Brake system diagnostics (Opel Vivaro A)

Malfunction	Possible reason
Malfunctions that appear on the brake pedal
Hard pedal:increased force on the brake pedal with a noticeable decrease in braking efficiency	Vacuum booster is faulty Adjustments and brake pads: oiling; complete wear, use of pads with inappropriate linings; overheating, prolonged braking with the pedal constantly pressed (descent from the mountain), use of pads with inappropriate linings
	Seizure of pistons in wheel cylinders
	Blockage of any pipeline due to a dent
Soft pedal 1.When the car is moving. 2. On a parked vehicle with the engine not running. Additional test to check the pedal travel: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the vacuum booster	Presence of air in the brake system: incomplete removal of air from the system
	Fluid leakage through hydraulic drive element seals
	Lack of fluid in the tank (fluid leaking from connections)
Increased brake pedal travel. The check must be carried out on a stationary vehicle with the engine not running. Note: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the brake booster	Incorrect adjustment of the gap between the brake shoes and the drum. Disc and drum brakes: brake mechanisms with automatic adjustment of the gap between the brake shoes and drums - the parking brake drive cable is overtightened. Automatic adjustment of the brake mechanisms with automatic adjustment of the gap between the brake shoes and drums is performed by the brake pedal if the parking brake drive cable is normally tightened with the parking brake lever in the extreme lower position
	Significantly uneven wear of brake pads (the surface of the pads is stepped or concave)
	Increased clearance between the pushrod and the piston of the master brake cylinder
	Boiling or overheating of brake fluid
The brake pedal drops to the floor when pressed lightly.The check must be carried out on a stationary vehicle with the engine not running. Note: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the brake booster	Liquid leak (check the seals)
	Damage to the seal between the two circuits of the master brake cylinder
	Boiling of liquid
Malfunctions on the road
Braking the wheels of a car while it is moving	Adjust the brake pads to fit
	The brake pads are slightly oily
	The tension springs need to be replaced
Squeaking or vibration of brake mechanisms	Ovality of brake drums
	Increased runout of brake discs
	Uneven wear of brake discs
	Presence of deposits on brake discs (oxidation between the pads and the disc)
Car pulls away when braking (front wheels)	The front suspension and steering need to be checked
Car pulls away when braking (front wheels)	Seizure of the working cylinder piston (on vehicles with negative wheel alignment, the vehicle pulling to one side is the result of a fault in the circuit on the opposite side) Tires (wear, air pressure) Brake line blockage due to denting
Skidding when braking (rear wheels)	Brake force regulator (misalignment or malfunction)
	Seizure of the working cylinder piston
	Incorrect adjustment of the clearance between the brake shoes and the drum
	Tension springs
Overheating of brake mechanisms	Insufficient clearance between the pushrod and the piston of the master brake cylinder, which does not allow it to return to its original position
	Seizure or jamming of pistons in working cylinders
	Brake line blockage due to denting
	The parking brake system drive lever is stuck
	Incorrect adjustment of the parking brake system

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Checking the article: Meshcheryakov Damir

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Opel Vivaro A: Brake system

Technical characteristics of the main elements of the brake mechanisms

Removal and installation front brake pads
Removal and installation front brake calipers
Removal and installation the guide pads of the front brake mechanisms
Removal and installation rear brake pads
Removal and installation the master brake cylinder
Removal and installation the brake booster

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