Brake system fault diagnostics (Nissan Murano Z50)

Sign of malfunction	Possible cause	Solution
1	2	3
The brake pedal free play is too great	All or some of the pads are worn out	Adjust or replace brake pads
The brake pedal free play is too great	One of the brake circuits failed	Check for brake fluid leaks in the circuits
The brake pedal springs and sinks	Presence of air in the brake system	Bleed the brake system
	Low fluid level in the reservoir	Add new brake fluid. Remove air from the system
	Formation of steam bubbles under heavy brake load	Replace the brake fluid. Remove air from the system
Reduced braking efficiency, hard pedal	Pipeline leakage	Secure the pipe connections or replace the pipes
	Damage to the seals in the master cylinder or wheel cylinders	Replace the cuff. In the case of the master brake cylinder, replace its internal components or the cylinder itself
	Damage to the sealing cuff between the brake circuits in the master brake cylinder	Replace the cuff
	The stationary rubber seal is damaged	Repair the caliper
Poor brake performance despite high pedal effort	The brake linings are oily	Replace the brake pads, use only original pads
	The wrong type of brake pads are installed	Replace the brake pads, use only original pads
	The brake booster is faulty. The vacuum hose is cracked or damaged	Check the brake booster and vacuum hose
	Hydraulic system jamming	Ensure smooth movement of the brake caliper, replace the slave cylinder
	Contamination of the hydraulic system	Clean the hydraulic system, replace the brake fluid
	The brake pads are worn out	Replace the pads
The brakes lock up when braking lightly	The brake pads are slightly oily	Replace the brake pads
The brakes lock up when braking lightly	The return springs have weakened	Replace the return springs
The brakes get hot while driving	The compensation hole in the master brake cylinder is clogged	Clean the master cylinder and replace its internal components
	Too small clearance between the push rod and the master cylinder piston	Check the piston movement to see if it returns to its original position
	Piston sticking or heavy piston running	Ensure easy piston movement
	The pipeline is clogged	Clean the line, replace the brake fluid
	Parking brake drive jammed, parking brake incorrectly adjusted	Adjust the parking brake
The brake pads do not separate from the brake disc, and the wheel is difficult to turn by hand	Corrosion in brake caliper cylinders	Repair the caliper, perhaps replace it
Uneven wear of brake pads	Incorrect brake pads installed	Replace the brake pads using original pads
	The caliper is dirty	Clean the caliper bores
	Heavy piston stroke	Ensure easy piston movement
	Brake system leakage	Check the brake system for leaks
When braking, the car pulls to the side	Tire pressure is not correct	Check and adjust tire pressure
	Uneven tire wear	Replace worn tires
	The brake linings are oily	Replace the brake pads
	Damage to suspension or steering components	Check suspension and steering components
	Different types of brake pads are installed on one axle	Replace brake pads using only original brake pads
	Defect of the working surface of the brake pad	Replace the brake pads
When braking, the car pulls to the side (continuation)	The pipeline is clogged	Check the brake pressure on all 4 wheels
	The support shafts are dirty	Clean the seating and guide surfaces of the pads in the caliper
	The brake caliper cylinders are damaged by corrosion	Replace the calipers on both wheels
	Uneven wear of the brake pad	Replace the brake pads on both wheels
The presence of a squeal when braking	Atmospheric influence (humidity)	If the creaking appears after a long period of parking in high humidity and then disappears, there is nothing to do
	Incorrect brake pads installed	Replace the brake pads using original pads and apply anti-squeal paste to the rear plates
	The brake pad is not parallel to the brake disc	Check the fit of the brake pad in the caliper
	Contamination of the brake caliper shaft	Clean the brake caliper shaft
	Poor adhesion of brake pads	Replace the brake pads
	The brakes are dirty	Clean the brakes
	The brake shoe return springs are weakened	Replace the return springs
The brakes are pulsating	Lateral runout or thickness variation of the brake disc is too great	Check runout and thickness tolerance. Grind the disc or replace it
	The brake disc does not rotate parallel to the caliper	Check the caliper mating surface
	ABS is working	This is a normal phenomenon and does not require any correction
Braking with the pedal released	The compensation hole in the master cylinder is dirty	Clean the master cylinder, replace its internal parts or the entire cylinder
Braking with the pedal released	The clearance between the rod and the piston of the master brake cylinder is too small	Check the gap
Knocking noise in the brakes	Incorrect brake pads installed	Replace brake pads using only original brake pads
	Disc corrosion	Carefully grind the disc with a grinding stone
	Lateral runout of the disc	Grind or replace the disc
Wedge-shaped wear of brake pads	The brake disc does not rotate parallel to the brake caliper	Check the brake caliper mating surface
	Caliper corrosion	Clean the caliper
	The piston is not working properly	Ensure easy piston movement