Mechanics Quick Question Thread [Ask Questions Here]

PB Forum :: Mechanics' Lounge
Mechanics Quick Question Thread [Ask Questions Here]
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Posted: Jun 23, 2022 at 8:03 Quote
@Padi, have you already got the G2 RSC brakes yet?

Posted: Jun 23, 2022 at 10:45 Quote
Thanks guys, that’s what I thought! Hoped that I was wrong though!

@Mordacai, yes, I already have a set of G2 RSC:s that are already shortened and bled. I’ve already replaced the front brake, only rear brake left.

Posted: Jun 23, 2022 at 10:48 Quote
@Padi, I was hoping that you hadn't as there may have been another option.

But you've got to work with what you have, just kind of sucks that you need a more specialised bleed kit with SRAM.

Posted: Jun 23, 2022 at 23:00 Quote
I’d say that with ownership of any brake, a bleed kit and some fluid is a necessity. They feel much better when they’re consistently bled, and it’s not a complex job. Lots of internet resources and videos to help you out if you’re unsure.

Holding the lever closed overnight and doing a bleed of the lever only will likely be enough to get your new brakes up and running after the install, if it’s in any way easier for you to source one bleed syringe.

Posted: Jun 24, 2022 at 6:12 Quote
@riish, I'm really starting to like HOPE brakes. As there's no need for any kit really, apart from some tubing or hose for the bleed nipples.

Had to learn how to bleed brakes recently as had to do a full overhaul and service on some HOPE brakes, and they were a lot easier than expected.

It was just keep topping up the reservoir while pulling the lever with the bleed nipple open, then closing the bleed nipple before releasing the lever.

Posted: Jun 24, 2022 at 10:27 Quote
Another stupid question that I cannot find an answer to. Like I said, I have G2 RSC:s for my trail bike. However, I have XTR/Saint brakes on my FR bike. Will I be able to bleed both with Sram’s Pro bleed kit? They require their own oils (DOT4 or 5.1 for Sram, mineral for the Shimanos), but is the bleed kit itself compatible for both? If not, is there one type of bleed kit I could use for both?

Posted: Jun 24, 2022 at 10:36 Quote
That I wouldn't know on fittings, but Shimano use mineral oil and SRAM uses DOT brake fluid and they don't mix.

So I'd assume if the fittings are the same, it would work with a really good cleaning between using on the different systems.

Posted: Jun 24, 2022 at 10:43 Quote
Padi wrote:
Another stupid question that I cannot find an answer to. Like I said, I have G2 RSC:s for my trail bike. However, I have XTR/Saint brakes on my FR bike. Will I be able to bleed both with Sram’s Pro bleed kit? They require their own oils (DOT4 or 5.1 for Sram, mineral for the Shimanos), but is the bleed kit itself compatible for both? If not, is there one type of bleed kit I could use for both?
no, once you contaminate it with mineral oil or dot fluid thats pretty much it.

Posted: Jun 24, 2022 at 11:02 Quote
Anyone know why the ifp on my durolux r2c2 is binding? Has anyone else had this problem? Opened it up and foubd that it is just the piston being too tight; does anyone know of a fix? Is there anywhere I can buy just the piston? I have been looking on the internet and I can only see full cartridges rather than parts… Any help is welcome.

Posted: Jun 24, 2022 at 11:30 Quote
Padi wrote:
Will I be able to bleed both with Sram’s Pro bleed kit? They require their own oils (DOT4 or 5.1 for Sram, mineral for the Shimanos), but is the bleed kit itself compatible for both? If not, is there one type of bleed kit I could use for both?

SRAM Pro bleed kit won't work on Shimano. Shimano is typically bled differently using a funnel device on the lever where SRAM uses a pair of syringes. Recommend you Google some 'how to bleed...' videos and you'll see what I mean.

And, as stated earlier, the DOT fluid and the mineral oil are not compatible - you'll need two different bottles of juice for your two different kinds of brakes.

HOWEVER - you can get mineral oil super cheap at any pharmacy and you can get DOT fluid super cheap at any auto parts store so that's not a big deal. If you want to experiment with using just one fluid for both then go for it. There's a video where Seth Bike Hacks used plain old baby oil in his Shimano brakes without any problems, but I don't think anyone would openly advocate that direction.

Is there a universal kit that fits both brake types? I've never looked, but I'll bet you can find it on Amazon or equivalent... if it exists.

Good luck.

Posted: Jun 24, 2022 at 11:40 Quote
LuisCT wrote:
Anyone know why the ifp on my durolux r2c2 is binding? Has anyone else had this problem? Opened it up and foubd that it is just the piston being too tight; does anyone know of a fix? Is there anywhere I can buy just the piston? I have been looking on the internet and I can only see full cartridges rather than parts… Any help is welcome.

Send an email to Suntour or you may need to send it in to a warranty center.

Posted: Jun 24, 2022 at 13:05 Quote
@BenLow2019, you can't use one fluid for all brakes unfortunately due to the seals used. Otherwise "interesting" things happen to the seals.

Posted: Jun 24, 2022 at 13:34 Quote
M0rd4c4i wrote:
@BenLow2019, you can't use one fluid for all brakes unfortunately due to the seals used. Otherwise "interesting" things happen to the seals.

Yeah... I think I wrote that they are not compatible, but if the rider wants to experiment then go for it - it's a free world - recognizing that nobody would advocate the process.

Even though the fluids are not compatible and manufacturers will never recommend swapping fluids there have been plenty of individuals that have done just that. Their results vary from catastrophic to no noticeable difference for years. There's plenty of discussion on the topic around the interwebs.

The rider can choose his own adventure.

Posted: Jun 24, 2022 at 17:35 Quote
@BenLow2019, you're best keeping to the basic specs.

So with systems that use oil you can use various oils without any real issues, but DOT fluid will mess up all seals.

And vice versa for DOT systems.

Last thing you need happening is a seal failing in style and blowing when you're heavy braking.

Silicone, now that's different.

Posted: Jun 24, 2022 at 18:50 Quote
Yeah if you “choose your own adventure” between shimano and sram brakes, your adventure will be not slowing down and crashing.


 
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