Russian Deputy Foreign Minister Gennady Gatilov and US Under Secretary of State Wendy Sherman "promised that they will help both here and in their capitals ... To unblock the situation for us," Brahimi told reporters following a meeting with the two diplomats.
That meeting came after Syria's warring sides spent days in Geneva trading blame for the violence ravaging their country and endlessly restating their positions.
"Until now, we are not making much progress in the process," Brahimi said, acknowledging that "failure is always staring at us in the face."
The talks that began on January 22 were initiated by Washington, which backs the opposition, and Moscow, a key ally of Syria.
Asked whether there had been any change in the attitudes of the two sides since then, Brahimi said the delegations "are a little bit more familiar with the presence of the other side."
"I don't think any friendships have developed yet," he added. "We're still looking for the point where we can see the light at the end of the tunnel.