Checking Brake Booster - AR43.10-P-0325ME
Model 167
MODIFICATION NOTES
| 14.08.2019 | New operation step added. | Operation step 21 |
| Risk of burn injuries , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust. | Wear protective clothing and safety glasses. Use the extraction system. Move people out of the danger zone. | AS49.00-Z-0001-01A | |
| Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | AS00.00-Z-0005-01A | |
| 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 poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid | Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid. | AS42.50-Z-0001-01A | |
| Notice | Brake fluid notes | AH42.50-P-0001-01A | |
| Notice | Notes on repairs to brake system | AH42.00-P-0003-01A | |
| Notes on safety-relevant components | AH00.00-Z-0019-01A | ||
| Check | |||
| 1 | Remove cover above left suspension strut tower. | AR83.10-P-1411ME | |
| 2 | Clean area surrounding cap at brake fluid reservoir. | Before opening, clean areas surrounding cap thoroughly. Otherwise minute dirt particles in the hydraulic components cause malfunctions and total failure of the brake system. |
|
| Assembly cleaner | *BR00.45-Z-1028-04A | ||
| 3 | Open cap on brake fluid reservoir. | ||
| 4 | Connect filling unit to brake fluid reservoir. | ||
| 000 588 01 82 00 Filling unit | WS25.00-P-0016B | ||
| General brake fluid | BB00.40-P-0330-01A | ||
| Brake fluids (DOT 4 plus) | BB00.40-P-0331-00A | ||
| 5 | Reduce vacuum in brake booster (9) by depressing brake pedal several times. | ||
| 6 | Connect vacuum tester (030) and test connection (031) to brake booster (9). | Observe manufacturer's operating instructions Otherwise measurement errors can occur. |
AR43.10-P-0024-01ME |
| Fig 2 | |||
| Fig 1 | |||
| 7 | Unscrew vent screw at front brake caliper on driver's side and connect test equipment (051). | ||
| 000 588 07 21 00 Test equipment | Use correct connection fitting (pitch, centering cone, etc.). Leaks and measurement errors can otherwise occur. |
WS42.00-P-0014B | |
| 8 | Bleed test equipment (051). | ||
| 9 | Connect pedal force meter (060) at brake pedal. | Pedal force meter (060) |
|
| 10 | Start the engine and generate specified vacuum. | If the specified vacuum is not generated. ↓ Switch off engine and check check valve (17) for pressure loss. |
*BE43.10-P-1002-01E |
| AR43.10-P-0023ME | |||
| 11 | Replace seal between brake booster (9) and master brake cylinder. | If the specified vacuum has not been built up or falls immediately and the check valve (17) is not defective. | |
| AR42.10-P-0300ME | |||
| 12 | Apply specified force to brake pedal and read off line pressure on test equipment (051). | If the specified line pressure is not built up. ↓ Replace brake booster (9). |
*BE43.10-P-1002-01E |
| AR43.10-P-0350ME | |||
| 13 | Switch off engine. | ||
| 14 | Remove pedal force meter (060) from brake pedal. | Pedal force meter (060) |
|
| 15 | Disconnect vacuum tester (030) with test connection (031) from brake booster (9). | AR43.10-P-0024-01ME | |
| Fig 2 | |||
| Fig 1 | |||
| 16 | Disconnect test equipment (051) with connection fitting. | ||
| 17 | Screw in vent screw at front brake caliper on driver's side. | ||
| 18 | Bleed brake caliper on the driver's side. | AR42.10-P-0010ME | |
| *BA42.10-P-1001-10L | |||
| 19 | Disconnect filling unit from brake fluid reservoir. | ||
| 20 | Seal brake fluid reservoir using cap. | ||
| 21 | Install cover over left suspension strut tower. | AR83.10-P-1411ME |
CHECK VALUES FOR PNEUMATIC BRAKE BOOSTER
| Number | Designation | Model 167 | ||||
|---|---|---|---|---|---|---|
| BE43.10-P-1002-01E | Brake line pressure | Intake manifold vacuum 0.75...0.8 bar | Force on brake pedal | 50 N | bar | 21, 5...27, 5 |
| 100 N | bar | 45, 5...52, 5 | ||||
| 150 N | bar | 70...78 | ||||
| 200 N | bar | 78...90 | ||||
| 250 N | bar | 81...93 | ||||
FRONT AXLE BRAKE CALIPER
| Number | Designation | Model 167 | |
|---|---|---|---|
| BA42.10-P-1001-10L | Bleed screw at brake caliper | Nm | 18 |
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | A 000 986 56 01 |