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The standard handbrake kit by Hollin Applications allows the user to either apply or remove a vehicles handbrake with a force of up to 800N (80kg) by the push of a button, with built in safety features to ensure no accidental applications or removals of the handbrake occurs. This circuit designed by Hollin Applications uses an input signal to switch the direction of a 4 inch LA1 Linear Actuator (different stroke LA1 units are available, we've found that this one is the best fit for most vehicles). The double pole switch changes relays in a H-Bridge configuration which changes the direction of current flow and shorts the D.C. Motor when switched off. This ensures a minimal amount of overrun on the Actuator. This circuit automatically converts the low power input signal to the high current motor drive.