Granatelli 12-Volt Electric Brake Vacuum Pump Kit - Bare Pump – 410100

GRANATELLI 12V VACUUM SUPPORT SYSTEM

ALL THE VACUUM SUPPORT — WITHOUT THE OUTER HOUSING.

The Granatelli 410100 12-Volt Electric Brake Vacuum Pump Kit is a 12V electric vacuum pump for power brake boosters, and it is the bare-pump version of Granatelli’s supplemental vacuum system, designed for vehicles that cannot consistently produce enough engine vacuum for dependable power brake assist.

Ideal for cammed vehicles, turbocharged and supercharged combinations, LS swaps, street rods and custom builds, the system automatically activates as vacuum drops and shuts itself off once the proper vacuum level is restored.

WHY CHOOSE 410100?

Same Vacuum Function — Simplified Bare-Pump Configuration

The 410100 eliminates the decorative outer housing found on the black, chrome and gunmetal versions. This makes it a strong choice for installations where the pump will be hidden, mounted in a tight location, or where appearance is less important than function.

THE PROBLEM IT SOLVES

Low Engine Vacuum Can Reduce Brake Booster Assist

Cammed engines, forced-induction systems and certain modified engine combinations can produce less or less-consistent manifold vacuum, especially at idle. The Granatelli electric vacuum pump supplies supplemental vacuum independently of engine manifold vacuum to support a properly functioning power brake booster.

Automatic Vacuum — Only When You Need It

IDEAL APPLICATIONS

Built for Vehicles That Don’t Produce Consistent Vacuum

● Cammed Vehicles    ● LS Swaps    ● Turbocharged Engines    ● Supercharged Engines    ● Street Rods    ● Custom Builds    ● Street / Race Applications

Key Features

UNDERSTANDING THE 17–23 inHg RANGE

If It Cannot Reach or Hold Vacuum, Check the Entire System

The 410100 is designed to operate within approximately 17–23 inHg of vacuum. In a properly sealed and functioning system, the pump should cycle as needed to build and maintain vacuum within this range.

If the system cannot reach or maintain the expected vacuum range, that does not automatically mean the pump is defective. A leaking brake booster, faulty check valve, vacuum leak, loose fitting, incorrect hose routing or another vehicle modification can prevent the system from building or holding vacuum. Inspect the complete system before diagnosing the pump itself.

SMART VACUUM CONTROL

MAVP Sensor Control

Granatelli’s MAVP — Manifold Absolute Vacuum/Pressure — sensor monitors vacuum and controls pump operation without relying on a traditional vacuum-switch-and-relay arrangement, helping simplify the electrical system while providing automatic vacuum control.

INSTALLATION PACKAGE

What's Included

Product Specifications

BARE PUMP OR HOUSED KIT?

410100 vs. 410101B: Which 12V Electric Vacuum Pump?

Both are Granatelli Motor Sports 12V electric brake booster vacuum pumps, and both product pages list a rotary-vane-style pump, MAVP sensor control with automatic on/off, an operating range of about 17–23 inHg, 3/8" synthetic reinforced hose with a 0.170" wall, and a fused EMI/RFI-protected harness. Both are made in the USA. The difference is the housing.

Want chrome instead? See the 410102C chrome kit, or compare every option in our 12V electric brake booster vacuum pumps collection.

EXTERNAL VACUUM SOURCE

An External Vacuum Pump for Street, Drag Race and Swap Builds

The 410100 is an external vacuum pump: the kit includes its own 12V pump, so your brake booster no longer has to depend on engine vacuum. That is why it shows up on big-cam street cars, boosted combinations, LS swaps and drag race cars where idle vacuum is low or uneven. With no outer housing, it is the easiest Granatelli version to tuck into a tight spot or mount out of sight.

New to vacuum pumps? Our Brake Vacuum Pump Guide covers how much vacuum a brake booster needs, how to test before you buy and how to install a pump so it lasts.

Installation Notes

● Mount the pump away from direct heat and road splash, using the included vibration-dampening bracket.

● Run the included 3/8" reinforced hose with short routing and no sharp bends, and clamp every connection.

● Use the fused harness, a solid ground and a switched ignition source.

● Verify with a vacuum gauge that the system reaches its range. If the pump runs constantly, see Why Is My Electric Brake Vacuum Pump Running Constantly?

● Full walkthrough: How to Install an Electric Brake Vacuum Pump: Step-by-Step Guide.

QUESTIONS WE HEAR

12V Electric Vacuum Pump for Power Brake Booster FAQ

What does a 12V electric vacuum pump do for a power brake booster?
It supplies vacuum to the booster independently of the engine. When a big cam, boost or an engine swap leaves too little vacuum for consistent brake assist, the 410100 makes up the difference and shuts off once vacuum is restored.

Does it need engine vacuum to work?
No. The kit includes its own 12V pump, so it does not rely on manifold vacuum.

What is the difference between the 410100 and 410101B?
Both list the same 12V rotary-vane-style pump, MAVP auto on/off control and roughly 17–23 inHg range. The 410100 is the bare pump with no outer housing. The 410101B adds an electroplated black ABS protective housing.

Does the pump run all the time?
No. The MAVP sensor switches it on when vacuum drops and off once vacuum is restored. If it runs constantly, check for a leak in the booster, check valve, hoses or fittings.

Where is it made, and how fast does it ship?
Made in the USA in Oxnard, California. Orders placed before 3:30 PM Pacific ship the same day, and shipping is free on orders over $100. 90-day warranty, with extended coverage available.

IMPORTANT VACUUM SYSTEM NOTE

The 410100 is designed to supplement a properly functioning vacuum system and operate within approximately 17–23 inHg. If the vehicle cannot reach or hold the expected vacuum level, inspect the brake booster, check valve, vacuum hoses, fittings, routing and vehicle modifications for leaks or excessive vacuum demand before assuming the pump has failed.