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2005 BMW 325Ci Base Convertible
BMW Home > 2005 BMW 325Ci Base Convertible > BrakesBrake Hydraulics 

Brake Hydraulics

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Brake Booster Vacuum Pumps

If your brake pedal is getting harder to push you may have a faulty vacuum pump in your brake booster system. Used on power brake cars, they accept a vacuum hose and pump from the engine manifold, and use that vacuum pressure to assist in the movement of the master cylinder.
Brake Booster Vacuum Valve - Intake Manifold to Brake Booster Hose (Sucking Jet Pump)

ABS Units and Parts

If your ABS is not working correctly it might be one of your control units. The ABS control unit processes information from the various sensors to properly modulate hydraulic pressure.

ABS Sensors and Relays
The ABS sensors and relays measure the different information within the braking system and send the information to the ABS control unit. If your ABS is starting to act up check your sensors and relays right away.
ABS Sensor (Rear Left or Right)

ABS Sensor (Front Right)

ABS Sensor (Front Left)

ABS Cycle Relay (5-Prong) (Black)  
[ More Info ]

Note: Only for cars with Sequential Manual Gearbox (SMG).

Genuine BMW
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Stability Control Parts

Stability Control Sensors
The stability control system can be a very complicated series of devises. Before you start tearing into your check these sensors first.
Pressure Sensor for Dynamic Stability Control (DSC)
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Page last updated: Tue 3/20/2018 11:15:08 PM
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