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

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

Change: text revised

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.

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	16	18,5	19,3	17,9
Limit for maintenance service (pad backing plate and lining)	12	14	11	13	13	13
Permissible brake lining wear down to lining thickness of	2	2	2	2	2	2
(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.

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

Model				Brake disc thickness	Wear limit	Limit for maintenance service
124.003 (1)		124.004 (1)	124.019	12	10	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)	22	19.4	20
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	28	25.4	26
129.06
140.03 (5)	140.1 (5)	201.036
124.008	124.029	124.032	124.034 (4)	25	22.4	23
124.052	124.092
124.036 (8)	140 (6)			30	27.4	28
129.07				30	28	28.5
201.018	201.022	201.023	201.024	11	9	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

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 

Model 201 up to 12.1984 

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.

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

Model		Brake disc thickness		Wear limit		Limit for maintenance service
		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 

1. 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.