We addressed a surprisingly long pedal from boiling the brake fluid during spirited driving with stainless steel brake lines from Stoptech and new Castrol SRF fluid.
Now that the steering issues were addressed in Part 3, we could once again start driving the car spiritedly in the canyons; but as an old car is pushed harder, the next weakest link often raises its ugly head. This happened to be the brake fluid.
I have never experienced boiled brake fluid so easily from such little use of the brakes. On a racetrack, this car would not even make it one lap driving at 10/10ths from how quickly the pedal went to the floor on the street. I can’t stress enough that proper maintenance is very important on older performance cars. Far too often does flushing the brakes with fresh fluid go overlooked. While the car had new, reasonably performance-oriented brake pads installed, the shop that serviced this car completely ignored the importance of flushing the brake fluid; which is likely the original 30-year-old fluid!
Rubber brake lines flex and degrade over time. Upgrading to stainless steel brake lines is a must for any performance car, and especially older performance cars. We installed this set of StopTech stainless steel brake lines to improve the brake pedal feel and as a preventative safety measure for this FD RX7.
We started with the front brakes. Replacing brake lines is quite easy on the RX-7. Spraying the bolts with penetrating oil a few minutes before cracking them loose is a good idea. Once loose, the silver retaining clip is pulled out and the chassis-side line is easily removed.
The same goes for the caliper-side fitting. The FD has a hard line that connects the caliper to the attachment flange on the suspension upright.
The new StopTech stainless steel brake line (below) will greatly improve pedal feel and reduce brake pedal travel by not expanding as much as the old, original rubber brake line (above). Stainless steel lines are a must for all performance cars, and a major safety item for older cars.
The stainless steel brake line easily installs back on the car. Reinstall the retaining clip, then screw the bolt back into the new hard line and tighten it down.