bleeding brakes.....dot 2. dot 4??

[S17EW O]

I am soon going to be doing discs and pads all round on my lcr 225....what break fluid can I use....I have access to some good quality dot 4, could I use this?

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ovni with forge 007, Jetex cone filter + cold air feed, N249 bypass, 8.5j satin black RS6 reps and much more to come!

 

[Fl@pper]

always thought it was minimum dot 4 as standard

doesn't it say on the cap ?

 

[S17EW O]

I aint got a clue.....been told most cars are dot 2....doesn't say anything on the bottle. As its not supplied to the public. Its just put in a plain bottle....its h542 0x8

 

[james walker]

the handy search button revealed this in 0.998ms

http://www.seatcupra.net/forums/showthread.php?t=176910

 

[GlanzaV]

DOT 4 as stadard - I mentioned this in a thread not so long ago (wonder why it never came up in the search?)

I noticed that a good DOT 4 (Motul) had better wet/dry boiling points than Halfords DOT 5.1 so don't always just assume higher DOT rating=better fluid.

 

[Fl@pper]

i think it went up in scale dot 2/3/4 mineral then 5 was silicone and then back to mineral with 5.1 always runs me in circles

as you said the water soaking and boiling point spec of the specific is most useful

 

[S17EW O]

So this dot4 will be good enough stuff then....next question is its obviously going to be a different quality to what's in it now. Should I drain the lot and refil it with new? Where's the best place to drain it from?

 

[Phillc]

So this dot4 will be good enough stuff then....next question is its obviously going to be a different quality to what's in it now. Should I drain the lot and refil it with new? Where's the best place to drain it from?

Have a search mate there is loads on this subject, and no you should not drain all the fluid out, in fact thats the last thing you should do.

 

[GlanzaV]

As said lot's of info. but quick tips, get a pressure bleeder, and work in from the furthest caliper from the MC, making sure to keep the resevoir topped up at all times!

Also quick info about wet/dry boiling points:

All brake fluid is hygroscopic so will absorb water over time meaning the boiling point will change (can't remember what %'age water content the wet boiling point is quoted at off hand!) -- For people changing their brake fluid regularly (like race/track cars) a higher dry boiling point will be more beneficial because you'll change the fluid before it takes on too much moisture. In real life though, you'll want one that has a better wet boiling point.

Basically read the back of the label, it'll help you choose between fluids.

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P.S. That info is more for folk using the search facility - I know you have some sitting about! Just hope it hasn't been opened?

 

[vwbassett]

Im quite happy with halfords 5.1 as with trade discount its silly cheap so I can change it nice and regulary which is perfect for the cars intended use. It is not the best as stated above you can get better dot4 or super dot4 fluids. Only thing is 5.1 fluids in general must meet a minimum standard which is quite high where as dot 4 can be practically anything so cheap brands should be avoided. Id go for something like the motul or the castrol super dot4 and you wont have a problem.

 

[godber225r]

Gunson eezibleed and alot of patience and socket extensions!!!!! a relitively easy job to do and take the charge pipe off it so much easier for access. and dont forget the clutch!