Morris Minor Owners Club

What oil can i use for the brake cylinder top up? located under the driver's carpet.

DOT3 or DOT4 Brake Fluid

alright. thanks again lolx...

Let the botle of fluid stand with the cap loose, but the spout covered to keep out dirt, for a while before pouring it slowly into the master cylinder (a clean funnel is useful here).
This allows any air bubbles produced in carriage to disperse. Once I've topped up, I again wait with the top loose on the master cylinder before using the car.
And don't forget, folks.....brake fluid degrades over time. It gets contaminated, and can eventually contain an amount of water. An annual change maintains its effectiveness.

if i am not sure what the mechanic before has used which is either a DOT3 or DOT4. will it be alright if it is mixed when i i use a different type from before?

wouldnt the brake fluid when in contact with atmosphere absorbs the water vapor which contaminates it?

need to do bleeding of brake when mine has front disc conversion?

DOT 3

Make sure that a previous owner hasn't put silicone fluid in - it's usually purple, and doesn't act as paint stripper. Conventional DOT3&4 should not be mixed with Silicone. There are plenty of other threads on the argument of whether to use silicone fluid in a Minor!