Checking Brake Booster - AR43.10-P-0325LWO
Model 238
| 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 | |
| Remove | |||
| 1 | Remove both wiper arms | AR82.30-P-6100LW | |
| 2 | Remove cover (1) on the driver side | ||
| 3 | Remove cover (1) on the passenger side | ||
| 4 | Remove air-water-duct under the wiper arms | ||
| 5 | Remove strut (2) | ||
| 6 | Clean area surrounding cap on brake fluid reservoir | Before opening, clean the areas surrounding the cap thoroughly. Otherwise particles of dirt in the hydraulic components can result in malfunctions and total failure of the brake system. Assembly cleaner |
*BR00.45-Z-1028-04A |
| 7 | Unscrew cap from brake fluid reservoir | ||
| 8 | Remove front wheel on the driver side | AR40.10-P-1102A | |
| Check | |||
| 9 | 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 | ||
| 10 | Reduce vacuum in BAS brake booster (A7/7) by depressing brake pedal several times | ||
| 11 | Connect vacuum tester (4) with test connection (5) to BAS brake booster (A7/7) | AR43.10-P-0024-01LWO | |
| Fig 2 | |||
| Fig 1 | |||
| 12 | Unscrew vent screw from front brake caliper on the driver side and connect test equipment (7) | ||
| 000 588 07 21 00 Test equipment | Use correct connection fitting (pitch, cone etc.). Leaks and measurement errors can otherwise occur. |
WS42.00-P-0014B | |
| 13 | Bleed test equipment (7) | ||
| 14 | Connect pedal force meter (8) to brake pedal | Pedal force meter (8) |
|
| 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 | |
| 15 | Start the engine and generate specified vacuum | If the specified vacuum is not reached ↓ Switch off engine and check the check valve (6). |
*BE43.10-P-1004-01G |
| AR43.10-P-0023LW | |||
| 16 | Replace seal between BAS brake booster (A7/7) and master brake cylinder | If the specified vacuum has not been reached or if it drops off straight away and the check valve (6) is not defective. | AR42.10-P-0300LWO |
| 17 | Apply the specified force to the brake pedal and read off the line pressure on the test equipment (7) | If line pressure is not reached ↓ Replace BAS brake booster (A7/7). |
*BE43.10-P-1004-01G |
| AR43.10-P-0350LWO | |||
| 18 | Turn off engine | ||
| 19 | Remove pedal force meter (8) from brake pedal | ||
| 20 | Disconnect vacuum tester (4) with test connection (5) from BAS brake booster (A7/7) | AR43.10-P-0024-01LWO | |
| 21 | Disconnect test equipment (7) with connection fitting and screw in vent screw at brake caliper on the driver side all the way | ||
| 22 | Bleed brake caliper on the driver side | AR42.10-P-0010-02LWE | |
| *BA42.10-P-1003-10X | |||
| 23 | Disconnect filling unit from brake fluid reservoir | ||
| 24 | Check and correct fluid level in the brake fluid reservoir | ||
| AP42.10-P-4210B | |||
| Install | |||
| 25 | Mount front wheel on the driver side | AR40.10-P-1102A | |
| 26 | Seal brake fluid reservoir using cap | ||
| 27 | Install strut (2) | *BA62.30-P-1003-02K | |
| *BA62.30-P-1004-02K | |||
| 28 | Install air-water-duct under the wiper arms | ||
| 29 | Install cover (1) on the passenger side | ||
| 30 | Install cover (1) on the driver side | ||
| 31 | Install both wiper arms | AR82.30-P-6100LW |
CHECK VALUES FOR PNEUMATIC BRAKE BOOSTER
| Number | Designation | Model 238 | ||||
|---|---|---|---|---|---|---|
| BE43.10-P-1004-01G | Brake line pressure | Vacuum 0.92...0.98 bar | Force on brake pedal | 50 N | bar | 22 |
| 100 N | bar | 41 | ||||
| 150 N | bar | 61 | ||||
| 200 N | bar | 80 | ||||
| 250 N | bar | 100 | ||||
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 |
FROND END WITH FRONT REINFORCEMENT
| Number | Designation | Model 238 | |
|---|---|---|---|
| BA62.30-P-1003-02K | Screw/bolt, lower strut to suspension strut tower mounting bracket | Nm | 50 |
FROND END WITH FRONT REINFORCEMENT
| Number | Designation | Model 238 | |
|---|---|---|---|
| BA62.30-P-1004-02K | Screw/bolt, lower strut to firewall | Nm | 23 |
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | A 000 986 56 01 |