2004 Ranger - What part is this?

c_u_t_w

Hello there, I have a 04 Ranger xlt auto. and recently i have noticed a leak while parked (after driving) under the passenger side of the truck, the liquid looks like water and has no smell. The brake pedal (around the same time of the leak) has been somewhat stiff and the brakes come on harder with about 1/3 of the pressure it would normally take (brakes make a slight noise just before coming to a full stop) (Apologies as i don't know much about vehicle maintenance) but while i was looking for the source of that passenger side leak i noticed a hose had somi circled it in the screenshot) and when i shut the engine off after a couple minutes of letting it idle i can hear somewhat of a boiling sound somewhere around the circled portion in the posted screenshot but have no idea where its coming from. I would appreciate any helpful advice i can get. Thank you for your time.

Claires

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