BENDIX MC-12 MODULATOR CONTROLLER ASSY Guide de dépannage Page 33
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- Table des matières
- DEPANNAGE
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Noté. / 5. Basé sur avis des utilisateurs
31
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Trailer Spring Brake Valves
Trailer spring brake valves are designed for use in
trailer air brake systems.
The SR-4
™
trailer spring brake valve was an earlier
design that used a dedicated spring brake reservoir for
release of the trailer spring brakes. Note: This valve
is available for service only, due to changes made in
FMVSS 121 (superseded by SR-5
™
). All other Bendix
spring brake valves use service reservoir air for trailer
spring brake release.
Mounted on one of the trailer reservoirs, these
valves control both the parking and emergency
brake functions of the spring brakes and use internal
pressure protection and check valves to isolate
reservoir failures to prevent automatic application of
the trailer spring brakes. An anti-compound feature
is part of these valves.
With later government regulations allowing simplifi ed
system plumbing, Bendix developed the SR-5
™
trailer
spring brake valve. It also mounts to a reservoir on the
trailer and, like the SR-2
™
& SR-4
™
trailer spring brake
valves, it controls the trailer spring brakes, but unlike
these valves, the SR-5
™
trailer spring brake valve
uses supply line pressure to release the trailer spring
brakes. Because dedicated or isolated reservoir
pressure is no longer required by law for spring brake
release, the SR-5
™
trailer spring brake valve system
needs only one reservoir for service volume on single
axle trailers. Two reservoirs are generally required for
service volume requirements on tandem axle trailers.
SR-4
™
Spring
Brake Valve
(Original Design)
SR-4
™
Spring
Brake Valve
(Revised Design)
SR-2
™
Spring
Brake Valve
SR-5
™
Spring Brake
Valve
SRC-7000
™
Spring
Brake Valve
(See next page)
Look for
drilled hole
An integral anti-compound feature is part of the SR-5
™
trailer spring brake valve. The SR-5
™
is a “spring brake
priority” trailer valve.
Trailer Spring Brake Valves
Note: The SR-5
™
trailer spring
brake valve looks very similar to the
original design of the SR-2
™
valve.
Look for a hole drilled into the fl at
surface between the pressure
protection valve and the body for
positive SR-5
™
trailer spring brake
valve identifi cation.
ABS Controller/
Relay Assembly
SR-5
™
Trailer
Spring Brake
Valve
Typical SR-5
™
Trailer Spring
Brake Valve
Tandem Axle
Trailer Air
System
Service
Reservoir
Service
Reservoir
Some System Designs use a Single Two-Compartment Reservoir
- Air Brake Handbook 1
- The Air Brake Handbook 3
- Device Index 4
- Handbook Section Index 5
- General Precautions 6
- Section 1: An Overview 7
- Bendix Air Compressors 8
- Compressors 10
- Concerns? 11
- Governors and Components 12
- Reservoirs and Components 13
- Air Dryers 14
- Air Dryers and Filters 15
- Dual Circuit Brake Valves 17
- Actuators 19
- Slack Adjusters 20
- Foundation Brakes 21
- Foundation Brakes, continued 22
- Quick Release, Ratio Valves 23
- Ratio, Proportioning Valves 24
- Relay Valves 25
- Push-Pull Valves 26
- Spring Brake Valves 27
- Lever Operated Control Valves 28
- Additional Control Valves 29
- Park Co ntrol Valves 30
- Emergency Systems 30
- Dash Control Modules 31
- Tractor Pr otection Valves 32
- Trailer Spring Brake Valves 33
- ABS Components 37
- Truck a nd Tractor ABS 38
- Operation 38
- ATC Operation 39
- Advanced ABS 40
- Advanced ABS Features 42
- Trailer ABS Components 43
- Trailer ABS Operation 43
- “Curb-Side” 44
- “Driver-Side” 44
- Controllers with PLC 45
- Troubleshooting ABS 46
- A - Display 48
- B - Receiver 48
- C - Sensor 48
- Bendix M odules 49
- Pre-Trip Safety 49
- Inspections 49
- Fan Clutches 49
- Friction 50
- Braking Force 50
- Leverage 52
- Deceleration 53
- Deceleration (continued) 54
- Properties of Compressed Air 55
- The Fundamentals of 57
- Compressed Air Brakes 57
- S-Cam and Air Disc Brakes 58
- Air Brake System Balance 59
- II. Mechanical Systems 60
- NOTE: The EC-60 62
- Contact Bendix 65
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