Leon Mk2
| ABS Bosch 5.7 (ABS/EDS/ASR/ESP) |
Note| t | The master brake cylinder and the servo brake can be replaced independently |
| t | All banjo bolts of the brake system lines must be tightened to 14 Nm. |
| 1 - | ABS hydraulic unit |
| q | The ABS hydraulic unit -N55 -, ABS hydraulic pump -V64- and intake and exhaust valves are checked by self-diagnosis. |
| q | The ABS hydraulic pump -V64- must not be separated from the valve block |
| q | removing and fitting → Chapter. |
| q | When replacing the hydraulic unit, the used part must always be locked with the seal plug of the repair set → Parts catalogue. |
| 2 - | Brake pipe connection |
| q | Hydraulic unit to front left brake clip |
| q | Hydraulic unit code -VL- |
| 3 - | Brake pipe connection |
| q | Hydraulic unit to front right brake clip |
| q | Hydraulic unit code -VR- |
| 4 - | Brake pipe connection |
| q | Master brake cylinder/floating piston circuit to hydraulic unit → Chapter |
| q | Hydraulic unit code -HZ2- |
| 5 - | Brake pipe connection |
| q | Master brake cylinder / pressure-rod piston circuit to hydraulic unit |
| q | Hydraulic unit code -HZ1- |
| 6 - | Brake pipe connection |
| q | Hydraulic unit to rear left wheel cylinder/calliper |
| q | Hydraulic unit code -HL- |
| 7 - | Brake pipe connection |
| q | Hydraulic unit to rear right wheel cylinder/calliper |
| q | Hydraulic unit code -HR- |
| 8 - | Retainer |
| q | For brake pipes |
| 9 - | Retainer |
| q | For brake pipes |
| q | 2 pins |
| 10 - | Retainer |
| q | For brake pipes |
| q | 3 pins |
| 11 - | 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 servo brake is working correctly the brake pedal will give way notably (the servo brake 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 |
| 12 - | Brake master cylinder |
| q | Cannot be repaired. If faulty, replace completely. |
| q | Checking for leaks → Chapter |
| q | removing and fitting → Chapter. |
| 13 - | Brake fluid deposit |
| q | removing and fitting → Item. |
| 14 - | Nut, self-locking |
| q | 20 Nm |
| q | Replace after each removal |
| 15 - | Retainer |
| 16 - | Bolt |
| q | 8 Nm |
| 17 - | Retainer |
| q | For hydraulic command unit |
| 18 - | Locking hexagonal bolt |
| q | 20 Nm |
