• Home
  • News
  • Club
    • Club History
    • Forum
  • Tech
    • BX 16 Valve Braking System
    • BX 16 Valve Cooling System
    • BX 16 Valve Electrical Sytem
    • BX 16 Valve Engine
    • BX 16 Valve Fuel Injection System
    • BX 16 Valve Hydraulic System
    • BX 16 Valve Ignition System
    • BX 16 Valve Suspension
  • Brochures
    • BX 16 Valve Sales Brochures
    • BX Range Sales Brochures
    • BX Related Brochures
  • Racecars
    • Team BX Sport
    • BX 16 Valve Lap Records
    • Media Matters
    • News for 2005 Racing Season
    • News for 2006 Racing Season
    • Race Car Pics
  • Videos
  • Downloads
  • Citroen
  • Links
  • Credits

BX 16 Valve Club

Home of the Citroen BX 16valve Enthusiast

You are here: Home / Technical Info / BX 16 Valve Braking System
  • P1 Press Pack
  • 1989 Brochure
  • GC Croft 2004 BX 16 Valve
    Gary Cole Croft 2004
  • P1 Brochure
  • 1990 Brochure
  • 1987 Brochure
  • Cadwell Park 2005 BX 16 Valve
    Gary Cole Cadwell Park 2005
  • 1988 Brochure
  • Brands Hatch 2005 BX 16 Valve
    Gary Cole Brands Hatch 2005
  • Exclusiv Tuning for Citroen Poster
    Exclusive Tuning for Citroen Postert
  • Citroen BX 61 Valve Engine Drawing
    BX 16valve (D6C) Engine
  • 1991 Brochure

BX 16 Valve Braking System

Type

Discs all round, dual hydraulic circuit supplied by main hydraulic system, automatic rear brake limitation. Front pad wear warning system. Cable operated handbrake to front wheel discs.

ABS type

Electro-hydraulic controlled anti-lock brake system, complementary to standard system.

Front brakes

Disc diameter 266 mm
Disc Thickness New 20.4 mm
Maximum disc run-out 0.2 mm
Minimum pad lining thickness Indicated by warning lamp

Rear brakes

Disc diameter 224 mm
Disc Thickness New 7 mm
Wear limit 4 mm
Maximum disc run-out 0.2 mm
Minimum pad lining thickness 2 mm – suggested

Pedal

Brake pedal-to-compensator valve clearance:

1st type 1.0 to 3.0 mm
2nd type 0.1 to 1.0 mm

Wheel sensor – ABS

Air gap (non-adjustable)

Front 0.30 to 1.0 mm
Rear 0.50 to 1.10 mm

General Information

This dual circuit system, with disc brakes fitted to all wheels, is hydraulically operated from the main hydraulic system.

The front brakes are supplied from the hydraulic pressure regulator and the rear brakes are supplied from the rear suspension system. This arrangement favours the front brakes and imposes a braking effort limitation on the rear axle in relation to the load. The braking action is applied through the brake pedal operating a hydraulic control valve which allows pressure to the braking system.

The front brake pads are equipped with internal electric leads which operate a warning lamp on the instrument panel when the linings are due for renewal.

The front brake calipers comprise outer halves which are removable and inner halves which are integral with the steering knuckles.

The rear brake pads and calipers are mounted on the rear suspension arms The pads do not incorporate a warning system.

The handbrake is operated by a floor mounted lever. Cables run to and operate each front caliper to force the friction pads against the discs.

Anti-lock braking system (ABS)

 An anti-lock braking system is fitted to the BX 16v.The function of the ABS is to prevent the brakes from locking the roadwheels when applied, thereby retaining steering control and giving the shortest-possible stopping distance for emergency braking. The system operates at speeds in excess of 5 mph and when in operation, controls the vehicle deceleration until it is brought to a halt.

The ABS monitors the rotational speed of each roadwheel during braking. If any wheel begins to slow at a faster rate than the others thereby showing that it is on the point of locking, the ABS reduces the hydraulic pressure to that wheel’s brake caliper. As the wheel grips again, its rotational speed matches the others and hydraulic pressure to the caliper is restored. This cycle can be repeated several times per second.

The ABS is operated by the following hydraulic and electronic components, which are complementary to the standard brake system.

  1. Front and rear wheel sensor units – on the driveshaft joints/wheel hubs.
  2. Hydraulic control block unit – on the left-hand wheel arch in the engine compartment.
  3. Electronic control unit (ECU) – under the front passenger seat.

In common with the standard system, the front and rear brake hydraulic circuits are separate but the ABS differs in also separating the right and left-hand front brake circuits. The remaining brake system components and layout are otherwise the same as standard.

The hydraulic control block contains six electro-valves, each of the three brake circuits having its own idle and return valve which work in accordance with the ECU.

The electronic part of the system comprises the ECU and a speed sensor unit for each roadwheel. Each driveshaft outer CV joint and each rear wheel hub has a toothed rotor, the speed of which is recorded by the adjacent sensor unit. This unit in turn relays the signal to the ECU. From the signals received by the ECU from each roadwheel, the average road speed is calculated and any sudden acceleration or deceleration accounted.

An automatic checking device is built into the electronic control unit. Any faults in the ABS will illuminate the yellow warning light on the instrument panel and cancel the ABS (but still allow normal braking). The yellow warning light will also light up when the ignition is initially switched on but will cancel as soon as the engine is started.

If a fault develops or is suspected in the ABS, then the system must be checked by a suitable mechanic.

Further details of the system are available in the Downloads section which features pages from the Technical Manuals.

RSS Latest forum posts

  • BX16v.com Chat • Re: The BX Project
  • BX16v.com Chat • Re: Tracking down dad's old BX
  • BX16v.com Chat • Re: The BX Project
  • BX16v.com Chat • Re: Tracking down dad's old BX
  • BX16v.com Chat • Re: Tracking down dad's old BX
  • BX16v.com Chat • Tracking down dad's old BX

Latest News

  • Housekeeping 26th August 2017
  • Video Added – 9th October 2015
  • Web site Re launch – 8th August 2015
  • Exciting race at Brands Hatch – 4th June 2015
  • Videos – 4th June 2015
  • Hello world! 31st January 2015

Site Map

  • Welcome!
  • News
  • Owners Club
    • Club History
    • Forum
  • Technical Info
    • Braking System
    • Cooling System
    • Electrical Sytem
    • Engine
    • Fuel Injection System
    • Hydraulics System
    • Ignition System
    • Suspension
  • Sales Brochures
    • BX 16 Valve
    • BX Range
    • BX Related
  • BX 16v Racecar
    • BXSport
    • Lap Records
    • Race Car Pics
    • News: 2006 Racing
    • News: 2005 Racing
  • About Citroen
  • Downloads
  • Videos
  • Links
  • Credits

Copyright © 2023 BX16Valve

Site Re-design by Sheffield Computer Services

Forum image uses icon made by Freepik from www.flaticon.com is licensed under CC BY 3.0