Both the Haynes and Porter manuals for the Tipo / Tempra can be found on-line as pdf files, although they are quite large downloads (about 50Mb).
There is a load sharing valve under the back (over the top of the rear axle) to the left of the tank looking at the back of the car. The brake piping into the valve and also from the rear wheels does suffer badly on some cars from rot / rust. I have had this happen twice. Check all the pipes while your at it.
I have found its easier to get a garage to do it, they usually replace with copper. It an awkward and messy job especially if the pipes / joints are badly corroded. I've just had our 1.9TDs done in exactly the same place, rear offside pipe from the load valve to the junction with the rubber pipe from the wheel. The fuel tank has to come out to get at this pipe.