1990 Mercedes-Benz 300TE 4MATIC Q&A

1990 Mercedes-Benz 300TE 4MATIC Question: problem with breaking

when I press the break it goes sponggie when stopping and when I pump the break it goes back to "normal".This is happening every now and again. Any suggestions? thanks -
Answer 1
Have checked at qualified shop asap. You could have master cylinder getting ready to go completely out or air in system. -