Checking Brake Booster - AR43.10-P-0325FR
Model 257
Model 290
Shown on model 257
Shown on model 257
| 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 | |
| Topical note | Brake fluid notes | AH42.50-P-0001-01A | |
| Notes on safety-relevant components | AH00.00-Z-0019-01A | ||
| Remove | |||
| 1 | Remove wiper arms. | AR82.30-P-6100FR | |
| 2 | Remove cover (1) on driver's side. | ||
| 3 | Remove air/water duct. | ||
| 4 | Remove strut (2). | ||
| 5 | Remove front wheel on driver's side. | AR40.10-P-1102A | |
| 6 | Clean area surrounding cap at brake fluid reservoir. | Before opening, clean the area 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. | ||
| Check | |||
| 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 | |
| 8 | 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 | ||
| 9 | Remove vacuum in BAS brake booster (A7/7) by depressing brake pedal several times. | ||
| 10 | Connect vacuum tester (4) with test connection (5) at BAS brake booster (A7/7). | AR43.10-P-0024-01FR | |
| Fig 1 | |||
| Fig 2 | |||
| 11 | Remove vent screw from front brake caliper on the driver's side and connect test equipment (7). | ||
| 000 588 07 21 00 Test equipment | WS42.00-P-0014B | ||
Use correct connection fitting (pitch, centering cone, etc.). Leaks and measurement errors can otherwise occur. |
|||
| 12 | Bleed test equipment (7). | ||
| 13 | Connect pedal force meter (8) at brake pedal. | Pedal force meter (8) |
|
| 14 | Start the engine and generate specified vacuum. | ||
| Brake line pressure If there is a problem, ↓ Switch off engine and check check valve (6). |
*BE43.10-P-1004-01G | ||
| AR43.10-P-0023FR | |||
| 15 | 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-0300FR | |||
| 16 | Apply specified force to brake pedal and read off line pressure on test equipment (7). | Brake line pressure If there is a problem, ↓ Replace BAS brake booster (A7/7). |
*BE43.10-P-1004-01G |
| AR43.10-P-0350FR | |||
| 17 | Switch off engine. | ||
| 18 | Remove pedal force meter (8) from brake pedal. | ||
| 19 | Remove vacuum in BAS brake booster (A7/7) by depressing brake pedal several times. | ||
| 20 | Disconnect vacuum tester (4) with test connection (5) from BAS brake booster (A7/7) | AR43.10-P-0024-01FR | |
| 21 | Disconnect test equipment (7) with connection fitting and screw in vent screw all the way at brake caliper on the driver's side. | ||
| 22 | Bleed brake caliper on the driver's side. | AR42.10-P-0010-02FR | |
| *BA42.10-P-1003-10BA | |||
| *BA42.10-P-1003-10X | |||
| 23 | Disconnect filling unit from brake fluid reservoir. | ||
| 24 | Check and correct fluid level in brake fluid reservoir. | ||
| AP42.10-P-4210B | |||
| 25 | Seal brake fluid reservoir using cap. | ||
| Install | |||
| 26 | Attach front wheel on driver's side. | AR40.10-P-1102A | |
| 27 | Install support (2). | *BA62.30-P-1003-02K | |
| *BA62.30-P-1004-02K | |||
| 28 | Install air/water duct. | ||
| 29 | Install driver's side cover (1). | ||
| 30 | Install wiper arms. | AR82.30-P-6100FR |
CHECK VALUES FOR PNEUMATIC BRAKE BOOSTER
| Number | Designation | Model 257 | Model 290 | ||||
|---|---|---|---|---|---|---|---|
| BE43.10-P-1004-01G | Brake line pressure | Vacuum 0.92...0.98 bar | Force on brake pedal | 50 N | bar | 22 | 22 |
| 100 N | bar | 41 | 49 | ||||
| 150 N | bar | 61 | 75 | ||||
| 200 N | bar | 80 | 85 | ||||
| 250 N | bar | 100 | 87 | ||||
FRONT AXLE BRAKE CALIPER
| Number | Designation | Model 290 | |
|---|---|---|---|
| BA42.10-P-1003-10BA | Bleed screw at brake caliper | Nm | 14 |
FRONT AXLE BRAKE CALIPER
| Number | Designation | Model 257 (except 257.361) | Model 257.361 | |
|---|---|---|---|---|
| BA42.10-P-1003-10X | Bleed screw at brake caliper | Nm | 14 | 14 |
FROND END WITH FRONT REINFORCEMENT
| Number | Designation | Model 257 | Model 290 | |
|---|---|---|---|---|
| BA62.30-P-1003-02K | Screw/bolt, lower strut to suspension strut tower mounting bracket | Nm | 50 | 50 |
FROND END WITH FRONT REINFORCEMENT
| Number | Designation | Model 257 | Model 290 | |
|---|---|---|---|---|
| BA62.30-P-1004-02K | Screw/bolt, lower strut to firewall | Nm | 23 | 23 |
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | A 000 986 56 01 |