When do you need a brake master cylinder replacement?

How much does it cost for brake master cylinder replacement?

Depending on the make and the model, the cost of a brake master cylinder varies and is anything between $300-$800. In branded vehicles like Mercedes Benz, brake master cylinder costs between $150-$450. The price differs depending on the axle and the brake pad.

Instead of going for an OEM brake master cylinder, you can try an aftermarket brake master cylinder, where the cost is 80% lower than the OEM price and the best part is, the auto part is a company manufactured original part sourced by a reliable online aftermarket auto part store.

How does the brake master cylinder work?

  • The braking system stops a vehicle in motion. Using friction between two surfaces, the system converts kinetic energy to heat and stops the vehicle. Using artificial resistance, the vehicle is stopped. This friction is achieved from a combination of techniques. The brake force deaccelerates, the wheel rotation assumes a linear speed by static frictional force or tangential force acting in the opposite direction of motion.
  • Many moving parts make the brake master cylinder. A normal master cylinder supplies a whole brake circuit.
  • A tandem brake master cylinder uses a primary and a secondary piston just like a bore.
  • Every vehicle has a disc brake and a drum brake on the front and rear wheel with a proportioning valve.
  • These valves signal the drum wheel engagement which is followed by the disc brake engagement.
  • In a tandem brake master cylinder, the secondary piston completes its circuit with the drum brake and the primary completes the circuit to the disc brake.
  • When the brake pedal is pressed it triggers the primary and secondary piston to press down.
  • The pressure build-up in the master cylinder gets pushed further on as the brake pedal lowers and the pressure between the primary and secondary piston leads the secondary piston to compress the fluid.
  • The filler cap with a tiny hole is attached to the brake fluid reservoir, allowing the fluid to fluctuate without pressure. The sealed cap keeps contaminants away from the brake fluid.
  • The fluid level is tracked by a fluid level sensor in the brake reservoir. The brake light turns on when the pressure imbalance occurs. This signals reservoir inspection.
  • The hydraulic pressure reaches the brake pads on the wheels through a brake oil or fluid-filled tube.
  • Both pistons act as two individual brake master cylinders, a disparity in one of them will make the foot pedal sink deeper and the pistons will overlap at the end of the bore.
  • When the brakes are applied the single-piston floating calipers adjust and center with the brake force and the position pushes the pads on all four wheels. As the brake makes slight contact with the rotor the brake pads clamp.
  • Brake pads are used only when the brake is pushed and are on either side of the disc.
Pros & Cons of brake master cylinder

The advantages of the brake master cylinder have been divided into four subcategories.

Advantages of drum brakes:
  • Has a cheaper production and purchase cost.
  • Used along with disc brakes.
Advantages of disc brakes:
  • Allows heat dissipation.
  • Does not collect water or dust despite being open, unlike drum brake.
Advantages of hydraulic brake
  • Less wear because as there are no joints or construction.
  • The high-speed breaking frictional loss is reduced as the brake fluids act as lubricants.
Advantages of antilock brakes
  • With advanced obstacle sensing features, brake locking, and skidding are avoided.
  • Maintains smooth steering in vehicles.
Advantages of electromagnetic brakes
  • With no physical contact, it endures less wear and tear.
  • Low hear generation compared to others.
  • No maintenance reduces cost.
Disadvantages of drum brakes
  • The enclosed structure collects water during rains affects function as water does not drain out.
  • Is more heated and the air inlet is limited.
Disadvantages of disc brakes
  • They are inefficient in parking as brake pads cannot keep a smooth rotor system.
  • They are effective in reducing speed but cannot stop the vehicle.
Disadvantages of hydraulic brakes
  • The brake shoes spoil if the brake fluid leaks.
  • High moisture can change the fluid quality causing the internal components to corrode.
  • If the outside temperature increases the fluid will bubble and boil with a loss of pressure the brake system will function inefficiently.
Disadvantages of antilock brakes
  • The installation and maintenance costs are steep.
  • Delicate system and needs more attention for upkeep.
Disadvantages of electromagnetic brakes
  • The battery drains quickly.
  • The residual magnetism delays the brake shoe from returning to its original position.

Why select Big Mouth Direct to buy brake master cylinder replacement?

  • Big Mouth Direct inspects the quality of the brake master cylinder before shipping it to you.
  • They guide a customer through the buying process and in knowing if they need a master cylinder or an ABS pump.
  • If a customer orders for 541, that is what they get. Customers must not assume they will get 545 (abs), which is included, only if the difference is paid for.
  • They are highly knowledgeable about car parts.
  • Your buying journey is improved when you transact with them.
  • They give a warranty on every part they sell.

How do I know if my brake master cylinder is bad?

The important components of the brake master cylinder make the braking system function effectively.

The brake master cylinder converts the applied mechanical pressure on the brake pedal to hydraulic pressure.

The brake calipers wring the brake pads to slow down the vehicle.

The brake master cylinder is also prone to failures like the other components in the vehicle.

Here is a list of some of the most distinct signs of brake master cylinder replacement.

  • Since the brake master cylinder generates pressure, any change in the delivery of pressure will be felt in the brake response.
  • With age and wear the defects in the brake master cylinder surface with the spongy, pushy, slow sinking of the brake pedal. The brake pedal is connected with a push rod with the brake master cylinder. For activating the brake in the front and rear wheels, the right amount of hydraulic pressure needs to be generated by the brake master cylinder. A problem in this function causes the pedal to feel spongy and mushy.
  • Poor sealing and the presence of air in the brake line will also cause a spongy feel on the pedal. Damage in the brake line with rust can make the pedal feel spongy and depressed.
  • When the brake fluid level decreases a warning light shows up. It can also indicate a problem with the brake master cylinder or a brake leakage.
  • Check for leaks in the brake master cylinder proportioning valves that connect the separate brake circuits along with the fluid control valve conveying fluid from the brake fluid reservoir to the master cylinder.
  • You should have the system checked and if required, go for a brake master system replacement.
  • If the brake pedal does not return to its normal position, you need to get the extent of damage in the brake master cylinder evaluated and if required a brake master system replacement may be the best option as driving with a sinking pedal can be dangerous.
  • Opening the brake fluid reservoir on top of your master cylinder will reveal a metal reservoir, use a screwdriver to check the retaining clamp placed at the top.
  • The cups should touch the surface of the brake fluid and are pushed up when there is full fluid preventing evaporation while keeping dust and dirt away. The brake fluid should maintain the full line of the cylinder side or 1/2 inch of each chamber.
  • Carefully look for strain marks, wetness, gunk. Look for leaking signs.