Citroen C5 Aircross Quiz
Mechanical specifications

Brakes

In this manual: Mechanical specifications
AAS - Parking Aid — 8Owner's Manual Citroën C5 II — 139Citroen C5 Aircross (2017- 2024) - Owner's Manual — 143Audio system — 14Overspeed control — 7Multifunction display — 4Driver information instrument cluster — 20Navigation assistance — 8Intruder alarm — 7Mechanical specifications — 9Power supply — 8Electrical equipment — 13Lighting and electrical equipment — 3Immobiliser — 4Sunroof — 10Exterior lighting / signalling — 38Multiplexing — 7Air conditioning — 7Body — 6General specifications — 9Automatic gearbox control — 3Exterior mirrors — 10Airbags — 5Defrost — 6Underinflation — 6Interior lighting — 4Wipers / Washers — 6Window lifters — 11Cooling — 8Opening management — 7Cruise control — 5Suspension — 4Grip management — 1Paint — 2Exterior lighting control — 1Indicators (turn signals) — 1Automatic lighting systems - General recommendations — 1Wiper control — 1Special position of the front wipers — 1
~2min read

BRAKE CONTROL

Commande de freins

Note: Emergency brake assist increases the booster ratio from 6.6 to 23.

FRONT BRAKES

Front brake discs

Disques de freins avant

Front brake calipers

Etriers de freins avant

Front brake pads

 Plaquettes de freins avant

REAR BRAKES

Freins arriere

EMERGENCY BRAKE ASSIST

Overview

Emergency Valve Assistant (EVA 2) reduces braking distance in the event of a sudden brake application.

The brake control consists of a specific master cylinder and a new-generation brake booster.

The hydromechanical system has 2 states:

  • during slow braking, the booster ratio is 6.6,
  • In emergency braking, the boost ratio is 23.

The force applied to the brake pedal determines the switch from the slow braking ratio to the boost braking ratio.

When the brake pedal application speed exceeds a threshold of 580.8 mm/s, the emergency braking ratio is activated and the pressure generated in the master cylinder is higher.

This action is triggered by a mechanical 'double piston' system located upstream of the brake assist system.

When the brake pedal is pressed firmly, the primary piston actuates a second piston, producing maximum pressure in the brake circuit until ABS control takes over.

Brake master cylinder and brake booster assembly

Ensemble maître cylindre et amplificateur de freinage
Brake master cylinder and brake booster assembly

Primary piston description

Description du piston primaire
Primary piston description

Key:

  • 31 - Primary piston
  • 33 - Retaining spring
  • 34 - Valve spring
  • 35 - Jump spring
  • 36 - Reaction piston
  • 37 - Ratio control
  • 38 - Fast piston

ABS/ASR

Traction control (ASR)

The traction control (ASR) function prevents the driven wheels from spinning during acceleration.

This maintains the vehicle's directional stability and manoeuvrability.

The system brakes each driven wheel independently to prevent it from spinning. The ABS/ASR control unit analyses the wheel sensor signals and determines whether a wheel spin situation exists when starting on low-grip surfaces.

In this case, the ABS/ASR control unit commands braking of the wheel(s) that are spinning.

Brake compensator

The ABS/ASR MK 60 control unit incorporates the electronic brakeforce distribution (EBD) system.

Therefore, the vehicle does not have a brake proportioning valve.

The hub is fitted with a bearing with an integrated magnetic encoder ring (48 pole pairs).

ABS/ASR specifications

 Caractéristiques ABS/ASR

Test yourself

A quick Citroen C5 Aircross quiz: every answer comes with an explanation and a link to the manual page.