Test Brake System With Pressure Tester For Leaks - AR42.10-P-0015LWO
Model 238
| 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 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 | Notes on externally invisible brake fluid loss | AH42.10-P-9406-02A | |
| Notice | Brake fluid notes | AH42.50-P-0001-01A | |
| Notice | Notes on repairs to brake system | AH42.00-P-0003-01A | |
| Check | |||
| 1 | Remove cover over brake fluid reservoir (1) | ||
| 2 | Clean area around cap of brake fluid reservoir (1) | Assembly cleaner | *BR00.45-Z-1028-04A |
| 3 | Unscrew cap of brake fluid reservoir (1) | ||
| 4 | Connect filling unit to brake fluid reservoir (1) | ||
| 000 588 01 82 00 Filling unit | WS25.00-P-0016B | ||
| Brake fluids (DOT 4 plus) | BB00.40-P-0331-00A | ||
| General brake fluid | BB00.40-P-0330-01A | ||
| 5 | Raise vehicle | AR00.60-P-1002LWG | |
| 6 | Remove bleed screw from left front brake caliper (2) and connect test equipment (3) | ||
| 000 588 07 21 00 Test equipment | Test equipment (3) for hydraulic oil systems may not be used for systems with brake fluid. Otherwise the brake fluid will be mixed with mineral oil, which can cause brake failure. |
WS42.00-P-0014B | |
| 7 | Vent test equipment (3) | ||
| 8 | Lower vehicle | AR00.60-P-1002LWG | |
| 9 | Start engine and run | ||
| 10 | Depress brake pedal and insert brake pedal jack (4) with adapter between brake pedal and driver's seat | ||
| Fig 1 | |||
| Fig 2 | |||
| 11 | Read off and note brake pressure on high- pressure gauge of test equipment (3) | ||
| 12 | Read off brake pressure again after the specified test period on the test equipment's (3) high-pressure manometer and compare against previously-noted value | If brake-pressure loss is too high ↓ Determine cause and repair brake system. |
*BE42.10-P-1001-19A |
| 13 | Switch off engine and remove brake pedal jack (4) with adapter | ||
| 14 | Reduce vacuum in BAS brake booster (A7/7) by depressing brake pedal several times | ||
| 15 | Depress brake pedal and insert brake pedal jack (4) with adapter between brake pedal and driver's seat | Fig 1 | |
| Fig 2 | |||
| 16 | Slowly turn back brake pedal jack (4) until test equipment's (3) low-pressure manometer displays the specified brake pressure | *BE42.10-P-1001-19A | |
| 17 | Read off brake pressure after specified test period on test equipments (3) low-pressure manometer | In event of brake pressure loss ↓ Determine leakage in brake system and repair brake system. |
*BE42.10-P-1001-19A |
| 18 | Remove brake pedal jack (4) and adapter | ||
| 19 | Raise vehicle | AR00.60-P-1002LWG | |
| 20 | Disconnect test equipment (3) from brake caliper (2) and screw bleed screw all the way into brake caliper (2) | ||
| 21 | Vent left front brake caliper (2) | AR42.10-P-0010-02LWE | |
| *BA42.10-P-1003-10X | |||
| 22 | Disconnect filling unit from brake fluid reservoir (1) | ||
| 23 | Lower vehicle | AR00.60-P-1002LWG | |
| 24 | Correct fluid level in brake fluid reservoir (1) | ||
| AP42.10-P-4210B | |||
| 25 | Seal brake fluid reservoir (1) with cap | ||
| 26 | Install cover over brake fluid reservoir (1) |
HYDRAULIC BRAKE SYSTEM
| Number | Designation | Model 238 | |||
|---|---|---|---|---|---|
| BE42.10-P-1001-19A | Check values for leak test | High-pressure test | Test period | min | 5 |
| Brake pressure loss | % | 5 | |||
| Low-pressure test | Brake pressure | bar | 3 | ||
| Test period | min | 2 | |||
| Brake pressure loss | bar | 0 | |||
FRONT AXLE BRAKE CALIPER
| Number | Designation | Model 238 (except 238.361/461) | Model 238.361/461 | |
|---|---|---|---|---|
| BA42.10-P-1003-10X | Bleed screw at brake caliper | Nm | 14 | 14 |
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | A 000 986 56 01 |