Vehicle braking system Audi A4 B5, petrol

Do-it-yourself work on the brake system
In such important equipment as the brake system, no control can be excessive! And if you keep order in this area, you will perform maintenance work better than...

This is how the braking system works
When you press the brake pedal, a pushrod connected to the pedal pushes two pistons located one behind the other into the master cylinder (in the engine...

Checking the brakes
Constant control 1. First, test full braking at walking speed. 2. Based on the rubber marks on the road, including if ABS is present, you will see whether the...

Brake fluid
Between the engine compartment and the windshield, in the so-called moisture-trapping box, there is a reservoir with brake fluid (1), the main brake cylinder...

Checking the brake fluid level
Constant control 1. In the Audi A4, a low brake fluid level is also indicated by a warning light on the dashboard, but you should still not give up visual...

Checking the brake system for leaks and damage
When checking, the bottom of the car must be dry so that you can see the leaky areas. Brake fluid also spreads under dirt. Dark spots from dampness may be...

Replacing brake fluid
Brake fluid needs to be changed not only because of the above-mentioned danger of steam bubbles, but also because of the danger of corrosion developing in the...

Disc brakes
Along with each wheel, a steel disk rotates freely in the air flow. The so-called calipers saddle-shapedly embrace the disks. When you press the brake pedal,...

Measuring the thickness of the front disc brake pads
The large brake pads of the front disc brakes often last for more than 50,000 km. Checking the thickness of the pads is of great importance for safety – the...

Checking the condition of the brake discs
If the front wheels are removed to check the brake linings, the condition of the brake discs is also checked at the same time. There should be no deep grooves...

Replacing disc brake pads
Always replace both pads at the same time, left and right. Use pads with ABE only (General Permit to Operate). If the brake is made by Lucas, then two new...

Rear disc brakes
Just like on the front axle, the disc brakes on the rear axle are so-called cam-caliper brakes. In addition to the hydraulic drive of the foot brake, the rear...

Measuring rear disc brake pads
Measuring the thickness of the brake lining on the rear wheels: 1 - lining material; 2 - metal supporting plate. The wear control of the rear disc brake pads...

Handbrake
When the handbrake is applied, a kind of rocker arm is pulled out from behind the lever. The brake cables that go back to the brake calipers are also suspended...

Checking the idle stroke of the handbrake lever
Handbrake cable on rear brake caliper housing Handbrake in quattro model 1 - stop; 2 - control lever (handbrake lever); 3 - handbrake cable nipple; 4 - spring...

Adjusting the handbrake
Details of the adjusting element A - fine adjustment; B - coarse adjustment; C - adjusting nut; D - fixing clamp. The adjustment mechanism (1) with the locking...

Master brake cylinder
The brake master cylinder is, to some extent, the main element of the brake system. It is located at the rear left of the engine compartment and signals the...

Brake booster — general information
The auxiliary force is provided by the reduced pressure in the intake manifold. The brake booster is connected to the intake manifold by a hose. When braking,...

Checking the brake booster
Area around the brake booster with a 1.6L engine: 1 – brake fluid reservoir; 2 – brake booster; 3 – vacuum tube from the intake manifold; 4 – ejector for...

Work on the hydraulics of the brake system
Execution order 1. Brake fluid is poisonous. Therefore, do not touch it with your mouth or open wounds. 2. Brake fluid corrodes car paint. Therefore, do not...

Bleeding the brake system
The brake system must be bled after repairing the hydraulic drive if air gets into the brake cylinders and brake pipes. Execution order 1. Fill the expansion...

Help with brake system problems
Malfunction Its reasons Your help A. The brakes are pulling on one side 1. Tire pressure is not uniform 2. The tread pattern is worn unevenly 3. The pads are...

ABS and EDS
The figure shows the basic design of the anti-lock system in the Audi A4. ABS cannot create the braking miracle that is often assumed; the braking distance...

Function of individual ABS units
Hydraulic module The hydraulic module (1) of the anti-lock system is located at the front left in the engine compartment. It is connected via a central...

Electronic Brakeforce Distribution (EBV)
The Audi A4 dispenses with the traditional brake force regulator for the rear wheels. Instead of mechanical or hydraulic pressure control, a hydraulic ABS...

Malfunction of the ABS system
When the ignition is switched on, the ABS indicator light on the instrument panel flashes. It should go out when the engine starts, or at the latest when the...

Electronic Differential Lock (EDS)
Electronic differential lock (Elektronische Differential-Sperre) does not work in the main transmission by means of mechanical differential coupling or by...

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A4(B8, 2007-2015)

A4(B7, 2004-2008)

A4(B6, 2000-2006)

A4(B6, 2000-2006, petrol)

A4(B5, 1994-2001)

A4(B5, 1994-2001, petrol)