Range Rover Evoque: Power Brake Actuation

Brake Booster - Component Location

COMPONENT LOCATION - 2.2L Td4

NOTE: RHD (right-hand drive) installation shown, LHD (left-hand drive) installation similar

1. Brake booster
2. Vacuum pipe (vehicles with stop/start system)
3. Vacuum pump
4. Vacuum pipe (vehicles without stop/start system)
5. Non return valve (vehicles without stop/start system)
6. Brake vacuum sensor

COMPONENT LOCATION - 2.0L GTDI

NOTE: RHD installation shown, LHD installation similar.

1. Non return valve
2. Brake booster
3. Vacuum pipe
4. Vacuum pump

Brake Booster - Overview

OVERVIEW

Power assistance for the braking system is provided by a vacuum operated, non-active brake booster. The vacuum required for brake booster operation is created by an engine driven vacuum pump.

Rigid plastic piping connects the vacuum pump to the brake booster. Vehicles fitted with the stop/start system incorporate a brake vacuum sensor in the piping. A non return valve, installed on the front of the brake booster or in the brake vacuum sensor, maintains the vacuum necessary for brake booster operation.

Brake Booster - System Operation and Component Description

System Operation

Not applicable.

Component Description

BRAKE BOOSTER

The brake booster is located on the driver side of the engine compartment, and is sealed to the bulkhead with a gasket and secured with 4 studs and locking nuts. The brake booster actuating push rod is attached to the brake pedal with a clevis pin. The brake booster output rod locates in the primary piston of the brake master cylinder.

The brake booster is a compact unit that occupies less space than a conventional brake booster, improving the vehicles crash performance characteristics. The unit is installed with tandem diaphragms that are 203.20 mm (8.00 in) and 228.60 mm (9.00 in) in diameter and operate as a single unit.

VACUUM PUMP

1. Vacuum pump - diesel engines
2. Vacuum pump - gasoline engines

1. Brake booster port
2. EGR (exhaust gas recirculation) port

For both gasoline and diesel engines, the vacuum pump is attached to the rear of the engine and driven by the intake camshaft.

On diesel engines, the vacuum pump has an additional vacuum port, which is connected to the EGR system.

Refer to: Engine Emission Control (303-08A Engine Emission Control - TD4 2.2L Diesel, Description and Operation).

BRAKE VACUUM SENSOR

The brake vacuum sensor monitors vacuum reserves in the brake booster. The sensor is mounted in the vacuum pipe and hardwired to the ECM.

Refer to: Starting System - AWD (303-06A Starting System - TD4 2.2L Diesel, Description and Operation).

Power Brake Actuation

General specification

Torque Specifications

Brake Booster

Removal

CAUTION: If brake fluid is spilt on the paintwork, the affected area must be immediately washed down with cold water.

NOTE: Removal steps in this procedure may contain installation details.

All vehicles

1. Make the SRS system safe.

Refer to: Standard Workshop Practices (100-00 General Information, Description and Operation).

2. Refer to: Driver Lower Air Bag Module (501-20B Supplemental Restraint System, Removal and Installation).

3. Refer to: Driver Lower Air Bag Module (501-20B Supplemental Restraint System, Removal and Installation).

4. Refer to: Brake Master Cylinder (206-06 Hydraulic Brake Actuation, Removal and Installation).

Left-hand drive vehicles

5. Refer to: Battery Tray (414-01 Battery, Mounting and Cables, Removal and Installation).

6. Torque: 10 Nm

7. WARNING: Fluid loss is unavoidable, use absorbent cloth or a container to collect the fluid.

Use new blanking caps. Torque: 17 Nm

Right-hand drive vehicles

8. WARNING: Fluid loss is unavoidable, use absorbent cloth or a container to collect the fluid.

Use new blanking caps. Torque: 17 Nm

All vehicles

9. Torque: 25 Nm

10.

Installation

1. To install, reverse the removal procedure.

Brake Vacuum Pump GTDi 2.0L Petrol

Removal

CAUTION: Make sure that all openings are sealed. Use new blanking caps.

NOTE: Removal steps in this procedure may contain installation details.

1. Refer to: Air Cleaner (303-12A Intake Air Distribution and Filtering - TD4 2.2L Diesel, Removal and Installation).

2. Refer to: Air Cleaner Intake Pipe (303-12B Intake Air Distribution and Filtering - GTDi 2.0L Petrol, Removal and Installation).

3.

4.

5. CAUTION: Be prepared to collect escaping oil. Torque: 10 Nm

6. CAUTION: Note the fitted position of the component prior to removal.

7. CAUTION: Discard the seal.

Installation

1. CAUTIONS:

A new O-ring seal is to be installed.

Take care not to damage the O-ring seals during installation.

To install, reverse the removal procedure.

Brake Vacuum Pump TD4 2.2L Diesel

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. Refer to: Engine Cover - TD4 2.2L Diesel (501-05 Interior Trim and Ornamentation, Removal and Installation).

2. Refer to: Air Cleaner (303-12, Removal 2. and Installation).

3. Torque: 9 Nm

4.

5. CAUTION: Make sure that all openings are sealed.

6. CAUTION: The seals are to be reused unless damaged. Torque: 9 Nm

7. NOTE: Do not disassemble further if the component is removed for access only. Torque: 9 Nm

Installation

1. CAUTION: Make sure that the mating faces are clean and free of foreign material.

To install, reverse the removal procedure.

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