What is the correct sequence for bleeding brake lines on most front-wheel drive vehicles?

The correct sequence for bleeding brake lines on most front-wheel drive vehicles is designed to ensure that air is effectively purged from the braking system. The typical sequence starts with the furthest brake line from the master cylinder and progresses towards the closest one.

In this case, the sequence of RR (rear right), LR (rear left), RF (front right), and LF (front left) works effectively because it starts with the rear brakes, where any trapped air tends to linger the longest due to their distance from the master cylinder, and moves towards the front brakes. This method minimizes the chance of residual air pockets being trapped in the system, which can lead to spongy brakes or reduced braking efficiency. By following this sequence, a technician can ensure that the brake fluid circulates properly, flushing out air and maintaining the integrity of the braking system.

Understanding this sequence is crucial for any mechanic to maintain optimal brake performance and safety in vehicles, especially in the context of front-wheel drive configurations where the design may affect how air escapes from the system.