340BHP-WRX

iTrader: (6)

As title,fitting 4 pot calipers,new discs,carbone lorraine pads and goodridge braided hoses to my Classic.

Which brake fluid would be the best for me ?

Also,when removing my old brake hoses is there a way to remove them without losing all my fluid as I understand it will be harder to bleed them afterwards if that happens ?

172sport

iTrader: (6)

I use std dot 4 fluid, no hint of fade even around Cadwell Park.....

172sport

iTrader: (6)

Oh, no probs bleeding when changing the lines.

Only problem i did have was the original lines were seized solid onto the cars hard lines. A small amount of heat from a plumbers blow torch and they come off easily, that way you dont damage the union nut and cause yourself greif having to make the end off again.

rickya

iTrader: (18)

Motul RB -

ozzreid1964

iTrader: (32)

fitted goodridge braided hoses and dot 5 brake fluid

MCS_5435

In reference to the use of DOT 5 fluids, please be aware of the following:

The standard fluid used in most cars is DOT4, and this is what the Scooby workshop manual recommends (at least it does in my MY03 WRX)

There are some incompatibilities in the DOT rating on brake fluids. DOT 3, 4 and 5.1 are glycol based and are all compatible, but DOT 5 is a silicone based fluid and can't be mixed with the others. To quote from a Millers article:-

Note the two types of fluid are not compatible and must not be mixed in a braking system.
Silicone Brake Fluid (DOT 5)
Silicone based DOT 5 was originally introduced to give higher temperature performance over glycol DOT 4. Silicone fluid also has other advantages, it does not damage paintwork and it does not absorb water. However, silicone fluid is a poor lubricant and does not lubricate ABS pumps as well as PAG fluids. It is also more compressible than PAG fluids, which can result in a sluggish or spongy pedal. It therefore requires special design considerations in baking systems. Further, because it does not absorb water, any water remains as globules, which can pool in low spots in the system and cause corrosion. This water can vaporise when heated under heavy braking giving a disastrous effect on braking efficiency.
DOT5 fluids are not recommended for motor sport applications.

Maybe Ian from Godspeed or Bren from Apex would comment from their experience points of view.

rbaz

iTrader: (1)

This is what AP’s website says

SILICONE BRAKE FLUIDS – A WORD OF CAUTION
AP RACING NEITHER MARKETS SUCH FLUIDS NOR RECOMMENDS THEIR USE WITH OUR OWN OR ANY OTHER BRAKING SYSTEM
Virtually all of the problems with Silicone Brake Fluids relate to:-
Long/spongy pedal
Sudden loss of brakes
Hanging on of brakes
They reflect certain properties of silicone fluids identified by us over many years and recently ratified in SAE publications, namely:-
High ambient viscosity
High air absorption
High compressibility
Low lubricity
Immiscibility with water
Research has shown that the relationships between problems reported and properties identified may be expressed as follows:-
Long /Spongy Pedal

I would use DOT 5.1 and check its not silicone based.

340BHP-WRX

iTrader: (6)

I'll get some Dot 5.1 then

340BHP-WRX

iTrader: (6)

I've been told that Motul RBF600 is the best fluid to use.

Anyone know the best and quickest place to get this from ?

I've seen it advertised between £8-£20 for 500ml

stockcar

rbf600 is a high spec fluid, track/race type use and will cope with higher temps no problem - it may well be the "best" depending on what your using the car for, or you may find the slightly lower spec Motul dot5.1 is more suited to your use & budget???

alyn

rickya

iTrader: (18)

I used to get mine from either Big Phil at East Shore Racing or Opie Oils. Approx £8 IIRC