Master Cylinder
The master cylinder converts the push on the brake pedal into hydraulic pressure for the brakes.
What is Master Cylinder?
It has two circuits so that half the brakes still work if one fails. The brake fluid reservoir sits on top. On cars with ABS and stability control, the master cylinder feeds the hydraulic unit, which can then adjust pressure at each wheel.
How it works
Pistons in the cylinder push fluid into the brake lines.
Why it matters for your car
A pedal that sinks slowly to the floor can indicate a worn master cylinder. Old, moist brake fluid can corrode the bore and seals, which is one reason the fluid should be changed at the recommended interval.
Other terms
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- Cold Air Intake
- Diesel Engine
- Diode
- Engine Surging (Hunting Idle)
- EV Mode (Electric-only Mode)
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- Gas Strut (Gas Spring)
- Interior Detailing
- Main Beam (High Beam, Full Beam)
- New Car Warranty
- Panel Gap
- Piston Slap
- Stabiliser Hitch
- Torque Converter Lock-up Clutch
- Turning Circle
- Tyre Dressing
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