Inspect Condition Of Brake Disks - AP42.10-P-4258AC

Model 205 

with code B07 (AMG - ceramic brake system) 

Shown on model 223.063 

Courtesy of MERCEDES-BENZ USA

3-piece, internally ventilated, drilled compound brake disk with ceramic friction ring and aluminum pan, valid for the front axle 

Courtesy of MERCEDES-BENZ USA

One-piece, internally-ventilated, drilled and slit brake disk with cast iron friction ring, valid for the rear axle 

Courtesy of MERCEDES-BENZ USA

Measurement on cast iron friction ring, shown on model 212, valid for rear axle 

Courtesy of MERCEDES-BENZ USA

	Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of injury  from engine start by remote start function	Prior to starting work, open engine hood, do not reach into rotation range or hazard area of freely rotating parts, wear closed and snug-fitting work clothes	AS00.00-Z-0024-01A
Notice	Notes on repairs to brake system		AH42.00-P-0003-01A
	Remove
1	Remove wheel and tire assemblies.
			AR40.10-P-1102A
	Check brake disks (1) on front axle
2	Check ceramic friction rings for contamination
Notice	Notes on handling, transport and storage of ceramic brake disks	If ceramic friction ring is contaminated by oil or grease, ↓ replace brake disk (1). After obtaining special order.	AH42.10-P-9406-13A
3	Check ceramic friction rings for damage.
		The wear of the ceramic friction rings cannot be assessed by means of a visual check! If the brake disk (1) exhibits damage that makes replacement necessary, ↓ replace brake disk (1). After obtaining special order.	AR42.10-P-0290-01RG
	Risk of injury  to skin and eyes from laser beams	Never look directly into the laser beam. Do not attempt to suppress natural reflex of closing the eyelids. Avoid direct skin contact with the laser beam. If damage to the eye is suspected, consult an eye specialist immediately.	AS30.30-Z-0001-01A
4	Check ceramic friction rings for wear.
		If ceramic friction ring is worn, ↓ replace brake disk (1). After obtaining special order.	AR42.10-P-0264-01RG
	Check brake disks (1) on rear axle
5	Assess cast iron friction rings for score marks, cracks, corrosion and contamination (e.g. oil, grease).	If the crack length (2) ≥ 25 mm (0.98 Inch) or if it extends up to the inner or outer edge of the friction ring, if there are gaping cracks or score marks deeper than 0.5 mm (0.02 Inch), or where pitted corrosion is present, ↓ replace brake disks (1) per axle. After obtaining special order.
6	Assess cast iron friction rings for wear.	If deeply contoured ridging is present at the outer edge, ↓ replace brake disks (1) per axle. After obtaining special order. If, in exceptional cases, assessment of cast iron friction rings is not possible by means of a visual check, ↓ Measure brake disks (1), continue with operation step 7.
	Measure
7	Measure cast iron friction rings using vernier caliper (010).	Model 205Brake disk thickness	*BE42.10-P-1001-09U
		Caliper gauge If the wear limit has been exceeded or will be exceeded before the next brake pad change, ↓ replace brake disks (1) per axle. After obtaining special order.	Fig 1
	Install
8	Install wheel and tire assemblies.
			AR40.10-P-1102A

Fig 1: Identifying Caliper Gauge (140 589 00 19 00)

Courtesy of MERCEDES-BENZ USA