Possible malfunctions of the brake system (VAZ-2115)

Possible malfunctions of the brake system and methods for their elimination are given in the table:

Cause of malfunction	Method of elimination
Increased brake pedal travel
Brake fluid leaking from wheel cylinders	Replace defective wheel cylinder parts, wash and dry the pads, discs and drums, bleed the hydraulic drive system
Air in the brake system	Remove air from the system
The rubber seals in the brake master cylinder are damaged	Replace the rings and bleed the system
The rubber hoses of the brake hydraulic drive are damaged	Replace the hoses and pump up the system
Increased brake disc runout (more than 0.15 mm)	Sand the disc; if the thickness of the disc is less than 17.8 mm, you should replace brake disc
Fluid leaking through the pressure regulator pusher seal rings	Replace the o-rings
Insufficient braking efficiency
Oiling of brake pad linings	Wash and dry the pads
Seizure of pistons in wheel cylinders	Eliminate the causes of jamming, replace damaged parts, bleed the system
Complete wear of brake shoe linings	Replace the brake pads
Overheating of brake mechanisms	Stop immediately and allow the brakes to cool down
Use of pads with inappropriate linings	Use only brake pads recommended by the manufacturer
Incorrect adjustment of the pressure regulator	Adjust the pressure regulator drive
Loss of tightness of one of the circuits (accompanied by a partial failure of the brake pedal)	Replace damaged parts, bleed the system
Incomplete release of braking of all wheels
There is no free travel of the brake pedal	Adjust the pedal free play
The protrusion of the adjusting bolt of the vacuum booster rod relative to the mounting plane of the master cylinder is damaged	Adjust the protrusion of the adjusting bolt by 1.25-0.2mm
Swelling of the rubber seals of the master cylinder due to gasoline, mineral oils, etc. getting into the liquid.	Thoroughly flush the entire system with brake fluid, replace rubber parts, bleed the hydraulic drive system
Master cylinder piston jamming	Check and replace the master cylinder if necessary, bleed the system