Dacia Pick-Up 1304/1305/1307. Manual - part 92

37

MECHANICAL ELEMENTS CONTROLS

BRAKE PUMP REPAIRING

The operation is performed after dismounting the central pump off the vehicle.

D

ISMO UNTING

Dismount the brake fluid reservoir, recovering the two gaskets.
Dismount the transducer and the purging screw.
Clamp a 3,5 mm drill in the vice.
Introduce the drill in the elastic pin of the primary piston.
Rotate and draw the pump until the pin is extracted.
Extract the secondary piston elastic pin, in the same way.

BRAKE PUMP

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MECHANICAL ELEMENTS CONTROLS

37

Remove from the pump bore :

- the primary piston assembled with Pp gaskets;
- the primary piston return spring;
- the secondary piston assembled with Ps gaskets;
- the secondary piston return spring.

Wash the parts with alcohol and blow them with compressed air.
Check:

- the pump bore;
- the pistons gaskets the springs.

The parts of the “ primary piston” Pp and those of the “secondary piston” Ps, cannot be

repaired. In case one of these parts is damaged, replace the whole” primary piston” and
“secondary piston” assembly.

R

EMO UNTING

Before remounting, the parts and the pump bore will be lubricated with brake fluid.
Mount the “ secondary piston”, retained spring and “primary piston “ assemble.
Compress the pistons and introduce the elastic pins; the elastic pins slot shall be  oriented

towards the back of the pump (towards the pushing rod).

Mount the purging screw.
Purge the brake circuit and remount the ICP transducer.

BRAKE PUMP

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37

MECHANICAL ELEMENTS CONTROLS

  MASTER - VAC SERVOBRAKE

NOTE :

In case one circuit is damaged, the pedal stroke shall be longer, the braking being

done only by the circuit still working.

The servobrake cannot be repaired.
The only items which are to be replaced are the air filter and the retainer valve.

SERVOBRAKE

T

IGH TENING

 

CO UPLE

 ( daNm

 )

Servobrake on the iron brake

2

The attachment nut of the central pump with servobrake       1,3

CHARACTERISTICS

The Master-Vac servobrake is a brake booster with the objective of reducing the driver

effort on the brake pedal and may  be of  152 mm or 177,5 mm with a minimal booster rate
of 1,9.

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MECHANICAL ELEMENTS CONTROLS

37

D

ISMO UNTING

Drain the liquid out of the reservoir.
Detach the four brake ducts from the pump.
Disconnect the  electrical  contact from ICP

transducer.

Dismount  the central pump from the

servobrake.

Disconnect t he suction hose  of the

servobrake.

Dismount :

- the connecting fork shaft  to brake

pedal (1);

- the attachment nuts of the servobrake

on the iron plate.

Dismount the servobrake.

R

EMO UNTING

Before remounting, check:

- the adjustment of the main cylinder stroke, which is obtained by acting on the

pushing rod (P) nut in order to obtain value X = 9mm,between the pushing rod end and the
rest surface of the main cylinder;

- the adjustment in  order to obtain the value  L = 131 mm  is performed by screwing or

unscrewing the fork C, followed by blocking the lock nut E.

For remounting, perform the dismounting operations in the reverse order.
Purge the brake circuit.

SERVOBRAKE

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