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Section 2
MASTER CYLINDER
Lesson Objectives
1. Explain the difference between conventional and diagonal split piping system and their application.
2. Describe the function of the compensating port of the master cylinder. 3. Explain the operation of the residual check valve on the drum brake circuit of the master cylinder.
4. Explain the safety advantage of having two hydraulic circuits in the master cylinder.
5. Describe the difference between the Portless and Lockheed master cylinders. 10
LEXUS Technical Training
Master Cylinder
Master Cylinder
The master cylinder converts the motion of the brake pedal into hydraulic pressure. It consists of the reservoir tank, which contains the brake fluid; and the piston and cylinder which generate the hydraulic pressure.
The reservoir tank is made mainly of synthetic resin, while the cylinders are made of cast iron or an aluminum alloy.
Master Cylinder
Stores brake fluid and converts the motion of the brake pedal into hydraulic pressure.
Tandem Master The tandem master cylinder has two separate hydraulic chambers.
Cylinder This creates in effect two separate hydraulic braking circuits. If one of these circuits becomes inoperative, the other circuit can still function to stop the vehicle. Stopping distance is increased significantly, however, when operating on only one braking circuit. This is one of the vehicles’ most important safety features.
Conventional On front−engine rear−wheel−drive vehicles, one of the chambers
Piping provides hydraulic pressure for the front brakes while the other provides pressure for the rear.
Section 2
Conventional Piping for Front Engine
Rear Drive
When one circuit fails the other remains intact to stop the vehicle.
Diagonal Split Piping On front−engine front−wheel−drive vehicles, however, extra braking load is shifted to the front brakes due to reduced weight in the rear. To compensate for hydraulic failure in the front
MASTER CYLINDER
Lesson Objectives
1. Explain the difference between conventional and diagonal split piping system and their application.
2. Describe the function of the compensating port of the master cylinder. 3. Explain the operation of the residual check valve on the drum brake circuit of the master cylinder.
4. Explain the safety advantage of having two hydraulic circuits in the master cylinder.
5. Describe the difference between the Portless and Lockheed master cylinders. 10
LEXUS Technical Training
Master Cylinder
Master Cylinder
The master cylinder converts the motion of the brake pedal into hydraulic pressure. It consists of the reservoir tank, which contains the brake fluid; and the piston and cylinder which generate the hydraulic pressure.
The reservoir tank is made mainly of synthetic resin, while the cylinders are made of cast iron or an aluminum alloy.
Master Cylinder
Stores brake fluid and converts the motion of the brake pedal into hydraulic pressure.
Tandem Master The tandem master cylinder has two separate hydraulic chambers.
Cylinder This creates in effect two separate hydraulic braking circuits. If one of these circuits becomes inoperative, the other circuit can still function to stop the vehicle. Stopping distance is increased significantly, however, when operating on only one braking circuit. This is one of the vehicles’ most important safety features.
Conventional On front−engine rear−wheel−drive vehicles, one of the chambers
Piping provides hydraulic pressure for the front brakes while the other provides pressure for the rear.
Section 2
Conventional Piping for Front Engine
Rear Drive
When one circuit fails the other remains intact to stop the vehicle.
Diagonal Split Piping On front−engine front−wheel−drive vehicles, however, extra braking load is shifted to the front brakes due to reduced weight in the rear. To compensate for hydraulic failure in the front