- 2014 SLX brake problem- help (lever back to bars)
Before I post it back for warranty..
The brake is a 2014 SLX rear brake. The Lever goes back to the bars. The pistons aren’t sticking- when the brake is bled/refilled the fluid is grey/contaminated and escapes but with no obvious source.
I recently had the hose(s) shortened. Could it be an incorrectly fitted olive? The diaphram and hoses etc are as they should be otherwise.Posted 4 years ago
you should be able to see if the fluid escaping past a poorly fitted hose. Not sure why it would still be contaminated if it’s been flushed through by a proper bleed either?
tbh, with most things like this I’d always blame the most recent change if it starts going wrong soon after.Posted 4 years agokhaniMember
Magura fluid is blue, and it’s mineral oil iirc, if they’ve been bled correctly and still not right then warranty, if the shops used dot fluid then they’ve got to sort it out..Posted 4 years ago
Put some bog roll round the hose junctions and squeeze em on and off a few times, if the fluids seeping out it might be a wonky olive..
I use non shimano mineral oil in my SLX brakes and it works ok. I think there are slight difference in densities of the oil between different brands or types of mineral oil but as long as you only use 1 single type (ie not mix 2 types!) in your brake it should be ok…..
I could be wrong though. However my brakes still work and thats the important thing.Posted 4 years ago
You’ve actually voided the warranty by using non Shimano brake fluid. If you’re going to send it back, make sure its flushed through with the Shimano pink fluid!
I think I’ll have a conversation with the bikeshop manager. The same place shortened the hose down the week before. I had zero problems before this.Posted 4 years ago
If it was Magura oil they used then they’re fooked.
Read this, scroll down to Shimano.
I can tell you with absolute certainty that Magura fluid will destroy Shimano brakes in a very short amount of time.
Shimano.Posted 4 years agomildredMember
Funnily enough my 2014’s do this. They were crap out the box but because the hoses needed shortening I was happy to re-bleed them. I have the correct Shimano bleed kit and it’s a job I’ve done many times before – I can get a perfect feel at the lever without any headaches.
Anyway, about every couple of months they need bleeding. I’ve checked all couplings, checked the caliper body was properly torqued together, and I don’t know what else to check. I think they’re just shite put together.Posted 4 years agoBillOddieSubscriber
Sorry, but the whole “MUST USE SHIMANO FLUID!!!” thing is quite frankly bollocks.
Here is why: Hydraulic seals are generally made from PTFE, Nitrile or Viton. They are all fine Mineral based Hydraulic Oils.
I have you Halfords LHM Plus (used on Citreon hydralics for example) in 4 sets of Shimano brakes for Ooooo a decade with no issues.
It’s slightly more viscous than the Shimano stuff so bleeding is a bit more tricky.
I wonder if Shimano’s statement has anything to do with the HUGE amount they mark up their mineral oil. It certainly reeks of “don’t sue me or ask for warranty” if you use “their” fluid.
I would be very interested in what Shimano make their seals out of if they can be affected by using a different brand of mineral oil.Posted 4 years ago
Nitrile gets killed very quickly by DOT. My guess they are Nitrile, hence the only use our fluid to stop idiots using DOT.
Bill, I have used Cyclo oil in the past with no issues, it doesn’t alter the fact that Magura oil rots Shimano seals, I suggest we both got lucky in our choice of oils.
It’s neither a seal issue or an oil issue, its an incompatibility issue between the two and it’s definitely not bollocks.Posted 4 years agoEcky-ThumpMember
Ignoring Hora’s problems for a minute… I found that linked article really interesting. The final postscript Q&A about how the free stroke on a Shimano works clarifies a lot too.
Having previously been an advocate of LHM and having used it for a few years in previous generation Shimano brakes, I am happy to declare that I have today had my mind changed by a well articulated discussion on t’interweb. 😯
I’m also glad I bought a big bottle of Shimano oil when I started using M785 XTsPosted 4 years ago
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