Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Hydraulic Modulator: Notes
Hydraulic modulator controls hydraulic pressure to the front calipers and the rear wheel cylinders by modulating hydraulic pressure to reduce the tendency of wheel lock-up. The basic hydraulic modulator configuration consists of gear subassemblies, ball screws, nuts, pistons, and hydraulic check valves. The motor pack consists of 3 motors, 3 drive gears and 3 ESBs.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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