Chase Bays Clutch Master Cylinder Adapter - Nissan 240sx S13 / S14 / S15


Chase Bays


Ships Direct from Manufacturer


This product is designed for those who need or want to use a Wilwood 3/4 aka 0.75" Bore Clutch Master Cylinder on their S chassis without cutting or drilling their firewall. Some transmission swaps require a larger bore clutch master cylinder and since there isn't a larger Nissan one you can swap in this is the best method. Additionally, this product is better aesthetically and matches our Brake Booster Eliminator if you have it. 

You can get it with either its own reservoir or a clutch feed adapter hose to share fluid with the brake reservoir. For those who have or plan on getting our Brake Booster Eliminator; we have an add on for this product that further simplifies and improves aesthetics. The installed photo shows the clutch master cylinder sharing the brake reservoir for fluid. This is done stock on most BMW and Mazda chassis so we wanted to integrate this idea to the S13, S14, and S15 world. If you select the option to add the "Clutch Feed Adapter" it will include the -6AN hose and fittings to adapt the Brake Reservoir. This will attach to the Clutch Master Cylinder with Wilwood's supplied hose adapter. For further understanding, this is pictured on assembled and installed photos.

The plate is made of 0.125" (1/8 or 3.17mm) steel and has the master cylinder mounting studs pressed and welded in. The 240sx / Silvia clutch pedal has studs on it that go thru the firewall, the open holes on the plate are what attach to those studs in the engine bay. Make sure you tighten the plate to the master cylinder before installing it onto the car. The upper nut for the Wilwood Master Cylinder isn't accessible once installed based on the proximity of the firewall lip (see installed photos). 

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

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Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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