Which brake fluid c63?

[Tommyc63amg]

Hi all, took my calipers off this morning as I'm having them painted, will need to top up the system when it comes to refit.

Now which brake fluid do I use??

Says dot 4+ on the cap

But when I went to the motor factors they looked in there book and tried to sell me 5.1. At that point I gave up and left it.

All I want to know is exactly which fluid to buy to top up.

Thanks

 

[flango]

I would have thought a 63 would use 5.1 but the fact it says 4+ on the cap would contradict this If you were driving a 63 as it's meant to be driven I would want 5.1 in there but if it's already filled with 4 then I wouldn't mix the 2 Sure one of the indies will advise shortly

 

[jaymanek]

5.1 is backwards compatible iirc so the car won't explode using it.

I would also recommend as it's a lot more heat resistant.

Would certainly recommend emptying the reservoir and fully flushing through the system using 5.1.

You will need to bleed the brakes in any case.

 

[Tommyc63amg]

What's the difference between dot 4 and dot 4+?

 

[wemorgan]

Brake fluid - Wikipedia, the free encyclopedia

 

[hotrodder]

What's the difference between dot 4 and dot 4+?

Min dry and wet boiling points, unless i missed it the wikipedia link didn't mention DOT 4+ which is the same basic flavour as dot 3, 4 and 5.1 but has min boiling points of 270°C dry and 180° wet, or at least that's what Wurth claim here... http://www.wurth.co.uk/data/productdocuments/070266.pdf
The internet suggests that DOT4+ has similar viscosity to DOT 4 unlike DOT 5.1 which is typically a lower viscosity brew although as they're all miscible* with each other...

* with the exception of the silly silicone based dot 5 stuff

 

[zenman63]

Just go to MB parts for the fluids as there cheap enough, inc oils and filters.