For all the bike mechanics on here (Are there any?)

[FlippersForFeet]

I need to disassemble a TRP CX9 left brake to put in a new pivot bushing, sprint and spring tension plate/screw, how do i get the existing ones out of the brake arm?

[jsharr ★]

Use a pedal wrench.

[Pokey]

It's titanium. All 28 oz. Waffle head too.

Edited August 21, 2015 by Pokey
Forgot to mention waffle head.

[petitepedal ★]

I have a bunch of park tools...An entire tool box of them...I am sure something in there would work

[maddmaxx ★]

You need an answer in the cafeteria for a problem like this and you start with an insult?

Perhaps I shouldn't tell you then that the pivot bushing is non replaceable and that you will need to buy another pair because they aren't sold individually.

[Former member]

I need to disassemble a TRP CX9 left brake to put in a new pivot bushing, sprint and spring tension plate/screw, how do i get the existing ones out of the brake arm?

Wrong forum. Ask this question on bikeforum.net,  in the mechanics forum

[FlippersForFeet]

You need an answer in the cafeteria for a problem like this and you start with an insult?

Perhaps I shouldn't tell you then that the pivot bushing is non replaceable and that you will need to buy another pair because they aren't sold individually.

Funny, they sell them and they arrive on saturday in the mail :-)

[maddmaxx ★]

Funny, they sell them and they arrive on saturday in the mail :-)

Well good luck then.

That's the knock on the in the mechanics forums.  They're weight weenie light, expensive and hard if not impossible to repair.  Strange really because I like most of TRP's stuff.

Edited August 21, 2015 by maddmaxx

[Dottleshead ★]

Ask Paige.  That gal knows a lot of bike mechanic stuff.

[Former member]

Funny, they sell them and they arrive on saturday in the mail :-)

so you went to the TRP website, and got the parts for $19.95?

[Former member]

so you went to the TRP website, and got the parts for $19.95?

TRP sells the replacement parts, maybe they will give you instructions on how to replace the parts. 

[Page Turner]

Ask Paige.  That gal knows a lot of bike mechanic stuff.

...never done one of those, but if it's titanium, and bushed, It's bushed with a different sort of metal, and that bushing is prolly in there pretttttty solid from galvanic corrosion.  So if it was me (which it ain't, thankfully) I'd soak the sucker in 50/50 atf-acetone for a day or so, then if I didn't have a press, I'd prolly bash it out with a drift or a suitable pin  punch and @Pokey''s hammer.  the new one usually goes in OK with some grease, a couple of pull washers and a nutted bolt of the appropriate size.

But I think there's a good chance that the word about them being disposable is prolly because there's a good chance of fubar in the removal process.  #justguessing

The approved removal process undoubtedly involves some sort of hydraulic press (a lot of people have cheap ones now, thanks to Harbor Freight), and an appropriate diameter socket or two.

(You use one a skosh smaller than the diameter that the bushing measures as the pusher, and a larger one on the bottom for the negative space to receive it.)

[Dottleshead ★]

...never done one of those, but if it's titanium, and bushed, It's bushed with a different sort of metal, and that bushing is prolly in there pretttttty solid from galvanic corrosion.  So if it was me (which it ain't, thankfully) I'd soak the sucker in 50/50 atf-acetone for a day or so, then if I didn't have a press, I'd prolly bash it out with a drift or a suitable pin  punch and @Pokey''s hammer.  the new one usually goes in OK with some grease, a couple of pull washers and a nutted bolt of the appropriate size.

But I think there's a good chance that the word about them being disposable is prolly because there's a good chance of fubar in the removal process.  #justguessing

The approved removal process undoubtedly involves some sort of hydraulic press (a lot of people have cheap ones now, thanks to Harbor Freight), and an appropriate diameter socket or two.

(You use one a skosh smaller than the diameter that the bushing measures as the pusher, and a larger one on the bottom for the negative space to receive it.)

^^^ All Greek

[maddmaxx ★]

^^^ All Greek

Perhaps it was about bicycles.

Don't worry.  We'll find something for you soon.

[Wilbur ★]

^^^ All Greek

Especially that "skoosh" part..

[Page Turner]

...never done one of those, but if it's titanium, and bushed, It's bushed with a different sort of metal, and that bushing is prolly in there pretttttty solid from galvanic corrosion.  So if it was me (which it ain't, thankfully) I'd soak the sucker in 50/50 atf-acetone for a day or so, then if I didn't have a press, I'd prolly bash it out with a drift or a suitable pin  punch and @Pokey''s hammer.  the new one usually goes in OK with some grease, a couple of pull washers and a nutted bolt of the appropriate size.

But I think there's a good chance that the word about them being disposable is prolly because there's a good chance of fubar in the removal process.  #justguessing

The approved removal process undoubtedly involves some sort of hydraulic press (a lot of people have cheap ones now, thanks to Harbor Freight), and an appropriate diameter socket or two.

(You use one a skosh smaller than the diameter that the bushing measures as the pusher, and a larger one on the bottom for the negative space to receive it.)

...you probly already know this, but if you use the acetone/atf stuff, it will eat most plastics and some rubber, so the shoes and any other plastic parts need to be off first.  If you don't want to invest in a whole can of acetone, and have it laying around forever, the next best penetrant is Freeze-Off. (I work on a lot of ancient stuff that's been rode hard and put away wet.)

Depending on the finish on that titanium, sometimes you can heat it enough with a propane torch to get it to expand to the point where it breaks the corrosive bond between the bushing and the brake.

But then you increase your fubar potential, so be careful. Fortunately, it's already broke, so you can't really hurt it. 

 

Especially that "skoosh" part..

...100 % not gay.

[maddmaxx ★]

Sometimes on cars we use amonia.  It evaporates like crazy and cools and shrinks parts like axle shafts that you are trying to pull out of housings with a frozen bearing.