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Muc-Off bleeds out new high-temp, High-Performance Brake Oil

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Most cyclists don’t think twice about the fluid in their hydraulic disc brakes, at least until it starts getting squishy or fading. When the time comes to bleed, Muc-Off has a better option for DOT fluid brakes, with their High-Performance Brake Oil.

Muc-Off High-Performance Brake Oil for DOT hydraulics

When it comes time to bleed our brakes, we typically use whatever originally came with the brake system. Or for that matter, we let out friendly neighborhood bicycle mechanic sort it out. For the most part with hydraulic disc brakes from Avid, Formula, Hayes, Hope or SRAM  that is a DOT 4 or 5.1 fluid.

But now the descriptively named High-Performance Brake Oil from Muc-Off might be a better option. Muc-Off’s unique new glycol-based DOT 4 fluid uses a proprietary mix to outperform every other DOT 4 or 5.1 fluid we’ve seen. With a 327°C dry boiling point & 202°C wet boiling point, that makes it work up to 30-40% higher temps than typical 4.1 fluid, and even 6-21% higher temps than regular DOT 5.1, which had become the industry standard.

That means it should resist brake fade better than any other OEM DOT or Mineral Oil when fresh, and still beat out other DOT fluids over time – making for an ideal solution in the most taxing riding conditions.

Muc-Off actually set out to develop better fluid in direct response to DH & gravity pros they were already supporting who were suffering brake fade and lever pump in competition. The new fluid was developed and tested on the World Cup circuit last year and now is available to consumers.

Muc-Off High-Performance Brake Oil comes in a 250ml bottle and is available now for £20.

Muc-Off.com

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21 Comments
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fabiano
fabiano
4 years ago

smells like a motul rbf 660

Shafty
Shafty
4 years ago
Reply to  fabiano

Same bottle even. Silkolene Pro Race is similar. Most Racing fluids say you should replace more often(sometimes every race), so that performance comes at a price. I’d think that’s standard maintenance if you race regularly.

Gary Land
4 years ago

OK for road disc road brakes where temps can climb rapidly? Will using this alternative fluid void warrantees?

JNH
JNH
4 years ago
Reply to  Gary Land

As long as you replace brake fluid with a like for like spec (Dot 4 in a Dot 4 brake, Dot 5.1 in a Dot 5.1 brake etc) it shouldn’t do. It would take a very skeevy company indeed to try and claim that a Dot 4 brake fluid damaged their supposedly Dot 4 filled brake.

Greg
Greg
4 years ago

Besides temp, dot 5.1 specifies a lower viscosity. Although chemically compatible, brakes intended for 5.1 should stick to 5.1, and brakes designed around dot 4 should use dot 4.

Romka
Romka
4 years ago
Reply to  Greg

And all Sram products got dot 4 or 5.1 sticker on them…

Carl
Carl
4 years ago
Reply to  Greg

I’m thinking this would be good material for a tech article on all the different fluids at some point. I just had to look that up myself since I thought the key difference was just the boiling points.

Bill B
Bill B
4 years ago

This makes sense, if you find your brakes fading due to heat. But at 4-10 times the cost of DOT 4 or 5.1, it doesn’t seem cost effective for most folks.

Matthew
Matthew
4 years ago

Or you could use any of the already available auto or motorcycle racing brake fluids that have a higher dry and wet boiling point.

Maciej Pike-Biegunski
Maciej Pike-Biegunski
4 years ago

You can go to a local auto parts store and buy DOT5 brake fluid. NAPA Silicone DOT 5 is what I suggest if you’re on DOT fluid brakes. Then again, I also suggest Shimano brakes…….

Mike
Mike
4 years ago

Don’t do that, DOT5 is totally incompatible with DOT3,4 or 5.1! DOT5 is silicone based the others glycol-based. see https://en.wikipedia.org/wiki/Brake_fluid

boom
boom
4 years ago

DO NOT use DOT 5. Silicone-based (like DOT 5) is NOT compatible with SRAM products. DOT 4 or 5.1 only.

Keith B
Keith B
4 years ago

DOT 5 is not the same as 5.1 or 4. Don’t use it in place of 5.1.

Nathan Glore
4 years ago
Reply to  Keith B

+1

-s
-s
4 years ago

DOT 5 (the purple stuff) is not compatible! DOT 5 will destroy seals that are designed for DOT 4 or 5.1. Not only does DOT 5 destroy seals, it has a higher compressibility, meaning more brake squish. The only positive about DOT 5 is that it is hydrophobic.

Mikemax99
Mikemax99
4 years ago

The boiling point are not really high compare to Maxima who rate their dot4 to 600F and 410f wet…
seem’s like a good selling pitch but: ”outperform every other DOT 4 or 5.1 fluid we’ve seen” is a big statement!

Scott
Scott
4 years ago

It’s EBC307+ or whoever blends that DOT fluid in the UK. The bottles are exactly the same.

Scott
Scott
4 years ago
Reply to  Scott

going to correct myself. It’s not ebc fluid but is made by it seems probably Morris Lubricants that also makes EBC fluids.

FvsH
FvsH
4 years ago

Mechanical brakes… klamper?

Bob George
Bob George
4 years ago

Wish they had not called it “Brake oil” when it is definitely not oil. Hey, “Brake Fluid” might have been a better name; marketing fail.

Jason
Jason
4 years ago

I’d skip all the noise and use Castrol GT LMA, Pentosin Super DOT4 or ATE Type 200. Better yet given SRAM’s history with their road hydro brakes, ATE SL.6 DOT 4LV fluid – lower viscosity which means better cold performance and level feel, higher dry/wet boiling points(but not as high as Type 200 or Castrol SRF) than regular DOT3/4 and you don’t need to change it as often. That’s if I ever owned brakes that use DOT fluid.

For Shimano, I’ve haven’t touched the brakes on my 29er, but my ‘cross/commuter with TRP HY/RDs uses AeroShell 41 aviation hydraulic fluid. It’s compatible with Shimano and Tektro’s Shell/Idemitsu-supplied ISO 22 hydraulic fluid and it’s also lower viscosity which helps with lever feel and modulation.

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