Residual Valve

Revision as of 08:04, 24 May 2011; view current revision
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The Residual Check Valve preloads the drum brakes with about 10 psi pressure. If you have front disk/rear drum, only the portion of the M/C for the drums has a residual valve. Disk brakes must not use a Residual Valve, but only need a weak pressure which naturally results from the M/C being mounted high on the firewall

Overview

• Datsun 1200 all-drum and disk-drum dual master cylinders are identical, except the latter only has one residual valve fitted.

• When converting from all-drums to disk-drums, the master cylinder to match should be swapped. Or you could use the all-drum cylinder, but remove the Residual Valve from the "F" portion.

• If relocating a disk-brake master cylinder below the floor a residual valve should be fitted.