954 Caliper Swap Question - Wrist Twisters
 
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post #1 of 25 Old 06-28-2013, 08:08 PM Thread Starter
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954 Caliper Swap Question

Hi everyone, I'm working on swapping my calipers to CBR 954 units and was wondering if someone with more knowledge than I could tell me if these pictures look right. They seem really close and adding any washers throws it way off.









Thanks in advance!

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post #2 of 25 Old 06-28-2013, 08:27 PM
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looks alright to me


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post #3 of 25 Old 06-28-2013, 08:33 PM
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What are the size differences of the 954 calipers vs the 919 as far as the piston size? Otherwise it looks perfect

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post #4 of 25 Old 06-28-2013, 10:00 PM Thread Starter
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Glad to hear. They're about 1mm off center and I wasn't sure if that was acceptable or not. I'll put a mic on the pistons in a little bit and post back.

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post #5 of 25 Old 06-28-2013, 11:17 PM
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I wanna say the stock calipers are not perfectly centered in the calipers either. I didn't know the 945 calipers bolted right up to the stock rotors like that u sure they are 954 calipers?

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post #6 of 25 Old 06-29-2013, 12:43 AM
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now to see if 919 brake lines bolt up, and then 954 master cylinder

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post #7 of 25 Old 06-29-2013, 02:35 AM Thread Starter
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I don't know where the source is now but I remember reading a while back that the 954 and RC51 calipers are the same. There's a few threads here on the RC caliper swap and it lookd pretty straightforward.

I bought a complete brake system for a 954 off of e-bay so master is no problem, just need to replace the fluid reservior. It doesn't leak but theres a few stress lines where one of the mounting screws run through.

I want to take this chance to upgrade to stainless braded lines as well so fitment there shouldn't be an issue.

The only thing left to figure out / buy is that I have a set of the Hong Kong e-bay levers on it now and the brake side doesn't swap to the 954 master cylinder. I might have to buy a second set for the 954 just for the brake side. That and new brake pads of course!

This whole thing started because I needed tires and during the down time I started buying parts, lots of parts. I found a CBR600 f3 front wheel and a 900rr rear wheel on e-bay so I'll be powder coating (or maybe just paint for now) and installing the new tires on those. I also bought a set of rear sets off a member here and a set of Tech Spec tank pads. Maybe one day soon I'll actually get the tires and put this whole thing out of it's misery!

To answer the SoCal Troll's question, I took some measurements of the piston diameters of the stock calipers compared to the 954 calipers. Take in mind these were taken with maybe not the greatest set of calipers which are also in inches and had to be converted to mm. The forward piston in the stock calipers is ≈29.5mm. The rear is ≈27mm. The most forward in the 954 calipers is ≈34mm and the rear is ≈30mm.

If the e-bay seller can be trusted, and based on pictures of the 954 he can, this is definitely a 954 brake system.

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post #8 of 25 Old 06-29-2013, 06:23 AM
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I am running 954 calipers, F4i forks and the F3 wheel on mine.

I am running a similar setup setup on my 919. The 919 brake lines will bolt right up, and as long as there is decent clearance between the rotor and caliper body you are fine.

Do you have the axle spacers required to go with your F3 wheel swap? You will need these to get the wheel centered, then you will need to shim the calipers to match the new wheel spacing.

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post #9 of 25 Old 06-29-2013, 09:35 AM
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And the fun begins


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post #10 of 25 Old 06-29-2013, 12:08 PM Thread Starter
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Thanks for the input HeliMech, maybe it was your setup I remember reading about a while back. I didn't have the axle spacers until just now. Saw your post and headed over to e-bay again.

Are you using the stock master cylinder? I might just do that for now until I can get the lever situation and a new reservoir sorted out, I have to stop spending money at SOME point. (Yeah, right. Who am I kidding?). I might also stick with the stock lines for the time being and do that and the master later.

I've heard good things about PlastiDip and might try it out on the new wheels.
This company is great to deal with and they have some pretty neat stuff.

Voodoo- I have a lot of fun doing this kind of stuff, I just wish it didn't mean down time for the bike!

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post #11 of 25 Old 06-29-2013, 12:41 PM
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I am using the full CBR954RR brake system, so macthing master cylinder and calipers. I have a set of G&J braided stainless lines for a 919, and they bolt right up.

If you use the stock 919 master cylinder the ratio will be out of whack, possibly leading to braking issues......feel and response.

I have a picture of the 919/F3 axle spacers stack up somewhere ..... I can dig it up for you.

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post #12 of 25 Old 08-21-2013, 03:28 PM
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I just bought myself a setup and I am trying to figure out what to do with the master cyl.. Did you just bend the bracket for it to sit completely upright?

*edit*
Just found some info here: https://www.wristtwisters.com/forums/...9-a-31535.html

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post #13 of 25 Old 08-21-2013, 03:36 PM
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The remote brake reservoir bracket just needs to be tweeked a little to get it straight. It doesn't have to be perfectly level except when you take the lid off


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post #14 of 25 Old 08-21-2013, 03:40 PM
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And to keep the information fresh
the 919 has caliper pistons sized 30mm and 27 mm and a M/C of 14mm.

a SP1 RC51 has caliper piston sized 34mm and 32mm and a M/C of 19mm

a SP2 RC51 has caliper pistons sized 32mm and 30mm with a M/C of 17.5mm

929 caliper pistons are 34mm and 30mm with a M/C of 19mm

954 Caliper pistons are 32mm and 30mm with a M/C of 17.5mm

5/8" master cylinder =14mm

11/16" master cylinder = 17.5mm

3/4" master cylinder = 19mm


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post #15 of 25 Old 08-21-2013, 06:47 PM
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so explain the "shimming of the brake calipers". does this make the whole system less rigid? this was talked about on the f4i forks and f3 wheel?

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post #16 of 25 Old 08-21-2013, 08:00 PM
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Quote:
Originally Posted by 919co View Post
so explain the "shimming of the brake calipers". does this make the whole system less rigid? this was talked about on the f4i forks and f3 wheel?
Shimming of the calipers does not affect rigidity, or compromise the system in any way.

What u are "shimming" is the offset of the caliper in relation to the lower fork caliper mounts. What u are trying to acheive is to have the rotor track centered within the caliper body. So that the pistons and pads are working within there optimal range, with no drag or risk of interference between tge rotor and caliper.

If u go to the thread linked above u can see some pics of an install.

When u start mixing and matching parts u will have to shim certain attachment locations to have everything fall back within OEM spec, or as close as possible to it.

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post #17 of 25 Old 08-21-2013, 08:35 PM
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If you shim it too far out, you can strip caliper threads...



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post #18 of 25 Old 08-22-2013, 06:52 PM
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this is what i mean^ is it worth it? clearly this bike is not meant to handle like a rocket....

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post #19 of 25 Old 08-22-2013, 06:59 PM
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Some debate even the caliper swap to begin with.. I should have just changed my fluid but I like buying stuff so yeah. Same cost for the caliper , master and stainless lines for same price as just the front lines (less actually) then 60 for new pads.

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post #20 of 25 Old 08-22-2013, 07:36 PM
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Quote:
Originally Posted by 919co View Post
this is what i mean^ is it worth it? clearly this bike is not meant to handle like a rocket....
Probably the 2nd best thing I ever did to my 919, besides the Ohlins in the rear.

I LOVED my GSXR m/c and RC51 caliper setup.

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post #21 of 25 Old 08-22-2013, 07:37 PM
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So this....

Quote:
Originally Posted by 919co View Post
so explain the "shimming of the brake calipers". does this make the whole system less rigid? this was talked about on the f4i forks and f3 wheel?
Actually means this....


Quote:
Originally Posted by 919co View Post
is it worth it? clearly this bike is not meant to handle like a rocket....
Oh I should have picked up on that..... my bad. :what:



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post #22 of 25 Old 08-22-2013, 08:09 PM
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wasnt tryin to be a smart ass.... i was just saying from a mechanical stand point, not sure i want to shim my calipers when the,whole point in swapping calipers is to increase braking power. thus increasing the stress on said brake parts/suspension parts....

after rolling stoppies for 100ft on my rocket, im not sure shimming brake parts is a good idea when I'm carving canyon roads with deer everywhere.... thats all i meant

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post #23 of 25 Old 08-22-2013, 08:28 PM
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Quote:
Originally Posted by 919co View Post
wasnt tryin to be a smart ass.... i was just saying from a mechanical stand point, not sure i want to shim my calipers when the,whole point in swapping calipers is to increase braking power. thus increasing the stress
Shimming from a engineering and mechanical standpoint is a very common practice.

You are right though and should always take bolt & thread grip length into account. The threads are in the caliper, so if you maintain proper grip length u are good to go.

I have 954rr calipers/master on mine with braided lines, and upgraded fork internals as well.

Off the top of my head I had to shim one side aproximately 0.080" and the oposite side around 0.120". I used longer stainless grade 10 bolts to maintain grip length and keep it all in spec.



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post #24 of 25 Old 07-08-2015, 01:46 PM
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Posting here instead of creating a new thread

Anyone know if the brake lever from the 919 works on the M/C for the 954?

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post #25 of 25 Old 07-08-2015, 02:12 PM
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Quote:
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Posting here instead of creating a new thread

Anyone know if the brake lever from the 919 works on the M/C for the 954?
Nope, completely different design, mechanism & part nos.

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