Dacia Pick-Up 1304/1305/1307. Manual - part 67

GENERAL

30

I. CONSTANT EFFECT TO THE PEDAL

EFFECTS

Tough pedal:

High effort for small deceleration.

Elastic pedal
In order to diagnose, an incident where

the use was normal is to be analyzed and two
tests are to be performed:
   1. While driving the vehicle :
  Interpretation test: pedal stroke/ deceleration
rate.
   2. While vehicle is stopped, engine cut.
  Additional test of brake pedal press:
  Perform five consecutive pressings on the
brake pedal in order to vacuum the
servobrake, before taking into consideration
the test result.

 

Long pedal

The test is to be performed with stopped

vehicle and  cut engine.

REMARK:

      I t  is  neces sary to perform five
consecutive pressings on the brake pedal,
in order to vacuum the servobrake before
taking into consideration the test result.

Floor pedal
The test is to be performed with stopped

vehicle and  cut engine.
   REMARK :
   Perform five consecutive pressings on
the brake pedal, in order  to vacuum the
servobrake  before takin g into
consideration the test result.

POSSIBLE CAUSES

- Assistance defect
- Brake linings:
     - greasy
     - stacking to the disk ( non-conform )
      - heating, prolonged braking with constant
pedal press
- Stuck piston

 - Rigid duct narrowed (flattening)

- Air presence in the circuit: defective purging
- Internal leak in the braking circuit.
- Leak of fluid from reservoir (external fluid
leak from braking circuit).

Automatic adjustment : hand brake cable too
tighten.

- Important and asymmetric wear of the
brake linings
- Stroke too ample between the servobrake
pushing rod and the brake pump
- Brake fluid having high temperature.

- Hydraulic leak (check the sealing of the

braking system components)

- Sealing gaskets defects of the two brake

pump circuits.

-  Brake fluid having high temperature

30 - 14

DIAGNOSTIC

GENERAL

30

II. CONSTANT EFFECT AT BEHAVIOUR

EFFECTS

Brakes not accomplishing the required
braking distance

Vibrating brakes

When braking, the vehicle ( front part)

is left/right deviating

Braking

Heating brakes

POSSIBLE CAUSES

- Non-uniform worn brake linings (backing
off);
- Brake linings slightly greased;
- Springs with modified characteristics.

- Brake disks with high wobbling;
- Inconstancy brake disks width;
- Particles abnormal deposit on brake disks
(oxidation between linings and disk).

-  Front axle suspension, steering (to be
checked);
- Stuck piston;
- Tires – wear, inflation pressure;
- Rigid duct narrowed (flattening).

- Stuck piston;
Automatic adjustment : hand brake cable very
tighten.
    REMARK :
       Automatic recovering is performed by
means of the brake pedal, if there is no ab-
normal tension in the hand brake cable
when released (hand brake released).
- Return spring.

- Insufficient hydraulic stroke of the brake
pump, not allowing the return at rest of the
brake pump pistons ( brake pump remaining
under pressure);
- Stuck pistons or hardly returning;
- Rigid duct narrowed (flattening);
- Defective adjustment of the hand brake
control.

30 - 15

DIAGNOSTIC

GENERAL

30

31 - 16

FRONT AXLE ANGLES

CAMBER  ANGLE 1

0

 30’ +/- 30’

It is formed by the wheel plane with the vertical that crosses the wheel axis.
A difference higher that 1°between the two camber angles (left side and right side) leads to:

- the deviation from the trajectory that must adjusted by means of the steering  wheel;
- abnormal wear of the tires and bearings.

This angle results  from building may not be adjusted.

THE CASTER ANGLE  4

0

+/- 1

0

This angle is formed in the vehicle longitudinal plane , by  the axis of the attach-

ment point of the steering knuckle by means of the suspension ball joint and the ver-

tical that passes through the front wheel shaft.

A difference higher than 1° between the two angles  (left side and right side) leads to:

- the deviation to the trajectory that must be adjusted by means of the steering wheel;
- irregular wear of the tires.

STEERING GEAR BOX POSITION

The steering gear box should be placed at a certain height from the attachment points of the

steering auxiliary connecting rod ball joints.

The position of the steering gear box influences the variation of the parallelism.

The steering box is mounted in the position for which the variation of the parallelism is

minimal.

The modification of the parallelism between left  side and  right  side leads to:

-  the deviation of the vehicle from trajectory  in one sense upon accelerating;
- the deviation of motor car in the opposite side upon braking;
- the deviation of the trajectory on the hilly ground;
- the premature wear of the tires.

The horizontally of the steering box is ensured by the producer.

THE INFLUENCE OF ANGLES

GENERAL

30

31 - 17

PARALLELISM

It is measured in horizontal plane as a difference between the front and rear part of the wheels

of same axle.

The wheels of the front axle are :

- divergent for DACIA commercial vehicles  with front drive (opening 1 – 4 mm);
- convergent  for DACIA commercial vehicles with rear drive or four wheels drive

(closing 1 – 3 mm).

ATTENTION!

A too much opening causes the wear of the tires towards the interior.
A too much closing causes the wear of the tires towards the exterior.

  THE TRANSVERSAL INCLINATION ANGLE OF THE BALL  JOINTT

 8

0

+/- 30’

It is formed by the ball joint axle and the vertical, measured in transversal plane.
The purpose of this angle is the same with the one of the caster angle: retrieve the wheels after

turning, in the corresponding position for rectilinear driving and to maintain this movement.

This angle is not adjustable.

NOTE :

The parallelism, the transversal inclination of the ball joint and the parallelism

variation are adjustable.

THE INFLUENCE OF ANGLES