OF42.20-L-3000-01B | Data sheet for checking compressed-air system of spring brake, form |
MODELS 668.###, 670.### ## up to 101651
Vacuum-assisted brake system with electrical air compressor (power brake system)
Branch/Agency - Firm no. Customer
Vehicle ident no. Repair order no.
Tester: Name Date
License plate no. Original registration date Model Engine no. Odometer reading: km/miles
B65: Standard Retrofitting
(delete as appropriate)
Operating voltage in V:
When filling the system for the first time between 0 and 12 bar operating pressure the indicator lamps must go out in the following sequence.
1. Release control, red (P)
2. Readiness indicator lamp, red (!)
3. Ancillary consumer, yellow
If this sequence is not adhered to (e.g. 1., 3., 2.), the overflow valve should be adjusted.
Check
Target
Actual
Remarks
Leaktightness of the system as per Art. 29 d. German licensing regulations (StVZO) at 3 bar pressure reduction after 1 min
Max. 5%
Overflow valve setting
10.5 bar (- 0.3 bar)
Filling time 0 to 12 bar
3 to 6 min
Filling time 10.5 to 12 bar
1.0 min (+ 0.5 min)
Symbol lamps:
Color red
Parking brake off (P),
pressure switch B5
5.8 bar ( 0.3 bar)
Readiness (!) off (in 2.5 to 3 min), pressure switch B14
8.4 bar ( 0.4 bar)
Symbol lamps:
Color - yellow (also red in older vehicles)
Supply pressure of air reservoir V2 off, pressure switch B12
5.8 bar ( 0.3 bar)
Air compressor on, pressure switch B75
11 bar (- 0.5 bar)
Air compressor off, pressure switch B74
12.5 bar (- 0.5 bar)
Opening pressure of safety valve
13.8 bar (+ 1.2 bar)
Opening time of air drier
regeneration valve
approx. 10 seconds