Checking lining thickness of the brake pads, Condition of the brake discs (Wheels removed, 4050) - wh4251pkw0000x(4251)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Models 107 from 08/85; 126 from 09/85; 124, 129, 140 to 06/93; 201

Change: text revised

Fig 1: Identifying Brake Pad

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Measuring Brake Disc Thickness

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Lining thickness of brake pads (43)	check on front and rear brakes (visual check, brake pads installed) replace brake Note pads, if required (RI 42-0160).
NOTE: Observe recommended limit (see table) to ensure that wear limit is not exceeded before next maintenance service.
Brake discs (61)	check for cracks and scoring. It is not necessary to replace ventilated brake discs with hairline cracks with a length up to 25 mm resulting from high stress. Replace brake discs with gaping cracks and scoring deeper than 0.5 mm immediately (RI 42-0220, 42-0228).
Brake disc (61)	check for contamination. Brake discs which are heavily contaminated - recognizable by grey or blue discoloration of braking surfaces - must be cleaned with cleaning pads at extra cost (RI 42-0260).
Brake disc thickness	measure with caliper gauge (035) (arrow). Observe wear limit for brake discs under all circumstances. Observe limit (see table) to ensure that wear limit is not exceeded before next scheduled maintenance.

Fig 3: Locating Wear Limit Of Brake Discs

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

TEST VALUES FOR FRONT BRAKE PADS IN MM

Model

107 ⁽¹⁾ 126 124.031/034 ⁽²⁾/ 036/051/091 129 201.036

124 (not including 124.008/029/ 031/032/034/ 036/051/052 091/092) 201.034/035

124.008/ 029/032/ 034 ⁽³⁾ / 052/092

140.03/1 with 2-piston fixed calipers

140 with 4-piston fixed calipers

201.01
201.02
201.1

Thickness of brake pad (pad backing plate and lining)

17,5

19,3

18,5

19,3

17,9

Limit for maintenance service (pad backing plate and lining)

Permissible brake lining wear down to lining thickness of

⁽¹⁾	¹ ) The backing plate on the brake pad has been adapted to the 4-piston fixed calipers on this model as of 09/85. Installation of brake pads of models 123 and 126 is therefore no longer possible.

⁽²⁾	² ) , up to 9/92.

⁽³⁾	³ ) Installed as of 10/92.

TEST VALUES FOR REAR BRAKE PADS IN MM

Model	107	124.036 ² )	201.01
	124 ¹ )	129.07	201.02
	126	140	201.1
	129.06
	201.03
Thickness of brake pad (lining backing plate and lining)	15,5	16	13,5
Limit during maintenance service (lining backing plate and lining).	11	13	10
Permissible brake lining wear down to lining thickness of	2	2	2
¹ ) Installed up to 11/92 on model 124.036
² ) Installed as of 12/92

TEST VALUES FOR FRONT BRAKE DISCS IN MM

Model

Brake disc thickness

Wear limit

Limit for maintenance service

124.003 ⁽¹⁾

124.004 ⁽¹⁾

124.019

10,5

124.020

124.021

124.023 ⁽¹⁾

124.040

124.041

124.043 ⁽¹⁾

124.079

124.080

124.081

124.083 ⁽¹⁾

124.10

124.120

124.125

124.130

124.185

124.190

107

124.003 ⁽²⁾

124.004 ⁽²⁾

19.4

124.007

124.022

124.023 ⁽²⁾

124.026

124.027

124.028

124.030

124.031

124.042

124.043 ⁽²⁾

124.050

124.051

124.082

124.083 ⁽²⁾

124.088

124.090

124.091

124.127

124.128

124.133

124.188

124.193

124.2

124.3

201.028

201.029

201.034

201.035

201.128

124.034 ⁽³⁾

124.036 ⁽⁷⁾

126

25.4

129.06

140.03 ⁽⁵⁾

140.1 ⁽⁵⁾

201.036

124.008

124.029

124.032

124.034 ⁽⁴⁾

22.4

124.052

124.092

124.036 ⁽⁸⁾

140 ⁽⁶⁾

27.4

129.07

28.5

201.018

201.022

201.023

201.024

9.5

201.122

201.126

⁽¹⁾	⁽¹⁾ Installed up to 06/88

⁽²⁾	⁽²⁾ Installed as of 07/88 Installed up to 09/92, --> MY 92

⁽³⁾

⁽³⁾ MY 93

⁽⁴⁾	⁽⁴⁾ Installed as of 10/92,

⁽⁵⁾	⁽⁵⁾ With two-piston fixed caliper

⁽⁶⁾	⁽⁶⁾ With four-piston fixed caliper

⁽⁷⁾	⁽⁷⁾ Installed up to 10/92

⁽⁸⁾	⁽⁸⁾ Installed as of 11/92

TEST VALUES FOR REAR BRAKE PADS IN MM

Model				Brake disc thickness	Wear limit	Limit for maintenance service
107	126			10	8.3	8.6
124.003	124.004	124.007	124.01	9	7.3	7.6
124.02	124.030	124.031	124.032
124.04	124.05	124.06	124.07
124.08	124.090	124.1	124.2
124.3	129.06	201
124.008	124.091	124.092		20	17.4	18
124.034	124.036			24	21.4	22
129.07	140.04	140.05		22	19.4	20
140.02	140.03	140.1		12	9.8	10.5

Special tools

Fig 4: Identifying Special Tools (124 589 05 19 00 42)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 201 up to 12.1984

Fig 5: [Cleaning Spring Strut And Brake Carrier Mount]

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 6: Measuring Brake Disc Thickness

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 7: Locating Wear Limit Of Brake Discs

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Lining thickness on front brake pads (43)	check (item 1). For this purpose position measuring instrument on hex. head bolts for spring strut and brake carrier mount on steering knuckle. The contact surfaces must be clean.
	NOTE: If measurement of the brake linings indicates that the brake pads on the front brakes must be replaced, perform the work described below in addition at extra charge.
Brake disc thickness	measure with veneer gauge (035) (arrow).
	NOTE: Observe the wear limits for the brake discs under all circumstances. This ensures that the wear limit will not be exceeded before the next maintenance service, observe limits (see table).
Brake discs (61)	check for contamination.
	NOTE: Clean highly contaminated brake discs - visible on grey or blue discoloration of brake surfaces - with cleaning pads at extra charge (RI 42-0260).
Brake discs (61)	check for cracking and scoring.
	NOTE: It is not necessary to replace ventilated brake discs with hairline cracks up to 25 mm long, which can result from high stress. Replace brake discs with gaping cracks and scoring deeper than 0.5 mm immediately. (RI 42-0220, 42-0228).
Rear brake pads	check for wear.
	NOTE: The brake pads must be replaced when the distance between the eye of the pad backing plate and the cross spring is approx. 3 mm.
Dust caps and operation of pistons in brake calipers	check.

TEST VALUES FOR BRAKE PADS IN MM

Model		201.02 201.1	201.03
Thickness of brake pad (pad backing plate and lining)	front	17.5	18.5
Thickness of brake pad (pad backing plate and lining)	rear	13.5	15.5
Permissible brake pad wear down to lining thickness of		2	2
Permissible brake pad wear down to lining thickness of		2	2

TEST VALUES FOR BRAKE DISCS IN MM

Model		Brake disc thickness		Wear limit		Limit for maintenance service
Model		Front	Rear	Front	Rear	Front	Rear
201.02	201.1	11	9	9	7.3	9.5	7.6
201.03		22	9	19.4	7.3	20	7.6

Special tool

Fig 8: Identifying Special Tools (201 589 00 19 00 P)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Check brake pad thickness. Press measuring instrument against steering knuckle. Position long pin against pad backing plate on inner lining and short pin against head of hex. head bolt for fastening cylinder housing - brake carrier.

Remove measuring instrument and read off brake lining wear on measuring pins. If less than six measuring rings are visible, more than approx. 6 mm are worn off of the total lining thickness of 12 mm on model 201.02/1 and 13 mm on model 201.03.

In such cases we recommend replacing the brake pads unless the customer desires to completely utilize the remaining lining until the wear indicator lamp comes on.

NOTE: The wear of the outer lining is measured with the short pin and of the inner lining with the long pin.