[peteyg]

Getting my calipers refurbed installing braided hoses and so will need to replace the fluid. Is it DOT4 or DOT5 for the 147GTA?

Thanks,

Pete

 

[Oggy_GTA]

It's Dot 4 as std. Dot 5.1 generally has a higher boiling point.
Dot 5.0 should be avoided as it's silicone based an incompatible with what's been used from the factory.

 

[peteyg]

Thanks! Used to dealing with classic cars and never quite know when to use the 5.1 as I know it's not friendly to older materials.

Pete

 

[David C]

Yep NEVER use DOT5.0

A "Class 6 DOT4" is really what most people should be using now. Lower viscosity to work better with ABS/ESP/etc and is backward compatible to normal DOT4

I think the minimum boiling point of DOT5.1 is higher than the minimum of DOT4 but most performance fluids with high boiling points are DOT4

 

[cannotstop]

It does not matter much if you are using DOT 4 or DOT 5.1.
What matters more is what type of DOT 4 it is.

The standard boiling temperature of DOT 4 is:
DOT 4 base
dry: 205
wet: 155

And a few of the racing ones are below.
As you can see its more about which brand / type you chose. I alway like the Castrol SRF, but its bloody expensive, at 45 pounds a bottle. Though it lasts a year or more on the track with no problem, (so pay once rather than two three times)

ATE Super blue
dry: 280
wet: 202

Brembo LCF 600+
dry: 316
wet: 203

Motul RBF 600
dry: 311
wet: 216

Endless RF-650
dry: 328
wet: 218

Castrol SRF
dry: 310
wet: 270

CL Racing Brake fluid
dry: 325
wet: 195

Ferodo Superformula
dry: 330
wet:

AP racing Radi-Cal R4
dry: 340
wet: 204

AP racing Radi-Cal R3
dry: 325
wet:

AP racing Radi-Cal R2
dry: 312
wet:

AP Racing AP600
wet: 320
dry: 199

Performance Friction RH665
dry: 325

 

[alexgee]

Is 1ltr sufficient for a change as outlined by OP?