The value set for checking PF pressure of the front brake must be a higher value than that one obtained
with the following formula: Pressure at the LSPV turning point: Pc + 4.9 MPa.
3. Pressure measurement
Push the brake pedal, so that the front brake pressure can reach the value set in the phase "Calculation
to check front brake pressure". At this stage, read the rear brake pressure.
N.B.
•
IF DURING THE TEST, ONCE THE FRONT BRAKE PRESSURE IS SET, PRESSURE IS
INTERRUPTED ON THE PEDAL, OR THE PEDAL IS RELEASED DURING THE LOWER-
ING TRAVEL, REMOVE THE FOOT FROM THE PEDAL COMPLETELY. THEN REPEAT
THE OPERATION.
•
SET THE REAR BRAKE PRESSURE VALUE ABOUT TWO SECONDS AFTER THE
FRONT BRAKE PRESSURE IS SET.
4. Pressure test
1. Calculate the reference pressure PR of the rear brake, according to the pressure (PC) at the LSPV
turning point and the checking hydraulic pressure PF of the front brake, calculated at step 2.
PR = 0.1 PF + 0.9 C
2. Calculate the range allowed of the rear brake pressure according to following formula:
Value allowed for the larger side (MPa) : X = 1.98 x 10-3 Wr - 0.19
Value allowed for the smaller side (KPa) : Y= 1.60 x 10-3 - 0.14
3. Determine the rear brake reference pressure according to phases 1 and 2. The rear brake hydraulic
reference pressure must be between (PR + y) and (PR + x).
4. The rear brake pressure measured at step 3 is satisfactory if its value matches the one calculated
above phase. Otherwise, adjust the LSPV.
5. Reference
With a person sitting in the vehicle, place a weight to load the rear axle as it is described:
DO NOT EXCEED 10 KG OF DIFFERENCE BETWEEN RIGHT AND LEFT
Characteristic
Rear axle weight for Pickup
400 ± 5 kg
Rear axle weight for Van
450 ± 5 kg
At this stage, push the brake pedal so that the front brake pressure can turn into 7.85 MPa.
Make sure that the rear brake pressure complies with specifications.
Characteristic
Pickup
2.08 - 2.86 Mpa
Van
1.95 - 2.72 Mpa
Braking system PORTER 1.3 16V
BS - 646
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