Checking Brake Booster - AR43.10-P-0325XG
Model 463
as of model year 2019
| 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 | |
| Brake fluid notes | AH42.50-P-0001-01A | ||
| Notes on repairs to brake system | AH42.00-P-0003-01A | ||
| Check | |||
| 1 | Open hood. | AR88.40-P-1000XG | |
| 2 | Clean area surrounding cap on 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. |
|
| 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 BAS brake booster (A7/7) by depressing brake pedal several times. | ||
| 6 | Connect vacuum tester (030) and test connection (031) to BAS brake booster (A7/7). | Observe manufacturer's operating instructions. Otherwise measurement errors can occur. |
AR43.10-P-0024-01V |
| Fig 2 | |||
| Fig 3 | |||
| 7 | Remove vent screw at front brake caliper on the 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. | Brake line pressure | *BE43.10-P-1004-01B |
| If the specified vacuum is not generated. ↓ Switch off engine and check the check valve (17) for pressure loss. |
AR43.10-P-0023XG | ||
| 11 | Replace seal between BAS brake booster (A7/7) 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-0300XG |
| 12 | Apply the specified force to the brake pedal and read off the line pressure on the test equipment (051). | Brake line pressure | *BE43.10-P-1004-01B |
| If the specified line pressure is not built up. ↓ Replace BAS brake booster (A7/7). |
AR43.10-P-0350XG | ||
| 13 | Switch off engine. | ||
| 14 | Remove pedal force meter (060) from brake pedal. | ||
| 15 | Disconnect vacuum tester (030) with test connection (031) from BAS brake booster (A7/7). | AR43.10-P-0024-01V | |
| 16 | Disconnect test equipment (051) with connection fitting. | ||
| 17 | Screw in vent screw at front brake caliper on the driver's side. | ||
| 18 | Bleed brake caliper on the driver's side. | AR42.10-P-0010XG | |
| *BA42.10-P-1001-02B | |||
| 19 | Disconnect filling unit from brake fluid reservoir. | ||
| 20 | Seal brake fluid reservoir using cap. |
CHECK VALUES FOR PNEUMATIC BRAKE BOOSTER
| Number | Designation | Model 463 up to model year 2019 | Model 463 as of model year 2019 | ||||
|---|---|---|---|---|---|---|---|
| BE43.10-P-1004-01B | Brake line pressure | Intake manifold vacuum 0.67-0.8 bar | Force on brake pedal | 50 N | bar | - | 26...32 |
| 100 N | bar | - | 52...60 | ||||
| 150 N | bar | - | 68...82 | ||||
| 200 N | bar | - | 70...85 | ||||
| 250 N | bar | - | 73...87 | ||||
FRONT AXLE FIXED BRAKE CALIPER
| Number | Designation | Model 461 (except 461.339) Model 463 up to model year 2019 | |
|---|---|---|---|
| BA42.10-P-1001-02B | Bleed screw at front axle fixed brake caliper | Nm | 14 |