Possible malfunctions of the brake system, their causes and remedies (Chassis / Brake system / Ford Focus 2 2004-2010)

Cause of malfunction	Remedy
Increased brake pedal travel
Leakage of brake fluid from working brake cylinders	Replace failed working brake cylinders, wash and dry pads, discs and drums
Air in the brake system	Remove air by bleeding the system
Damaged rubber o-rings in the master cylinder	Replace cylinder assembly
Damaged rubber hoses hydraulic brakes	Replace hoses and bleed system
Increased beat (more than 0.05 mm) brake disc	Grind or replace the disc if the thickness of the brake discs of the front wheels is less than 23.0 mm, and the rear (if available) - less than 9.0 mm
Insufficient braking performance
Lubrication of linings of pads of brake mechanisms	Rinse and dry pads
Jamming of pistons in working cylinders	Eliminate the causes of jamming, replace damaged parts
Complete wear of brake pads	Replace brake pads
Overheating of the brakes	Stop immediately and let the brakes cool down
Use of low quality pads	Use original pads or the projection of firms specializing in the production of parts for brake systems
Violation of the tightness of one of the circuits (accompanied by brake pedal failure)	Replace damaged parts, bleed the system
Violation of the position of the brake pedal (the distance from the pedal to the floor is less than normal)	Check the condition of all parts and assemblies of the hydraulic brake drive and replace the faulty ones
Violations in the operation of the anti-lock braking system	Contact the service to check the anti-lock brake system
Incomplete release of all wheels
No free play on the brake pedal	Check the condition of all parts and assemblies of the hydraulic brake drive and replace the faulty ones
Swelling of the rubber seals of the main cylinder due to the ingress of gasoline, mineral oils, etc. into the liquid.	Flush and bleed the entire hydraulic drive system, replace rubber parts
Jamming of master cylinder pistons	Check and, if necessary, replace the master cylinder
Braking of one wheel when the pedal is released
Broken or weakened return spring of the rear drum brake pads	Replace spring
Seizure of the piston in the working cylinder due to contamination or corrosion of the body	Replace the slave cylinder and bleed the hydraulic brake system
Swelling of the sealing rings of the working cylinder due to the ingress of foreign impurities into the liquid	Replace slave cylinder and bleed hydraulic brakes
Violation of the position of the caliper relative to the brake disc when the mounting bolts are loosened	Tighten the mounting bolts, if necessary, replace damaged parts
Incorrect adjustment of the parking brake system Violations in the operation of the anti-lock brake system	Adjust the parking brake system Have the anti-lock brake system checked by a dealer
Skidding or pulling the car to the side when braking
Jamming of the piston of the working cylinder	Check and eliminate jamming of the piston 8 cylinder
Blockage of any tube due to a dent or blockage	Replace or clean tube
Dirty or oily discs, drums and brake pads	Clean the brake parts
Wheel alignment misaligned	Adjust wheel alignment
Different tire pressure	Set the required tire pressure
One of the brake circuits does not work (accompanied by a decrease in braking efficiency)	Replace damaged parts and bleed the system. If on a vehicle equipped with ABS, this does not lead to the desired result, contact the service to check the anti-lock system
Increased effort on the brake pedal when braking
Faulty vacuum booster	Replace amplifier
The hose connecting the vacuum booster and the engine intake pipe is damaged or its fastening is loose	Replace hose
Swelling of rubber cylinder seals due to the ingress of gasoline, mineral oils, etc. into the liquid.	Replace cylinders, flush and bleed system
Squeal or vibration of the brakes
Oiling of friction linings	Scrub the pads with a wire brush using warm water and detergent. Eliminate the causes of fluid or grease getting on the brake pads
Worn pads or foreign inclusions in them	Replace pads
Excessive runout or uneven wear (felt by the vibration of the brake pedal) brake disc	Grind or replace the disc if the thickness of the brake discs of the front wheels is less than 23.0 mm, and the rear (in the absence) - less than 9.0 mm

Possible malfunctions of the brake system, their causes and remedies

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