Dacia Solenza (engine E7J). Manual - part 70

GENERAL

30 - 11

30

Braking system diagnostic

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.

GENERAL

30 - 12

30

Brake connections and ducts

The connection between the brake ducts and the brake pump, brake calipers, pressure limiter

is performed by means of the connections threaded with metric pitch.

PARTS IDENTIFICATION

The cupping shape of the steel ducts  (A)

The shape of the threaded lengths on parts (B)

Connections of ducts (C)

A

B

C

GENERAL

30 - 13

30

Brake fluid

PERIODIC CHANGE OF THE BREAK FLUID

The manufacturing conception of the brakes equipping the Dacia vehicles especially the

ventilated disk brake, enable the maximum diminishing of the fluid vaporization, even in case of
intensive using of brakes (mountain area), due to good disk cooling.

The brake fluids, suffer in all cases a slight degradations during the use, by a slight humidity

absorption, that makes necessary the complete replacement after a period of time or after some
driving (4 years or 60,000 driven km)

COMPLETION OF THE BRAKE FLUID LEVEL

The wear of brakes pads and shoes, leads to a gradually diminution of brake fluid level in its

reservoir.

It is useless to compensate this diminution, because the level will be restored when changing

the brake pads and shoes.

Obviously, in the meantime, the level of brake fluid in  reservoir  must not  go  down bellow the

MINI mark.

HOMOLOGATED BRAKE FLUIDS

The mixture in the braking circuit of two non different brake fluids may leads to important

risks mainly due  to gasket damage, incompatible with new fluid.

In order to avoid such risks, it is obligatory to use only brake fluid recommended by the

producer, i.e. : SAEJ 1703, DOT 4.

GENERAL

30 - 14

30

Braking system purging

The air existence in the hydraulic circuit may be noticed by an elastic displacement of the brake

pedal, sometimes even, close to the floor. This fact is more evident with the engine running.

GENERAL  RECOMMENDATIONS

· Always use for completion or total changing the brake fluid SAE J 1703 , DOT 4.
· In case of changing the brake fluid it is necessary to wash the system with industrial alcohol.
· During the purging, the brake fluid from the reservoir must not go down bellow the MINIM

level marked on  the reservoir.

To perform the purging, one person will stay on the driver place, to press the brake pedal and

the other one will perform the purging at purging points, using a 500 ml vessel, a transparent
plastic tube and brake fluid for completion.

REMARK:
The brake fluid obtaine4d during performing the purging operation IS NOT TO BE

REUSED, but after 48 hours, to avoid air bubbles introduction in the hydraulic circuit.

PROCEDURE

Place on the purging screw, a transparent tube with its end in a vessel with brake fluid and

proceed as follows :

- press the brake pedal slowly;
- dismount the bleeding screw, maintaining the full stroke of the pedal;
- tighten the bleeding screw;
- slowly release the brake pedal.

Repeat the same procedure until complete cease of bubbles.
Proceed in the same way also for the other purging places.
Take into consideration the existence all the time of the brake fluid in the reservoir.

OBSERVATION : Before beginning the purging procedure, dismount the I.C.P. contact

from the brake pump that it will be remounted at the end of the operation, brake pedal released.

It is important to observe the following sequence of the purging points:

1. Main brake cylinder;
2. Left rear wheel  brake cylinder;
3. Right rear wheel  brake cylinder ;
4. Caliper of front right wheel ;
5. Caliper of front left wheel;
6. By-pass circuit through main cylinder  purge.