Caching consistency is an important issue for cooperative caching in mobile environments but has not been adequately addressed for mobile ad hoc networks (MANETs). In this paper, we proposed a novel approach, called RPCC (Relay Peer-based Caching Consistency), to addressing the caching consistency issues in a MANET. With the help of relay peers between the source host and cache hosts, both push-based and pull-based strategies can be employed, which helps to reduce the communication overhead and query latency. The source host pushes the data to relay peers and cache hosts pull the data from relay peers. These operations can be performed asynchronously and simultaneously. Moreover, the proposed RPCC approach is flexible in that it can deal with different consistency requirements adaptively. Simulation results demonstrated that RPCC outperforms the traditional push and pull based strategies by taking their advantages while at the same time avoiding their weakness.