Blade brake dosen't work right away when switch is released. Takes a couple seconds of slow spin then the brake seems to stop the brake. Suggestions?

I can't find this saw at Makita; so, generally. Follow all safety precautions. :-)
If the saw is running rough, the first thing I'd check is the brushes for the motor, especially if it has any age. These are fairly inexpensive and will solve a lot of woes. The next thing would be to check the thumb switch, if it has one. This is the switch that allows you to pull the trigger to run the saw, if it's just a button, then check the actual trigger switch to make sure it's working properly as it probably, not always, also engages the brushes to reverse the motor for a second, to slow it down so it stops faster.

So, check the brushes on the motor, if they show any signs of wear, it's probably them. 2nd, check the switch. Please let me know and if I've helped, give me a vote up. Thanks.

A faulty switch if the blades are spinning at full cutting speed
Not cutting the current to the engaged blade clutch so the blades are stil on even when the switch is in the off position.
The blade brakes not gripping the pulleys fully to stop blades so anything brushing against the blade will start them spinning
Or the clutch medium is damaged and is not releasing the blades fully so they spin but slowly when you switch the switch they just slow down get the deck alignment switch for clutch and the wireing to the blades system checked and the braking system for the blades pulleys checked as soon as possible the machine is dangerous
With the blade continuously rotating you risk injury from the blades catching.g you or someone else who's not aware the blades don't stop.etcetera.

the brake engages the clutch and no it does not stop right away.

The brake mechanism works when tension is released from the idler / cable. The brake is spring loaded to contact the spindle this stops the blades from spinning. I have attached a drawing showing the brake arm and where it can be found on the deck.

On the top of the mower deck, there is a spring that will pull to disengage the blade idler pulley. At the same time, it will release two springloaded arms with brakes that press on the pulleys at the top of the blade spindles. On top of the mower deck at the back, the two spring loaded arms may be held out of the braking position by a cam. Make sure the cam is free to allow the blade brakes to activate when you disengage the blades. If arms are out of alignment, or the parts are too worn, the blade brakes won't move and the blades keep spinning, even after you have disengaged and the safety switch is deactivated. This is a dangerous situation and should be fixed soon. Good luck.

you need to check the safety switches bypass them one at a time to find the bad one

The brake on these saws is a controlled by the switch; it allows power to only one side of the field when you release the switch thus pulling the motor to a stop. In order to get your brake working again you have to replace the switch with Makita part number 651923-1, Switch TG70B. You can put in a generic switch that fits but the blade will spin slowly to a stop every time you release the switch, which you may have now.

I don't know the make or model of your saw but the blade brake on circular saws is controlled by the power switch. If your saw previously did brake the blade rotation, you need a new switch to make it work again. Also a generic switch will not do, you have to have the brake switch made for your saw or it will do the same thing.

if it is only 2 months old take it back and get another one. if this not an option try some loctite on bolt

Most washers use a lid switch that closes the contacts when the lid is closed, look for a "probe" on the lid that pushes a "pad" that closes the switch, it's possible the switch pad or linkage is bent causing erratic contact closing, any way that is the first place to start. THIS IS A SAFETY DEVICE, DO NOT BI-PASS IT. Good Luck