Contents: General parameters ↡ Front wheel brakes ↡ Rear wheel brakes ↡ Master brake cylinder ↡ Hydraulic drive ↡ Vacuum brake booster ↡ Tightening force of threaded…↡
Note: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold.
General parameters
| Design | Hydraulic, dual-circuit with vacuum booster. Electronic anti-skid system (stability stabilization - ESP), Brake Assist (BAS) and Anti-lock Brake System (ABS) |
| Braking mechanisms | Disk |
| Brake discs | Made of composite material aluminum + steel, ventilated on the front wheels, solid with perforation on the rear wheels |
| Parking brake foot, pedal operated | |
Front wheel brakes
| Thickness of friction linings of rear brake pads, mm | |
| Models 140.032/033 to 12.91, 140.134 to 12.91 and 140.135 | |
| New pads | 18.5 |
| Permissible wear | |
| Without taking into account the substrate | 2 |
| Taking into account the substrate (for maintenance) | 13 |
| Wear indicator activation | 2.5 |
| Models 140.134 to 12.91 | |
| New pads | 28 |
| Permissible wear taking into account the substrate | 25.4 |
| Permissible wear for maintenance | 26 |
| Models 140.28/042/043/050/051/056/057/ 063/070/076/135, 140.032/033 from 01.92 and 140.134 from 01.92 | |
| New pads | 19.3 |
| Permissible wear | |
| Without taking into account the substrate | 2 |
| Taking into account the substrate (for maintenance) | 13 |
| Wear indicator activation | 2.5 |
| Models 140.028/032/033/134/135 and 140.042/043/050/051/056/057/063/070/076 | |
| New pads | 15.5 |
| Permissible wear | |
| Without taking into account the substrate | 2 |
| Taking into account the substrate (for maintenance) | 11 |
| Wear indicator activation | 2.5 |
| Dimensions of front brake discs, mm | |
| Minimum allowable thickness | 25.4 (since 91 27.4) |
| Models 140.134, 140.028/042/043/050/051/056/076/135 and 140.032/033 from 01.92 | |
| Thickness of the new disc | 30 |
| Permissible disc wear | 27.4 |
| Permissible wear for maintenance | 28 |
| Models 140.032/033 from 01.92 | |
| Thickness of the new disc | 28 |
| Permissible disc wear | 25.4 |
| Permissible wear for maintenance | 26 |
| Dimensional characteristics of brake mechanism components | |
| Diameter of the new caliper body, mm | |
| 2-piston design caliper (models 140.03/1 to 12.91 (ATE 57) | 56.99-57.04 |
| 4-piston design caliper | |
| Models 140.02/04/05/06/07 (Girling/Lucas diameter 40/44) | 39.98 - 40.03 |
| Models 140.03/1 from 01.92 (Girling/Lucas diameter 40/44) | 39.98 - 40.03 |
| Width, mm | |
| 2-piston design caliper (models 140.03/1 to 12.91 (ATE 57) | 90 + 0.2 |
| 4-piston design caliper | |
| Models 140.02/04/05/06/07 (Girling/Lucas diameter 40/44) | 43.98 - 44.03 |
| Models 140.03/1 from 01.92 (Girling/Lucas diameter 40/44) | 43.98 - 44.03 |
| Brake disc diameter, mm | |
| 2-piston design caliper (models 140.03/1 to 12.91 (ATE 57) | 310 |
| 4-piston design caliper | |
| Models 140.02/04/05/06/07 (Girling/Lucas diameter 40/44) | 100 + 0.2 |
| Models 140.03/1 from 01.92 (Girling/Lucas diameter 40/44) | 100 + 0.2 |
| Brake disc thickness, mm | |
| 2-piston design caliper (models 140.03/1 to 12.91 (ATE 57) | 28 |
Rear wheel brakes
| Minimum permissible diameter of brake drums, mm | 160.2 |
Dimensions of rear brake discs, mm
| Minimum allowable thickness | |
| For 90 years of production. | 8.3 |
| Since 1991. | |
| Whole | 9.8 |
| Ventilated | 19.4 |
| Models 140.028/032/033, 140.134/135 | |
| Thickness of the new disc | 12 |
| Permissible disc wear | 9.8 |
| Permissible wear for maintenance | 10.5 |
| Models 140.042/043/050/051/056, 140.057/063/070/076 | |
| Thickness of the new disc | 22 |
| Permissible disc wear | 19.4 |
| Permissible wear for maintenance | 20 |
Master brake cylinder
| Diameter of the GTZ pusher piston, mm | 25.4 |
| Diameter of the floating piston of the master cylinder, mm | 19.05 |
| Displacement of the pushing piston in the master cylinder, mm | 17 |
| Floating piston displacement in the master cylinder, mm | 15 |
Hydraulic drive
| Dependence of hydraulic pressure on the force applied to the foot brake pedal (at a pressure in the intake manifold of 0.75-0.8 bar), bar | |
| 100 N | |
| Models 140.02/03/1 (ATE T52 4A 225 210 or Lucas LSC 115) | 35-45 |
| Models 140.04/05/06/07 (ATE T52/ 4A 255 225) | 35-47 |
| 150 N | |
| Models 140.02/03/1 (ATE T52 4A 225 210 or Lucas LSC 115) | 53- 63 |
| Models 140.04/05/06/07 (ATE T52/ 4A 255 225) 57-69 | |
| 200 N | |
| Models 140.02/03/1 (ATE T52 4A 225 210 or Lucas LSC 115) | 71 -81 |
| Models 140.04/05/06/07 (ATE T52/ 4A 255 225) | 78 -92 |
| 250 N | |
| Models 140.02/03/1 (ATE T52 4A 225 210 or Lucas LSC 115) | 87-98 |
| Models 140.04/05/06/07 (ATE T52/ 4A 255 225) | 95- 105 |
Vacuum brake booster
| Vacuum booster diameter, mm | |
| Models 140.02/03/1 (ATE T52/4A 225 210 or Lucas LSC 115) | 203/228.6 |
| Models 140.04/05/06/07 (ATE T52/4A 255 225) | 228.6/254 |
| Gain factor | |
| Models 140.02/03/1 (ATE T52/4A 225 210 or Lucas LSC 115) | 5.6 |
| Models 140.04/05/06/07 (ATE T52/4A 255 225) | 6.85 |
Tightening force of threaded connections, Nm
Tightening torques for fasteners are also given in the text of the Chapter and in some illustrations*.
* Tightening torques highlighted in bold in the text must be strictly observed; efforts not shown in bold are only approximate.
| Rear hub | 320 |
| Front caliper to holder | 35 |
| Rear Caliper to Holder (TDI) | 115 |
| Caliper holder to the fist | |
| Front wheels | 115 |
| Rear wheels | |
| Until 07.93 | 115 |
| After 08.93 | 50 |
| Vacuum tube to vacuum booster | 30 |
| Vacuum booster mounting nut to the bracket | 20 |
| Brake hose to brake pipe | 14 |
| Brake hose to brake caliper | 18 |
| Frequency sensor mounting bolt front wheel rotation | 22 |
| Frequency sensor mounting bolt rear wheel rotation | 8 |
| Tie rod end nuts | |
| S280, S320, S300 TDI | 50 |
| S420, S500, S600 | 55 |
| Wheel bolts | |
| S280, S320, S420, S500, S600 | 150 |
| S300 TDI | 110 |