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.
Brake System: Notes
Vehicles equipped with anti-lock brake system (ABS) and ABS/traction control do not use a proportioning valve. Hydraulic pressure to the brake assemblies is controlled by the hydraulic control unit (HCU) as directed by the electronic control unit (ECU). Non-ABS station wagons use 4-wheel disc brakes and are equipped with a proportioning valve in the engine compartment. Non-ABS sedans use drum brakes in the rear and are equipped with a junction block in the engine compartment and a brake load sensing-proportioning valve in the rear. During braking, weight is shifted to the front of the vehicle, causing the rear to rise. The brake load sensing-proportioning valve is mounted on the body and is attached to the rear suspension lower control arm. As the body and suspension separate, the valve proportions pressure to the rear wheels to prevent premature rear brake lock-up.
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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.