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Engines with aggressive camshaft profiles can have insufficient manifold vacuum for power-assisted brakes
Mild street engines generally have 17-23 in.Hg...
Engines with aggressive camshaft profiles can have insufficient manifold vacuum for power-assisted brakes
Mild street engines generally have 17-23 in.Hg of vacuum, and power brakes require 16-17 in.Hg
Summit Racing street vacuum pumps plumb between the engine and brake booster, supplying 20-23 in.Hg of vacuum on demand for safe, reliable brake performance
Summit vacuum pumps are 12V diaphragm or rotary vane units, and many include hose, wiring, and installation hardware
High-lift, long-duration cams with tons of overlap are great. They help your engine make big horsepower and give you the loping, choppy...
Engines with aggressive camshaft profiles can have insufficient manifold vacuum for power-assisted brakes
Mild street engines generally have 17-23 in.Hg of vacuum, and power brakes require 16-17 in.Hg
Summit Racing street vacuum pumps plumb between the engine and brake booster, supplying 20-23 in.Hg of vacuum on demand for safe, reliable brake performance
Summit vacuum pumps are 12V diaphragm or rotary vane units, and many include hose, wiring, and installation hardware
High-lift, long-duration cams with tons of overlap are great. They help your engine make big horsepower and give you the loping, choppy idle that every gearhead loves. They do have a drawback, though, and it’s a big one: low manifold vacuum that can make power brakes dangerously ineffective. Fortunately, Summit Racing vacuum pumps are a simple solution to a serious problem.
The mildly tuned engine in a typical daily driver makes around 18-22 in.Hg of manifold vacuum at idle. This gets stored in the vacuum booster located behind the brake master cylinder, multiplying the force at the brake pedal when the brakes are applied, referred to as vacuum assist. During every brake application, vacuum is used and immediately replenished by the engine’s manifold vacuum. A minimum of 16-17 in.Hg of vacuum is necessary for proper power brake operation.
In the case of the high-performance vehicles we all love, an aggressive camshaft can easily reduce vacuum below what’s required for power brakes to function safely, sometimes into the single-digit range. A single-plane intake manifold can make the problem worse.
Summit’s vacuum pumps are plumbed into the vacuum line between the engine and the brake booster. That way, you get to use whatever the vacuum the engine makes, plus the vacuum created by the pump. Summit vacuum pumps make 20-23 in.Hg—exactly what your power brakes need! They’re also automatic, only running when vacuum is depleted. They require 12V DC, and are simple to wire in.
Summit Racing street vacuum pumps are available in both diaphragm and rotary vane styles, and many include hose, wiring kits, and mounting hardware.
A. A brake vacuum pump creates a vacuum supply for the brake booster. This allows power-assisted brakes to function properly.
A. If a brake vacuum pump fails, vacuum assist is reduced to whatever the engine can provide on its own (this amount varies by vehicle). The brake pedal will require more force for sufficient braking.
A. This could happen for a few reasons, and none of them are related to brake vacuum assist. Typically, when you don’t have enough vacuum, the pedal is hard; not soft. Reasons the pedal is going to the floor with a full reservoir include air in the brake hydraulics, a faulty master cylinder, or even drum brakes that are out of adjustment (this won’t generally cause the pedal to go to the floor, but it can cause excessive pedal travel). Badly rusted pad backing plates and rotors, and pads stuck in the carriers can also contribute to excessive pedal travel.
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Summit Racing™ 12 V electric vacuum pumps utilize a rotary vane style pump with an enlarged diaphragm to ensure maximum suction while remaining nearly dead-quiet and vibration-free. Utilizing a Manifold Absolute Vacuum/Pressure (MAVP) sensor eliminates the need for old-school vacuum switches and relays. This configuration also guarantees an incredibly quick vacuum recovery time, ensuring 17 in. to 23 in. Hg vacuum all the time. The pumps come in four standard configurations: Bare (no outer shell), Black, Chrome, or Gunmetal Gray ABS plastic outer shell. Each kit comes complete with 5 ft. of 3/8 in. supporting vacuum hose, proper wiring harnesses for an easy install, and vibration dampeners—all while maintaining a common mounting hole configuration.
( 270 )
$320.99
Maintain your brake vacuum level with one of these Summit Racing™ vacuum pump and reservoir kits. They're self-contained units that require no wiring of the relays or switches. Simply connect the positive/negative power—and the units will regulate the vacuum level itself. The vacuum pumps are designed to activate when vacuum drops below 15 in. and increase the brake vacuum level to 20 in. These pumps are made for vehicles using engine combinations that provide little or no manifold vacuum required for braking. They can be mounted in any position. The included vacuum reservoirs will allow you enough extra vacuum for stopping and to power any other accessories that require a vacuum source. They feature a built-in check valve and vacuum gauge, so you can monitor the vacuum level at any time. The reservoirs are manufactured from high-quality billet aluminum and have a built-in mounting flange for fast, simple installation.
( 11 )
$446.98
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