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Frequently Asked Questions
Need answers before you order? Start here. If your setup is unusual, tell us about your build and we will help confirm the right configuration.
My car does not make enough vacuum. Will an iBooster work?
Yes. The Bosch iBooster is vacuum-independent. Brake assist is provided by an electric motor and a three-stage gear unit, so big cams and low manifold vacuum are not a concern.
What happens if I lose electrical power?
The pedal remains mechanically connected to the master cylinder through a pushrod. If the electrical circuit is interrupted, the system operates as manual brakes, similar to a vacuum booster after assist is lost.
How difficult is an iBooster to install?
If you are comfortable replacing a conventional brake booster, the mechanical work is familiar. The electrical connection uses constant power, switched power, and ground. Complete kits include the harness, brackets, hardware, and related installation components.
What is the difference between Gen 1 and Gen 2 iBoosters?
The two generations look different but perform the same core job. Installation and wiring differ slightly. Gen 1 kits use the original Bosch master cylinder, while Gen 2 kits are designed around compatible 1 1/8-inch master cylinders.
Can I reuse my existing Wilwood master cylinder?
Possibly. The current Gen 2 kit configuration is designed around a 1 1/8-inch bore. Confirm the bore and mounting dimensions before ordering so the complete brake system can be evaluated together.
Can I use a different master-cylinder brand?
The kits are designed around known 1 1/8-inch master-cylinder dimensions. Other brands may work, but unverified dimensions should not be assumed compatible. Contact us before purchase or installation so the measurements can be reviewed.
Will an iBooster work with rear drum brakes?
Yes. A disc-and-drum system can use an iBooster. The complete brake configuration still matters, including residual pressure control and proportioning, so provide your current setup when confirming the kit.
Do I need an adjustable proportioning valve?
An adjustable proportioning valve is recommended when the booster and master-cylinder configuration changes. It allows the front-to-rear brake balance to be tuned for the actual vehicle instead of relying on an original fixed valve.
