How much fluid do I need to buy to do a complete flush of my braking system?

This will vary with each vehicle, but usually you will need 1 litre of fluid to do a flush and refill of your system.

How often should I bleed my brakes?

If you use your car in competition, you should bleed the brake system regularly. The brake fluid in the caliper itself should always be fresh so quick ‘bleeds’ before race weekends and between races is always a good idea.

Can I use Circo MF1200+ in my Clutch System?

Yes, the Circo MF1200+ can be used in hydraulic clutch systems unless a Silicone base fluid is required.

My vehicle handbook says use a DOT 3 brake fluid – can I use a higher specification DOT 4 fluid?

DOT 4 and DOT 3 fluids are compatible so technically there is no reason why you shouldn’t. The Circo MF1200+ meets and exceeds DOT 3 standards. We do however always recommend that customers follow the Vehicle Manufacturer’s recommendations when adding brake fluid.

My vehicle handbook says to use synthetic brake fluid. Is this brake fluid synthetic?

Yes, DOT 3, DOT 4 and DOT 5.1 fluids are all synthetic.

Can brake fluids be mixed?

We do not recommend mixing fluids as the performance will be limited by the lowest performance fluid in the system. However, if you need to do an emergency top up, brake fluids conforming to DOT 3, Dot 4 and DOT 5.1 can be mixed.

Note: Silicone (DOT 5) and mineral-based brake fluids should never be mixed with any other types.

What do the terms Wet and Dry boiling point mean?

For performance and race users who frequently bleed their brakes, the dry boiling point is the one to take note of.

Wet boiling point is the term given of how quickly the boiling point of a brake fluid will decline and is measured after being exposed to humidity (moisture) for a specific period of time. The wet boiling point is more important for OE applications where little attention is paid to the brake system once the car leaves the dealership outside of general service.

Dry boiling point testing is done when the fluid is new. This is more important for motorsport applications as racers bleed their brakes more frequently which is why the wet boiling point is not as applicable.