lafreniere123 Posted February 8, 2015 Share Posted February 8, 2015 Hi guys, A local guy is selling his 180sx 1991 brake booster with master cylinder. I was wondering if someone ever tried to fit one of these on their 240z. Would it be a nice upgrade or should I look elseway? I am now all stock but sometime I will be upgrading to rear disk brake and better front ones. Thanks guys. This is the exact picture of the brake booster... Quote Link to comment Share on other sites More sharing options...
Miles Posted February 8, 2015 Share Posted February 8, 2015 That master cylinder is a "fast fill" or "step bore" master cylinder designed to work with "low drag" brake calipers. Fast fill calipers have a seal that withdraws the piston further back in the caliper bore so the pads do not ride on the rotor hence they are "low drag". That bulge on the side of the master cylinder contains valving to work with the step bore piston which provides an extra volume of fluid at the beginning of the stroke to make the low drag caliper piston move out of its resting position to push the pads into contact with the rotor. After the initial push of fluid, the master cylinder works like any other master cylinder. If you have a car that doesn't have "low drag" calipers and you install a fast fill master cylinder you would experience a higher, but stiffer, pedal. However, if you have installed disk brakes and a larger master cylinder and still have a long pedal this might be a solution to reduce pedal travel. I haven't seen anyone try this. Quote Link to comment Share on other sites More sharing options...
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