Install the fender covers to protect the paint finish. Clean any dirt or grime off the master cylinder reservoir cap with the ...

On certain sport utility vehicles, the reservoir filler cap of the brake master cylinder may induce a vacuum, introducing some air into the brake master cylinder reservoir. This could cause ...

but like brake calipers, sometimes it can spring leaks or otherwise fail, and it must be rebuilt or replaced. The master cylinder is topped by the brake-fluid reservoir, which must be kept full.