Vehicle braking system Audi 100 C4, petrol

Do-it-yourself repair of the brake system
There can't be too much control over such an important element as the brake system! If you occasionally check to see if everything is in order, you will...

How brakes work
When you press the brake pedal, a rod connected to the pedal presses two pistons located one behind the other in the master cylinder (located in the engine...

Checking the brake mechanisms
Constantly checking First, apply full braking at "pedestrian speed". Even with ABS, you can see from the trace on the road whether the brakes are working...

Brake fluid
This yellowish - and, by the way, poisonous and aggressive towards car varnish - liquid does not corrode rubber and metal parts. Even at minus 40°C it remains...

Checking the brake fluid level
Constantly checking Although the indicator on the dashboard will warn you about the low brake fluid level in the Audi-100, you still cannot refuse visual...

Checking the brake system for leaks and damage
TO No.16 To perform the inspection, the underbody must be dry so that you can see the leaky areas. Dark areas from moisture suggest a leak. Check all...

Replacing brake fluid
TO No.35 Changing the brake fluid is necessary not only because of the already mentioned danger of air bubbles, but also because of the danger of corrosion in...

Disc brake mechanisms
Together with the front wheel, a steel disk rotates in the air flow. It is covered in the form of a saddle by the so-called caliper of the disc brake...

Measuring the thickness of the disc brake pads
Disc brake pads, which are large enough for the front wheels, last up to 50,000 km. Despite this, do not forget about regular visual inspection: The minimum...

Checking the condition of brake discs
TO No.17 If the wheels are removed to check the condition of the pads, the condition of the brake discs should also be checked at the same time. There should...

Replacing disc brake pads
In principle, both pads on the right or left must be replaced. Only pads with "General approval for operation" (in German "Allgemeine Betriebserlaubnis" —...

Drum brake mechanism
On front-wheel drive Audi 100 models with 4-cylinder engines produced before October 92. (not equipped with ABS), the rear axle has drum brakes. In this...

Measuring drum brake shoes
TO No.18 Raise the car from behind. Remove the plastic cap on the inside of the corresponding wheel at the rear of the drum brake shield. Shine a flashlight...

Checking the brake pedal travel
TO No.29 Press the brake pedal with your hand. Free travel should be a maximum of ⅓ of the total pedal travel. A longer pedal free play indicates that the...

Rear disc brake mechanism
With the exception of the front-wheel drive model with a 4-cylinder engine, not equipped with ABS, produced before 12/92, the rear axle is equipped with disc...

Measuring the thickness of rear disc brake pads
TO #2 On the rear disc brakes, the wear control of the pads is the same as on the front ones. The wear limit here is also 7 mm - with the thickness of the...

Parking brake system
When the parking brake lever is activated, a rigid rod under the car floor moves forward. At its end is a rocker arm - a balancing bracket. The brake cables...

Checking the free travel of the parking brake lever
TO No.31 The action of the parking brake should begin from the third locking groove of the lever. When the fourth tooth is locked, the rear wheels should be...

Master brake cylinder
The main brake cylinder is a kind of "boss" in the brake system. It is located at the rear left in the engine compartment and gives the brake calipers or wheel...

Brake booster
Disc brakes do not act in a self-amplifying manner, like drum brakes, for example. A significantly higher braking force is required. Therefore, the Audi 100 is...

Checking the brake booster
TO #30 The engine must be turned off. Press the brake pedal 10 times. Now keep the brake pedal fully depressed and start the engine. If the brake booster is...

Brake force regulator
Cars without adjustable ground clearance In the Audi 100, the brake force regulator is located on the left side in front of the rear axle. It can reduce the...

Repair of hydraulic brake drive
Recommendations Brake fluid is poisonous. Therefore, it should not be put into the mouth. Brake fluid is aggressive towards the bodywork. Do not place rags...

Bleeding the brake system
Bleeding the brake system is necessary after repairing the hydraulic drive of the brake system, when air has entered the brake cylinder or pipeline: Note: If...

List of faults in the brake system

ABS is not a panacea!
ABS cannot perform any miracles when braking, as drivers often think; so a significant reduction in braking distance does not occur under all conditions. ABS...

Functions of the main elements of the braking system
Hydraulic block It is located in the engine compartment on the left rear: the hydraulic unit is located between the brake pipes from the master cylinder and...

ABS malfunctions
If the ABS is deactivated, the ABS indicator lights up on the instrument panel. If the engine is switched off and then restarted during this time, the ABS is...

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100(C4, 1990-1994)

100(C4, 1990-1994, petrol)

100(C3, 1982-1990)

100(C3, 1982-1990, petrol)

100(C3, 1982-1990, diesel)