ar4225b002001ta

Check braking behavior on tractor vehicle

Typ ar · téma 42.25 · verze 0104 · 2016-02-12

Platí pro:

Není k dispozici v jazyce „cs“; zobrazeno v jazyce Angličtina.

Zařazení

Funkční skupina 2 Podvozek › 42 Brzdy - hydraulická část a mechanická část › 42.25 Elektronicko-pneumatická brzda (EPB) — Řada 958

EinPAS 21 Brzdy/podtlakový systém/vzduchotlaké zařízení › 21.15 Provozní brzda/podtlakový systém › 21.15.5 Kompletní brzdová soustava — Řada 958

AR42.25-B-0020-01TA

Check braking behavior on tractor vehicle

OF

Test sheet form for braking behavior of tractor and trailer vehicles

OF42.10-B-3000-01TA

1 Apply the pressure staggering (pm) on the brake coupling terminal as per test sheet and record the pressures in the brake cylinders (p1 to p4) and the brake forces (F1 to F4) for each wheel in the test sheet. Record the locking limit.
Utilize the form “test sheet for braking behavior of tractor and trailer vehicles”. Use only values below the locking limit. Utilize the crescent pressure staggering and test with high pressure, always release the operation brake.

2 Add the brake forces (F1 to F4) of the individual axles and record the sum of the brake forces (FM) of the tractor vehicle related to the pressure staggering (pm) on the test sheet.

3 Calculate the braking (z) by pressure staggering (pm).
z = [Sum of the brake forces (FM)] [Total permissible weight (GM)] 100 (%)

Example for investigating the braking (z) of the tractor vehicle:

Sum of the brake forces (FM) in pm 2.0 bar = 2790 daN

Total permissible weight (GM) = 18,000 kg

z = (2790 18,000) 100 (%) = 15.5 %

With 1 bar pressure at the brake coupling terminal the wheel braking actuation must already be recorded.

Example of the brake forces investigated:

Brake coupling terminal

Complete

pm (bar)

FM (daN)

z (%)

0,0

460

2,6

0,5

460

2,6

1,0

780

4,3

1,5

1800

10,0

2,0

2790

15,5

2,5

3590

19,9

3,0

4500

25,0

4,0

6220

34,6

5,0

7400

41,1

6,5

9200

51,1

>8,5

-

-

Check braking behavior on tractor vehicle

W42.00-1027-81

4 Transfer the calculated braking values (z) for each pressure staggering (pm) of the test sheet for the EG braking range. A curve is formed by means of joining points, that indicates the braking process (braking behavior) of the tractor vehicle.
If the braking process is outside the EG braking range or in case of too high pressure responses the brake complaint has to be filed. The brake system of the tractor vehicle has, then, be checked and the fault investigated or the wear have to be repaired. Brake system modifications are permissible only with the assembly plant's agreement.

1 Braking process of the tractor vehicle

U EG braking range, laden tractor vehicle