clutch booster
5 week ago
1. Function
Power assist function: hydraulic, pneumatic or vacuum pressure assists the driver in operating the clutch to reduce foot fatigue (especially in the case of frequent gear changes).
Transmit power: Amplify the driver's pedal force and transmit it to the clutch release bearing to ensure smooth separation of the clutch pressure plate.
2. Type
(1) Hydraulic booster
Principle: Similar to a brake booster, it uses a hydraulic system (master/slave cylinder) to transmit pressure, possibly with a vacuum assist.
Common models: Most passenger cars use hydraulic clutch systems.
(2) Pneumatic booster
Principle: It is mostly found in commercial vehicles (such as trucks and buses), using compressed air to provide assistance, and needs to be combined with air storage tanks and air compressors.
Features: Stronger power effect, suitable for heavy vehicles.
(3) Mechanical type (cable pull type)
Principle: direct mechanical transmission of force through lever or cable, no additional assistance (used by some older models).
3. Main structure
Hydraulic Master Cylinder: Converts pedal force into hydraulic pressure.
Assist device: vacuum/pneumatic booster (amplified pressure).
Driven cylinder (sub-pump): receives hydraulic pressure and pushes the clutch fork.
Reservoir: Store hydraulic oil (hydraulic system).
4. Common faults and manifestations
Power failure: The pedal becomes heavier, which may be due to vacuum tube leakage, insufficient air pressure or hydraulic fluid leakage.
Clutch slippage: Poor booster return prevents the pressure plate from fully engaged.
Abnormal noise: wear of internal mechanical components (e.g., bearings, push rods).
Hydraulic problems: Insufficient fluid or air intake, resulting in soft pedals and long strokes.
5. Maintenance and precautions
Regular inspection: hydraulic oil level, pipeline tightness (hydraulic type); Leakage of the air pressure system (pneumatic).
Oil replacement: Hydraulic oil needs to be replaced according to the maintenance cycle to avoid moisture or impurities mixed in.
Exhaust operation: After the hydraulic system is repaired, the air needs to be exhausted to prevent the pedal from weakening.
Timely repair: If you find abnormal pedal resistance or incomplete clutch disengagement, check the booster.
6. Relationship with clutch master cylinder/sub pump
Master Cylinder: Connects the pedal to generate initial hydraulic pressure.
Booster: located between the main cylinder and the sub pump, amplifying the pressure (integrated on the master cylinder in some models).
Split pump: receives the pressure after the assist and pushes the clutch fork.
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