blkc6z51

When buying brake fluid what is more important the dry boiling point
or the wet boiling point or both.

pit-pony

If the wet is high so is the dry, go for the highest wet you can find.

..jack

redvetracr

I believe that would be Castrol SRF...probably a little overkill for an HPDE car and probably a lot expensive..........for what it`s worth I use it.
...redvetracr

Last C5

ATE Blue or Yellow are a good compromise between cost and as high a wet boiling point as you can get. About right for a HPDE Car.

AU N EGL

ALways use the WET boiling point numbers. Brake fluid gets saturated very quickly.

Brand Wet Boiling Point Dry Boiling Point
Castrol SRF 518°F 590°F
Motul RBF600 420°F 593°F
AP-600 410°F 572°F
ATE-Super Blue 392°F 536°F
Valvoline 333°F 513°F
Castrol LMA 311°F 446°F
Ford HD 290°F 550°F
Wilwood 570 284°F 570°F
PFC-Z rated 284°F 550°F
AP-550 284°F 550°F

pit-pony

Why does GM specify DOT3 when DOT4 is so much better (funny they use DOT4 in the clutch)?

..jack

Lancer033

DOT 3 & 4 are compatible, but since there's no need for the better/more expensive fluid in a street car, so they spec DOT 3

AU N EGL

I was just at the corvette plant in BG early this week. The amount of brake fluid that is used ( 15 corvettes per hour produced ) that it would not be fesable to put DOT 4 in a few corvettes.

Plus the differnt part number and supplier of a differnt fluid would not make it possible. Just change to DOT4

wtknght1

I experimented at Sebring this year - between Motul 600 and Castrol SRF. I noticed no difference in performance. The only difference I noticed was that the Castrol had fewer bubbles when I'd crack open the bleed screw. Normally with the Motul, I'd see a bubble or two. I rarely saw any with the Castrol. Castrol is more expensive, but you get a larger container and it's supposed to last longer (due to a higher wet boiling temp)...so it may be a wash in the end.

blkc6z51

Thanks all for that info

ReddyZ06

Tom,
Thanks, very good comparison data.
FWIW, The last time I bought Ford HD they dropped the DBP to 500 from the old 550 number. I forget the wet #'s right now.
Mike

J Ritt

Read this please!

http://www.stoptech.com/tech_info/wp...fluid_1a.shtml

John Shiels

yep as stated above price it by the volume not the container and SRF looks better although more would you go for a bargin transfusion? Add the fact it last longer and you bleed it less it probably cost less than Motul. Never had much luck with Motul 600 turns black and fades under hard conditions. I put 1000 track miles on SRF without a bleed. Smart no but it last way longer than anything else Motul won't make more than a day at best.

ReddyZ06

Thanks, great information.
Mike

pit-pony

Still wonder why GM puts DOT3 at the factory and not a good 4.

What does GM use in other cars?

I always used a good DOT4 but I will consider a 5.1 now, wonder how that will do in the Vette?

..jack

pit-pony

Mercedes Benz dealers sell a DOT4 Plus brake fluid in a metal can (A 000 989 08 07 17)for a very reasonable price which rates at 500 dry and 356 wet that performed very well for me.

..jack

John Shiels

356 wet is low

wtknght1

1. Cost.

2. Dot 3 as well.

3. Dot 5.1 works very well in the vettes...it's just got a better boiling point than DOT4. The Motul 600 is a very good fluid. I used it for years with no issues! I've just recently switched over to Castrol SRF, because I think it may be a better value in the long run.

Bink

Where do you guys buy Castrol SRF??

pit-pony

DOT standards

DOT3 401 dry/284 wet
DOT4 446 dry/311 wet
DOT5 509 dry/356 wet

So I think the Mercedes DOT4 Plus is realy a DOT 5.1 product and is very nice (specially for the price, about $30 a can)

..jack