C5Natie

The big brake kit I just ordered says it comes with 3 pints of Motul Race brake fluid. Its probably the 600 but we'll see. Thing is Motul says its not to be used on street vehicles and bled before and after every track event. My question is, why isnt it recommended for the street? Thanks.

Wickster

Not sure why Motul would say that but I have used it for several years in my street cars, very good stuff.

Motul was the only brand I would use during my motorcycle racing daying. Nothing is harder on rear brake fluid than a 3-4 hour cross country/hare scramble/enduro in the mud as you drag the rear brake in some sections. I saw more than one guy stopped on the side of the trail pissing on his rear caliper trying to get his brake back.

C5Natie

Good to know because I read this and wondered,

"Racing - RBF 600 - Racing DOT 4*- Extreme high performance polyglycol brake fluid. Far exceeds the standards of DOT 4. The package is filled with Nitrogen, increasing shelf life and eliminating contamination while factory sealed. Extremely high dry boiling point helps prevent vapor lock and brake fade during hard use, with excellent recovery time. 313°C dry - 216°C wet.
Recommendations:*This is a racing brake fluid designed for track use only and should not be used on street vehicles. Fluid should be bled and replaced before and after track events."

BryanPendleton

I run Motul 600 in my C5 which is my daily and track car. I flush often though.

sevinn

I'd have to guess there are 2 reasons behind this:

1: Dot 4 fluids absorb water fairly quickly so if you left it in between track sessions it would only be good to its wet boiling point and the message is merely a safety precaution so that you don't try to use it for track periods that are severely spaced apart.

2: This messages probably makes them sell more brake fluid

C5Natie

Ive been using Wagner heavy duty synthetic dot 5.1 with good results. Wonder how it stacks up vs Motul 600.

BryanPendleton

This is more than likely the reason for that warning on Motul's part. They have to publish the operational parameters for their product. The Motul RBF 600 has extremely desireable specs, but those ratings are quickly deteriated with the absorption of moisture.

For the street, even "wet" Motul is probably more than adequate, but take "wet" Motul to the track and you probably have a recipe for issues. Hince the warning. If you bleed your system before track events, you should be fine. I have not had any issues with this practice.

argonaut

Just as an FYI: the new C7 specifies Dot4 fluid - it says so right on the cap for the brake master cylinder. So apparently GM doesn't worry about Dot4 absorbing too much water.

froggy47

Most very high dry rated RACE fluids have relatively poor wet ratings. Street fluids have relatively better wet ratings because they can sit in a system 5 yrs and never get changed.

The poor wet ratings don't matter as you are expected to replace the fluid "often"

If you replace "often" of course there is no problem using them on the street.

RX-Ben

Motul 600 is pretty good wet. Never had any issues on the track and I bled occasionally.

DRY:401F -- WET:284F --- DOT3 MINIMUM
DRY:527F -- WET:302F --- AP RACING 551
DRY:446F -- WET:311F --- DOT4 MINIMUM
DRY:502F -- WET:343F --- VALVOLINE SYNPOWER
DRY:500F -- WET:356F --- DOT5 MINIMUM
DRY:509F -- WET:365F --- MOTUL 5.1
DRY:536F -- WET:392F --- ATE SUPERBLUE/TYP200
DRY:590F -- WET:410F --- AP RACING 600
DRY:593F -- WET:420F --- MOTUL RBF600
DRY:610F -- WET:421F --- NEO-SYNTHETIC SUPER DOT 610
DRY:620F -- WET:425F --- COBALT SUPER XRF
DRY:590F -- WET:518F --- CASTROL SRF

rustyguns

rustyguns

I use castrol SRf - 25 to 30 track days a year. only flush it once year. doesn't need it. but i do it to make it look pretty and clear again. The stuff is magic !

SouthernSon

I like the amsoil 600: 580/380

http://www.amsoil.com/shop/by-produc...g-brake-fluid/

C5Natie

Well I got the fluid today. They sent me Motul 5.1. Ive done hpde with 5.1. Anyone use Motul 5.1 before?

RDnomorecobra

You can't use dot 5 fluid can you?

C66 Racing

I use this as well:
AMSOIL Series 600 DOT 4 Racing Brake Fluid (Product Code BF4SN)
Dry Boiling Point - 580F, Wet Boiling Point - 380F

DOT 5 is silicone based and shouldn't be mixed with DOT 5.1, 4, and 3. I've never used 5.1 but it uses the same base fluid (Polyethylene Glycol) as DOT 4 and 3.

More than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.

MarkDFW

the WET boiling point is what matters most in DOT 4 fluid for a track car. There's a reason so many racers pay $65/bottle for Castrol SRF: the very high wet boiling point and it's ability to reject water so well. I bleed twice a year before the spring and fall. That's it. It doesn't boil. Don't argue with me. Argue with Stoptech in this white paper. Go straight to the brake fluid section:

http://www.stoptech.com/technical-su...leeding-brakes

sperkins

So if you bleed it after an event, you still have to bleed it before the next one?
Makes perfect sense.

froggy47

I think he misspoke,

I would leave it alone for a little street driving & then bleed/flush b4 event.

C5Natie

I was quoting directly from Motul. Thats why I was asking