Vankey Electric Vacuum Pump Switch & Relay Kit - 28146 Normally Open Pressure Switch for Brake Booster, Auto Relay Included

Vankey 28146 Electric Vacuum Pump Switch & Relay Kit is a ready-to-install replacement set that automatically controls your electric vacuum pump to maintain brake booster vacuum.

This kit pairs the 28146 vacuum pressure switch with a matching 28146 relay to give reliable on/off control of electric vacuum pumps used with brake boosters and other vacuum systems. The pressure switch senses vacuum level and actuates the relay, so the pump runs only when needed. The bundle is built for under-hood conditions and includes a clear wiring guide for straightforward installation.

How does the kit keep my brake booster supplied with vacuum?

The pressure switch monitors the vacuum level and closes its contact when vacuum drops below its set point, typically around 18–22 inHg. That closure energizes the relay which delivers current to the pump; once the vacuum recovers the switch opens and the pump stops.

• Pre-set activation range around 18–22 inHg for consistent switching
• Relay handles high pump current to protect wiring and switches
• Automatic cycling prevents continuous pump operation

What protection does the 28146 relay provide?

The included relay takes the heavy electrical load of the pump so the vacuum switch and vehicle circuits are not exposed to high current. This reduces heat and wear on wiring, protects the ignition circuit, and increases the longevity of the switch itself.

• High-current relay contacts rated for typical electric vacuum pumps
• Separates control circuit from pump power to reduce voltage drop
• Clear terminal layout simplifies safe connections

Is installation difficult and what wiring is required?

Installation is intentionally simple: mount the switch and relay in suitable locations, route the vacuum line to the switch port, and connect four main wires—12V positive, ground, pump positive, and the switch control lead. The kit includes a wiring diagram so you can match terminals quickly.

• Mount switch to vacuum line and secure relay in engine bay
• Connect relay to battery positive, ground, pump, and switch terminal
• Follow supplied diagram to avoid mis-wiring and ensure proper fuse protection

What durability should I expect from these components?

Both the switch and relay are manufactured for under-hood environments and built to resist vibration and heat typical of automotive use. Corrosion-resistant terminals and robust housings help deliver stable performance over many cycles.

• Rugged housing designed for engine-bay temperature and vibration
• Sealed electrical contacts to reduce corrosion risk
• Quality relay contacts to withstand repeated switching loads

Who is this for: The Vankey 28146 kit is aimed at DIY mechanics, fleet technicians, and vehicle owners who use aftermarket or replacement electric vacuum pumps for brake boosters, HVAC actuators, or auxiliary vacuum systems. It's ideal when you need a matching switch-and-relay pair to restore automatic pump control, protect vehicle wiring, and reduce pump runtime without complex rewiring or custom electronics.