B3FD3MK1 - 607

EMERGENCY BRAKING ASSISTANCE CHECK, SYSTEM EVA BOSCH

1 - DATA : BRAKE CONTROL EVA

P : Master cylinder pressure (in bars) .

F : Pedal force (in dan) .

1 : Slow braking range .

2 : (emergency) rapid braking curve .

The emergency servo ratio is triggered when the brake pedal speed exceeds a speed threshold (adjusted in production) .

2 - ANOMALY(IES) - CAUSES - REMEDIES

anomaly(ies)	causes	remedies
the brake control is permanently over-assisted	master cylinder EVA : the fast gear remains engaged	check : master cylinder check EVA
no over-assistance during rapid braking	master cylinder EVA :valve faulty	check : master cylinder check EVA
pedal stiff	vacuum source faulty	check : VACUUM CIRCUIT
pedal travel long with no trace of an external leak	air in the circuit cup or valve faulty	- BLEED THE CIRCUIT REPLACE THE MASTER CYLINDER
significant drop in the brake fluid level with no trace of a leak	master cylinder : the brake fluid flows into the servo	REPLACE THE MASTER CYLINDER AND THE SERVO

3 - CHECK : FIRST METHOD

The check allows triggering of the system to be checked (curve 1 and 2), but not the trigger speed threshold .

This procedure is based on analysis of the sensations detected from the system EVA .

Drive at a speed of 50 km/h in 3 gear .

Press the brake pedal slowly until a normal urban driving type brake force is reached .

Maintain this force at a constant level until the vehicle stops .

With the vehicle stationary, maintain this force at a constant level then memorise it .

Release the brake pedal .

Drive at a speed of 50 km/h in 3 gear .

Press the brake pedal very rapidly, but with the same force as previously .

Conclusion :

the brake pedal should lower more easily and the deceleration should be very sharp (abs regulation)

If incorrect : replace the master-cylinder .

4 - CHECK : SECOND METHOD

The check allows triggering of the system to be checked (curve 1 and 2), but not the trigger speed threshold .

4 - 1 - SPECIAL TOOLS

[1] Braking pressure checking device (-).0808-ZY .

[2] Union for caliper bleed screw (-).0808-D .

Braking tester with approved pedometer PEUGEOT .

4 - 2 - SETTING UP THE TOOLS

Protect the wings and the seats .

Remove the left-hand front wheel .

Remove the front left side mud guard .

Route the larger of the two pipes (1) of the tool [1] from the engine compartment to the wheel arch .

	diameter and pitch of the bleed screws
LUCAS caliper	M7 X 100
BREMBO caliper	M10 X 100

Remove the left caliper bleed screw .

Fit the tool [2] .

Connect the pipe (1) to the union [2] .

Clamp the pipe (1) to the brake hose .

WARNING : the pipe (1) must not touch the rotating part .

Bleed the checking equipment .

Replace the front left side mud guard .

Fit the wheel .

Place the tool [1] in a plastic bag then place it next to the driver .

Install the pedometer .

Start the vehicle .

4 - 3 - CHECK

Carry out a complete manual front brake cycle .

Move the vehicle forward then start the rear brake checking cycle .

When conditioning appears on the screen, press the brake pedal gradually until a value of 5 da.n is displayed on the pedometer .

Note the value on the tool [1] : The pressure should be between 15 and 20 bars .

Release the brake pedal .

Wait for 30 seconds .

Press the brake pedal very rapidly to display a value of 5 da.n on the pedometer .

Note the value on the tool [1] : The pressure should be between 40 and 50 bars .

If incorrect : replace the master-cylinder .

if the values are correct and the triggering speed threshold is considered incorrect, replace the master cylinder .

bleed the brakes .