System layer
Sense
Wheel-speed sensors and electrical inputs establish what each wheel and axle is doing.
Wheel speed · load state · driver demandSystems & application engineeringEvery component has
Every component has
a system consequence.
TCS structures the technical conversation from vehicle definition to release: architecture, interfaces, component selection, installation evidence and controlled change.
01System anatomy
From sensed condition to controlled brake force.
A trailer braking system is a chain of decisions and energy transfer. Reliability depends on every interface in that chain—not only the headline valve or controller.
The six-layer model below gives engineering, purchasing, quality and service teams a common language for reviewing the application.
System layer
Decide
ABS or EBS logic interprets the inputs and determines the required brake response.
ECU · configuration · diagnosticsSystem layer
Modulate
Electro-pneumatic and pneumatic valves translate control demand into managed air pressure.
Modulators · relay valves · protectionSystem layer
Transmit
Air lines, cables, reservoirs and connectors carry energy and information across the trailer.
Routing · ports · voltage · pressureSystem layer
Actuate
Brake chambers, slack adjusters and linkages convert pressure into mechanical wheel-end force.
Stroke · geometry · clearance · forceSystem layer
Verify
Installation, response, fault behaviour and documentation are checked before programme release.
Inspection · test · evidence · change controlApplication definition
The questions that change the answer.
Selection becomes dependable when the application is described in enough detail for each interface to be reviewed.
What is being built?
- Trailer type and operating region
- Axle count, spacing and steering
- Gross and axle load targets
- New build, retrofit or replacement
How should it behave?
- ABS or EBS architecture
- Number of sensing and modulation channels
- Lift-axle and suspension logic
- Diagnostics and communication needs
What must connect?
- Port threads and flow direction
- Voltage, connectors and pinning
- Mounting envelope and orientation
- Cable, hose and linkage routing
What must it withstand?
- Operating pressure and temperature
- Road, dust, water and vibration exposure
- Load cycle and annual utilisation
- Service access and replacement strategy
Programme governance
Six gates from enquiry to supply.
Each gate creates a reviewable output. This keeps assumptions visible and prevents an unconfirmed reference from quietly becoming a production specification.
Input completeness
Vehicle definition, duty, axle and suspension layout, current circuit and target outcome.
Architecture review
Functional diagram, product roles, interfaces, system boundaries and open technical risks.
Component confirmation
Part references, ports, connectors, voltage, pressure, mounting and environmental needs.
Sample readiness
Controlled sample list, installation guidance, inspection criteria and deviation record.
Validation evidence
Fitment feedback, functional checks, test results, faults, corrective actions and revisions.
Supply release
Approved configuration, commercial scope, forecast, traceability and change-notification route.
Technical evidence pack
What a customer programme can request.
The exact document set depends on product maturity, source and customer requirements. TCS confirms availability during application review.
Part identity, functional description, interface data, reference values and application boundary.
Mounting, orientation, port or connector identification, routing considerations and cautions.
Incoming checks, visual criteria, dimensional or functional characteristics and traceability fields.
Fitment, leakage, pressure response, electrical behaviour, environmental or endurance checks as applicable.
Revision status, deviations, corrective actions and customer notification for controlled programme changes.
Identification guidance, diagnostic inputs, replacement checkpoints and escalation route.