Brake Issue after replacing spark plugs

I have always changed my spark plugs and never had any issues. I just finished changing the spark plugs for the first time on my 05 Tacoma, 4l - v6. After changing them, the engine runs fine but there a small whistle sound on the driver side of the engine and my brakes are very stiff to the point of almost having no brakes. HELP! Anyone ever experienced this. I'm just starting my Google research but figured TW is a great place to begin.

 

vacuum hose to the brake booster...

 

This OP, make sure the hose is still connected and or the one way valve is not damaged.

 

Alright i'll go double check everything. Thanks for the quick replies buds

 

Let us know what you find.......

 

Probably split the hose or a crack (whistling noise)...

 

Thanks for the replies. Ended up not securing the vacuum hose from the brake booster like mentioned first, it was loose on the intake valve it connects too. And it was just barely loose, which goes to show the impact it has. I double checked all other hoses, clamps and what not. Started the engine, brakes became a bit soft and normal functioning after a few revvs. Its sounding great and running perfect for 103k miles.