similar in design, and normally people never separate the chrome from the bottom. If you want a new tube or bottom only, you have to buy it complete together. I have never seen a manufacture yet that sells the bottom or chrome tube separate...And Ive also never seen a service manual that shows how to separate them.

So even if you look at service manuals or parts fiche's, they will not show the 2 parts separated
Click to expand...

I just checked a couple and I see what you mean. Obviously intended to be factory assembled, only.

I also checked Bitubo and Traxxion, and neither seem to list a set of internals for Monster 600 forks. I'll bet the Traxxion has experience with them though.
 
Both Traxxion and Bitubo make cartridge kits that involve simply gutting the fork, then replacing them with a sealed cartridge unit, which is why I checked them first. I turned the damper rod forks on my ER-6n into cartridge forks with a few hours work, and a set of inserts from Bitubo. If I'd had all the necessary tools and bought a vowel, I'd have likely been able to do it in an hour and a half.
 
Rob MacLennan said:
Both Traxxion and Bitubo make cartridge kits that involve simply gutting the fork, then replacing them with a sealed cartridge unit, which is why I checked them first. I turned the damper rod forks on my ER-6n into cartridge forks with a few hours work, and a set of inserts from Bitubo. If I'd had all the necessary tools and bought a vowel, I'd have likely been able to do it in an hour and a half.
Click to expand...

Id go that route if possible, someone has already done the R&D for yo,u and you dont have to find out the hard way if what your doing is going to work or not...
 
You must log in or register to reply here.

Back
Top Bottom