Protein Needs. Eating almonds in addition to other high-protein foods can help you meet your protein needs. The Institute of Medicine recommends men consume at least 56 grams, women eat 46 grams and pregnant and nursing women consume at least 71 grams of protein each day.
Caustic material is some form of substance that has the ability to  destroy or eat away at living tissue. Certain bacteria, such as  MRSA, are considered caustic materials.
The term caustic can also mean corrosive.. This type of brake fluid can be corrosive to some paints, chromes, and plastics. It also can cause irritation when exposed to skin, and is toxic if ingested. I suspect this is why brake fluid is labeled as caustic. Regarding your question about pH: it doesn't apply. pH is a measure of the H+ ions in an aqueous (water) solution. The lower the pH, the greater the content of H+ ions in the water, and the more acidic it is.