I have bmw 318I the oil indicator for motor appear when use break

have you tried having the fault codes reading section of the book
It is the first line of the trouble shooting
it appears that there is an electronic part break down for over heating
it could be in the ignition control module, ECM, coil/s, immobilizer
try exchanging the ECM with a known good one and fix any faults shown on the code scanner

Yes. It's called the "rear main" (crank) seal. To repalce it requires the temporary removal of the transmsission. It could also be from leaky valve cover gaskets, a front main (crank) seal or from a number of other sources. Even a leaky oil drain plug seal.

Go to the link BMW E36 How to Reset Oil Inspection Indicator

Please refer to the owners manual for red light warning, it can be low oil pressure or hot engine or emissions system. If you don't have an owqners manual you can find used ones on eBay Motors.

This is major in a bmw definitely blown head gasket possibly cracked head as well. Repairs will be pricey.

Switch on ignition.

Earth terminal 7 (I've no pic sorry) and hold for 3 seconds.
Switch ignition off
That should do it

change the oil pressure sending unit on the engine.

now when you put the brake on you are drawing power from the fuse board to feed the stop lights,so either you have a power supply problem of some description or the brake pedal mechanism has pulled some cables.But you could also have a ECU problem where when you apply the brakes its throwing up the oil light which could be caused by a bad earth.Sorry but this is one of them problems where a BMW dealer mechanic would obviously have come across this before and would be able to sort it out in minutes.But the problem their is that a lot of garages have unscrupulous reception clerks that like to write a bill out to milk the customer..

low oil or a worn oil pump...have the oil pressure checked at once.
If it's low, it's time for a replacement car or motor.

u need new calpers or padds