Brake booster repair 

35. How to diagnose and repair Booster
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In this video we will see:
0:00 Introduction
1:20
The review or diagnosis of the brake system and brake booster, also known as brake booster, hydrovac, brake booster, vacuum booster unit, power brake unit, etc., is presented.
The brake booster is installed between the brake pedal and the master cylinder or brake master cylinder and serves, by means of the engine vacuum, to give a pneumatic aid so that the brake pedal, when pressed, produces greater braking power.
The typical failures of the brake booster are explained, and the symptoms that are a hard pedal due to a broken diaphragm, a low pedal or the car stopping only because the atmospheric valve is damaged, that the brake has no braking power due to vacuum deficiency from the engine, as well as engine failures due to vacuum leaks in the booster, also explains the operation and importance of the check, retention or one-way vacuum valve of the booster.
In the booster diagnostic process to detect faults, it is observed that there are vacuum leaks, where it is observed that it makes noise in the brake pedal, it can also be observed that the car brakes or only the brake is applied due to that the brake stem comes out on its own due to booster failure, although the vacuum leak in the booster could be due to a ruptured diaphragm this is not the case.
The procedure of how to change the brake booster or brake servo, how to uncouple the master cylinder or master cylinder, and how to disassemble the brake pedal under the dashboard is presented.
In the workbench it is explained how the brake booster works, mentioning the vacuum chamber and the atmospheric chamber, the operation and failures of the atmospheric valve and the revision of the parts, the disassembled booster is presented, with this procedure it is also possible to rebuild or repair the brake booster.
With the help of a vacuum pump and a vacuum manometer, tests are carried out outside the booster car, observing how the stem comes out by itself and that it does not retain the vacuum, so it is discarded and the same tests are carried out on a replacement booster. the operation of the one-way check valve, retention, for vacuum retention is explained,
The installation and tests of the booster are presented, with this procedure and tests to see if the booster works. In this case, the booster does not have an adjustment, so it is not necessary to adjust, in addition to the fact that only the master cylinder moved, so it is not necessary to bleed the brake system, when doing a brake check it is advisable to see the state of health of the booster, in addition to observing that there is no brake fluid leak in the booster
35. As Diagnosis and repair of Booster, brake booster, or servobrake, disassembly and revision of diaphragm, atmospheric and vacuum valve. diaphragm, change, valve, vacuum, remove, rebuild, rebuit, replace, system, pump, brake, power, master, cylinder, installarion, test, testing, repair, maintenance, leak, check, replacement, auto, invention, tests,
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Disassembled to replace the brake booster
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The engine fails due to loss of vacuum in the booster
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Disassembled to replace the brake booster
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