Brake Vacuum Kit
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A complete 12 volt vacuum kit that restores brake servo assistance after the engine comes out. Pump, reservoir, vacuum switch, relay, hose and fittings, all in one box.
Almost every petrol car takes the vacuum for its brake servo from the inlet manifold. Remove the engine and that vacuum goes with it. The servo does not fail safe into something harmless: the pedal simply goes hard, and the car needs a great deal more pedal force to stop than the driver expects. Replacing that vacuum supply is not an optional refinement on a conversion, it is part of making the brakes work.
Why there is a reservoir, and why it matters. A pump on its own has to start every time the servo takes a breath, which means it runs on almost every brake application. That is noisy, and it wears the pump out. The reservoir stores vacuum between applications, so the pump runs in occasional short bursts to top it up instead of cycling constantly. The vacuum switch is what makes that work: it watches the stored vacuum and starts the pump only when it drops below the set point.
It also buys you braking with the pump stopped. A charged reservoir holds enough vacuum for several assisted stops on its own, so a blown fuse or a failed pump does not take your servo assistance away in the same instant.
Key specifications
| Manufacturer part | BRAKEVACKIT |
|---|---|
| Type | Complete electric brake vacuum kit |
| Supply voltage | 12 V DC |
| Pump control | Automatic, by vacuum switch through the supplied relay |
| Relay | 12 V, 15 A, with holder |
| Hose and fittings | 10 mm barb, 1/4 BSPP junction block |
| Non return valve | 10 mm, one way |
| Kit weight | 1.7 kg |
Features
- Everything needed in one kit, so there is no sourcing a pump here and a switch there and hoping they suit each other
- Reservoir cuts pump duty cycle, which cuts noise and extends pump life
- Automatic switching, so the driver never has to think about it
- One way valve holds the stored vacuum when the pump is off
- Relay and holder included, so the switch never carries pump current
- Installation PDF supplied, with the wiring laid out
Compatibility
Suits any conversion keeping a conventional vacuum brake servo, which is most petrol and diesel cars converted to electric drive. If your car has a servo with a hose to the inlet manifold, this kit replaces that supply.
It is not for vehicles with a hydraulic brake booster, an electrically boosted brake system, or no servo at all.
Crimp terminals are not included. The parts list calls for them and you will need to supply your own to suit your loom.
Mount the pump on rubber isolators away from the cabin bulkhead. It is the noise path, not the pump itself, that people notice.
In the box
- 1 x 12 V vacuum pump
- 1 x vacuum reservoir
- 1 x vacuum pressure sensor, 1/4 BSPP
- 1 x junction block, 1/4 BSPP
- 3 x 10 mm barb fitting
- 1 x 10 mm one way valve
- 1 x 12 V 15 A relay with holder
- Vacuum hose
Downloads
The installation PDF is in the Documents tab and covers the plumbing and the wiring. Read it before you cut any hose.
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