Leon Mk1
| Brake servo/brake master cylinder - general overview |
Note| The master brake cylinder and the servo brake can be replaced independently |
| 1 - | Brake servo: |
| q | In petrol engines, the necessary vacuum is taken from the intake manifold |
| q | In diesel engines the vacuum is obtained by a fitted vacuum pump |
| q | Operating test: |
| – | With engine off, press the brake pedal hard several times (this reduces the existing vacuum in the servo brake). |
| – | Next, keep the brake pedal depressed halfway and start engine. If the brake servo is working correctly the brake pedal will give way notably (the brake servo effect is beginning) |
| q | If faulty, replace completely. |
| q | Non return valve (in the vacuum hose) |
| – | Operating test: → Chapter |
| q | Separating from the brake pedal → Chapter |
| q | removing and fitting → Chapter. |
| q | Allocation → Spare parts catalogue |
| 2 - | Brake fluid level warning contact -F34- |
| q | This cannot be removed |
| 3 - | Plugs |
| 4 - | Brake fluid deposit |
| q | Removing |
| – | Remove the brake fluid using an extraction bottle. |
| – | Remove the return hose for the clutch master cylinder and uncouple the connector for the brake fluid level warning contact. |
| – | Extract the support pin → Item for the lateral hooks of the brake fluid tank. |
| – | Remove the brake fluid reservoir by pulling it upwards. |
| – | Bleed brake system → Chapter. |
| q | Installation: |
| Installation is carried out in reverse order. |
| 5 - | Union plug |
| q | Impregnate with brake fluid and introduce into the master cylinder |
| 6 - | 20 Nm |
| q | Replace after each removal |
| 7 - | Brake master cylinder |
| q | Cannot be repaired. If faulty, completely replace |
| q | Checking for leaks → Chapter |
| q | removing and fitting → Chapter. |
| 8 - | Security spring |
| q | Insert through the master cylinder |
| 9 - | Seal |
| q | Replace after each removal |
| 10 - | Union plug |
| 11 - | Vacuum hose |
| q | Insert into brake servo |
| 12 - | Protective cap |
| q | Check for correct seating |
| 13 - | 28 Nm |
| q | Replace after each removal |
| 14 - | Gasket |
| q | For brake servo |
