Checking brake booster - AR43.10-P-0325P
MODELS 203
 |
Check |
|
|
| 1 |
Operate brake pedal several times until vacuum in brake booster (16) is reduced |
|
|
| 2 |
Connect tester (030) to brake booster |
Test connection (031) for testing the check valve (17) or brake booster (16). |
AR43.10-P-0024-01P |
| |
|
Vacuum tester |
Figure |
| |
|
Test connection |
Figure |
| |
|
Test values for brake booster |
*BE43.10-P-1001-01A |
| |
|
Test values for brake booster |
*BE43.10-P-1002-01A |
| 3 |
Connect pressure tester (051) with connection fitting to brake caliper |
Pressure tester |
*WH58.30-Z-1012-15A |
| |
|
Test connection |
Figure |
| |
|
Front axle bleed screw |
*BA42.10-P-1002-03A |
| |
|
Rear axle bleed screw |
*BA42.10-P-1002-01A |
| 4 |
Attach pedal force meter (060) to brake pedal |
|
*WE58.40-Z-1003-19A |
| 5 |
Start engine and create a vacuum of 0.75 to 0.80 bar by accelerating and then suddenly releasing the accelerator pedal |
If only a substantially lower vacuum is attained, or if the vacuum immediately falls away,
the gasket between the brake booster and the master brake cylinder may be damaged or the check valve in the vacuum line may be defective: ↓ |
|
| |
|
Check the check valve |
AR43.10-P-0023P |
| |
|
Removing and installing master brake cylinder, replacing gasket |
AR42.10-P-0310P |
| 6 |
Apply specified force to the brake pedal and read line pressure |
To cover measurement errors as far as possible (wrong force on brake pedal, wrong vacuum) and measurement scatter of the gauges, a tolerance of ± 10 bar on the specified value is permissible.
The measured value must be within the value range. |
*BE43.10-P-1003-01A |
| 7 |
Disconnect tester (030) from brake booster |
Vacuum tester |
Figure |
| |
|
Test connection |
Figure |
| 8 |
Disconnect pressure tester (051) with connection fitting from brake caliper |
Pressure tester |
*WH58.30-Z-1012-15A |
| |
|
Test connection |
Figure |
| 9 |
Remove pedal force meter (060) from brake pedal |
|
*WE58.40-Z-1003-19A |
| 10 |
Bleed brake system |
After checking, only bleed the brake caliper to which the pressure tester was connected. |
AR42.10-P-0010P |
TEST VALUES FOR PNEUMATIC BRAKE BOOSTER
| Number |
Designation |
Models 203.004/006/035/045 |
Models 203.016/061/064/076/081/084/087/092/261/276/281/284/287/292 |
| BE43.10-P-1001-01A |
Brake booster dia. ø |
|
|
|
mm |
177,8/203 |
177,8/203 |
| inch |
7/8 |
7/8 |
| BE43.10-P-1002-01A |
Boost factor |
≈ 5,6 |
≈ 5,6 |
| BE43.10-P-1003-01A |
Brake line pressure |
Intake manifold vacuum 0.75-0.8 bar |
Force on brake pedal |
50 N |
bar |
8,5...13 |
7,5...11,5 |
| 100 N |
bar |
28,5...35 |
25...31 |
| 150 N |
bar |
48,5...5,7 |
42,5...50 |
| 200N |
bar |
68...80 |
59,5...70 |
| 250N |
bar |
84,5...100 |
74...87 |
FRONT AXLE FLOATING CALIPER
| Number |
Designation |
Model 203 except 203.018/065/076/218/265/276/718 |
| BA42.10-P-1002-03A |
Bleed screw at front axle floating caliper |
Nm |
7 |
FIXED CALIPER AT REAR
| Number |
Designation |
Model 203 except model 203.076/276 |
Models 203.076/276 Models 209.376/476 up to 23.4.04 (2-piston fixed brake caliper) |
| BA42.10-P-1002-01A |
Bleed screw on rear axle fixed brake caliper |
Nm |
7 |
7 |
COMMERCIALLY AVAILABLE TOOLS
| Number |
Designation |
| WH58.30-Z-1012-15A |
Pressure tester (hydraulic single / dual circuit brake systems) |
WORKSHOP EQUIPMENT
| WE58.40-Z-1003-19A |
Pedal force meter |