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1 710 109 Scania CV AB 2001, Sweden10:00-01Issue 2 enBrake Diagram Manual5151MAD 16

22212324B6B5B1BCG 8BCF 12PBX 12PBU 6PBV 12

PBZ 12PBS 8PBT 6FBR 8SAP 6SAR 6SAS 12B4A4B1A5A6A2

A3B2A1B5B6BKBAGPCFPO81212

6PA 12PCPKFBSSKSXSC868612

12MP 6MK 6

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MU 8PH 6BAF 12BAG 12FAG 12FBC 12SK 6

PK 6BCC 6FAF 12FBO 6XCF 12PO 6XCE 12B3FA 12FAV 12XM 12PA 12

BA 12AB1122334455

665 63 41 2AB 5 63 41 2BCK 12XCJ 12BC 1228 5261d7k3537455 137d58a837d7c19

323232

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55121710a658416

16327b55552319b57 58b2555274

274MA 16MAM 6PG 6PE 8 PC 8MAO 16FB 12PCC PCD 1212PX12FBS 12

SJ 6B3PBW 12 PCB 12SCSXBCL 12SAV 8SAU 82122 121142434111 1224 221211112212222

2114

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11 1211 123936 36323632

36325555MBK 12 MBJ 12 MBH 12PD 12 PF 12BL 8BYD 849185555

2727654458cOpt.Opt.1 211 212

10bMV 16Middle valve unit515119212BYB 6791321 24BYC 65555PZ 12 B227411 12102 019

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Contents

Contents

Introduction ...................................................................

............... 3Key to compressed air diagram .................................................................................. 4List of components .................................................................................. 7Position configuration ................................................................................ 24

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Introduction

Introduction

The brake diagram manual complements the

compressed air diagrams and containsinformation required to read and understandthem.

The booklet comprises a list of components withinformation on the components in thecompressed air system. The information coversthe designation, description, function andsymbol of each of the components. Anillustration is also provided showing the actualappearance of the component.

Finally, the booklet contains the positionconfiguration. The figure shows an example ofhow the components can be located in a vehiclewith 6x4 A/B ABS (6-channel).

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Key to compressed air diagram


The compressed air diagram consists of a

skeleton diagram with symbols for the variouscomponents. It shows only how the variouscomponents are connected to one another, notwhere the components are located or how thecompressed air lines are routed in the chassis.Pipe connections and joints are not displayed inthe diagram either.

Beside each symbol is a designation, which alsocan be found in the list of components in this

booklet. If several components have the same

13 35

function, they have the same symbol butdifferent designations.ExampleThe task of a safety valve is always to open if

the pressure in a circuit becomes too high. Forthis reason, the symbol for safety valve in the Safety valve Safety valvediagram is always the same. However, a valvethat opens at 14.3 bar has number 13, while one

14,3 bar 19 barthat opens at 19 bar is designated as 35 (seefigure).


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In certain cases, components are differentiatedby placing a letter after the number, dependingon what they are used for.

Example

7c is the designation for the front circuit air tankand 7d is the designation for the rear circuit airtank (see figure).

7d7c104 723

104 727

10 2651

Next to each line on the diagram is a marking inthe form of two or three letters, as well asinformation on the diameter of the line. The linemarking indicates which circuit the line belongsto, where it originates and where it runs to. Themarking can also be found on the line in thevehicle.

Example

The designation MAD16 indicates a linebelonging to the supply circuit running from the

compressor to the cooling coil. This has adiameter of 16 mm. These markings areexplained in more detail in booklet 10:02-08,Marking of compressed air lines andconnections.

MAD 16104 724Optional equipment is drawn in a box withbroken lines on the diagrams.

Components that constitute a single unit aredrawn in a dashed and dotted frame.


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The air connections indicated on the symbolsare marked with a number describing what each

4

connection is intended for. The designation forIntake is normally 1. If there are two intakes,they are designated 11 and 12. Outlet isnormally designated 2; if there are several theyreceive the numbers 21, 22, 23 etc. Number 3 is

21

3

22

1a vent and 4 a connection for control air.

10_2679

Air dryer1 Intake21 Outlet to four-circuit protection valve22 Outlet to regeneration air tank3 Vent port4 Control air to compressor.

Electrical cable

The symbol shows that the component has anelectrical function.


104 730

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List of components

List of components

Compressed air lines

FunctionUnder normal operating conditions, conveys full supply pressure. The pipecan be made of plastic or steel.Under normal operating conditions, conveys a variable control pressure. Thepipe can be made of plastic or steel.The pipe consists of a rubber hose. A coiled hose is used for the trailerconnection.The cooling coil consists of a steel pipe wound in a spiral. It is located afterthe compressor and its function is to cool the compressed air.Symbol

104 72804 72910 265310_2654104 731104 732DesignationSupply pipeControl pipeFlexible pipeCooling coilJoined pipesIntersecting pipes


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List of components

Components

Illustration

10_268810_2689105938FunctionThe compressor compresses air forvarious compressed air systems. 0 Intake 2 Outlet 4 control air to the compressorrelief valve.The brake chamber applies the forceof the compressed air to the servicebrake.The air tank holds a supply of

compressed air for the variouscompressed air circuits.Symbol10 265502411 10 265610 2657DesignationCompressorBrake chamberBrake system airtank 7b parking

7c front circuit 7d rear circuit 7k air dryerNo.347


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List of components

Illustration10 2690b105775Function

The low pressure indicator is anelectrical monitor that closes if thepressure drops below a certain value.It is connected to a buzzer and awarning lamp to warn if the airpressure is too low.The service brake valve is actuated bythe brake pedal and releases operatingair to the brake control system.The safety valve opens when thepressure exceeds a set value in orderto protect the system fromoverpressure.Symbol10_2658

10 265911 21221210_2660DesignationLow pressureindicator 10a parking andtrailer brakesupply pressure(5 bar) 10b parkingbrake controlpressure (6 bar)Service brake valveSafety valve,14,3 barNo.

101213


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List of components

Illustration10_2691102 091105 891Function

The pressure sensor, which is anelectrical sensor, is connected to anindicator enabling the pressure in thesupply pipes for the service brakecircuits to be read off. The monitor,which closes when the pressure dropsbelow a certain value (5 bar), isconnected to a warning lamp and abuzzer to warn if the air pressure istoo low.The brake lamp switch ismechanically actuated and closeswhen the brake pedal is depressed,

lighting the brake lights.The quick release valve is used forrapid draining of the parking circuitpressureand for applying the parkingbrake.Symbol10 2661PP104 81910 2663122DesignationPressure sensor with

monitorBrake lamp switchQuick release valveNo.161718

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List of components

Illustration10_2694FunctionThe relay valve is a compressed-air

controlled valve directly connected tothe supply pressure and directs thisproportionally in relation to thecontrol signal (4). 19 is used for quicker applicationand release of the wheel brakes. 19a acts as a switch control valve,preventing braking of the tag axleduring TC control. 19b is integrated with a checkvalve. The purpose of the checkvalve is to prevent the parkingbrake being applied if there is nopressure in the tank for the

parking and trailer circuits. 19c is used in vehicles withdouble front axles. It has a quickrelease function. 19d has an opening pressure of0.42 bar.Symbol10_26641 422DesignationRelay valve 19 rear circuit 19a is fitted on

certain vehicleswith tag axle andTC 19b parkingcircuit 19c front circuit 19d rear circuitNo.19


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List of components

Illustration105 890106205106206

10620706101 20610106 775FunctionUsed to apply the trailer brakeseparately. The valve has a microswitch that closes when the valve isactuated, lighting the brake lights.

The double check valve opens for thesupply air connection with the highestpressure.The trailer brake couplings connectthe vehicle and trailer control andsupply lines for the trailer brakecircuit.An electrically controlled instrumentshowing the pressure in the front andrear circuits.Symbol10 26652113

210_26661 110 265310 2667DesignationTrailer brake manualcontrol valveDouble check valveTrailer brakecouplingIndicatorNo.20d232526


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List of components

27 Spring brakechamberThe spring brake chamber has acompression spring for applying theparking brake. The brake is releasedby compressed air.28 Parking circuitpressurizing valve

Used to pressurize the parking circuitand so release the parking brake.32 Drain valve The drain valve is located at thebottom of the air tanks and is used fordraining the tanks.35 Safety valve, 19 bar The purpose of the safety valve is toprotect the compressor againstoverload by opening when thepressure exceeds the set value.No. Designation Symbol Function Illustration10_26681211

10 2669106 24410_267010_266010:00-01 Scania CV AB 2001, Sweden

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List of components

Illustration10593810_2698b106150b106151

FunctionThe air tank is a store of compressedair for vehicles with air suspensionand load handling.The overflow valve is used onvehicles with extra air tanks for loadhandling.The purpose is to protect the brakesystem if the pressure drops in theload handling tanks, and to supply thebrake system with air before the loadhandling tanks are filled.The load sensing valve controls thebrake pressure to the rear circuit. It iscontrolled by an outer arm. A heavy

load yields a high brake pressure anda light load yields a lower brakepressure to the rear axle.The load sensing valve controls thebrake pressure to the rear circuit. It iscontrolled by the bellows pressure ofthe drive shaft. A heavy load yields ahigh brake pressure and a light loadyieldsa low brake pressure to the rearaxle.Symbol10 2657 10 2672121 210_2673

1 24106184DesignationAir suspension loadhandling tankOverflow valveLoad-sensing valve,type 1, for vehicleswith leaf springsuspensionLoad-sensing valve,type 2, for vehicleswith air suspensionNo.36394949


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List of components

Illustration102 010116 999Function

The load sensing valve controls thebrake pressure to the rear circuit. Vehicle with leaf springsuspension: The brake pressure tothe rear circuit is controlled by anouter arm. Vehicle with air suspension: Thebrake pressure to the rear circuitis controlled by the bellowspressure of the drive shaft.A heavy load yields a high brakepressure and a light load yields a lowbrake pressure to the rear axle.The control valve regulates thepressure to the brake chambers, so

preventing wheel locking.The control valve is also used for TCcontrol.Symbol1 210_26731 2410618410 26741 2DesignationLoad-sensing valve,

type 3, for vehicleswith air and leafspring suspensionABS control valveNo.4951


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List of components


The interlock valve closes when thepressure drops below a certain valueand can then only be opened manuallywhen the system is pressurized again.The purpose of the interlock valve isto prevent release of the parkingbrake, which occurs if the parkingbrake valve is in the released positionwhen charging up the pressure in thebrake system.A manometer can be connected to atest connection to check the pressurein a brake circuit.

To charge the compressed air systemfrom another compressed air source,only the outlet by the footstep for thedriver area may be used. This islocated between the compressor andthe air dryer, so that the air passesthrough the air dryer before reachingcomponents sensitive to moisture.Symbol10_26751 210 2669DesignationInterlock valve

Test connection/Pressurizing valveNo.5255


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10:00-01 Scania CV AB 2001, Sweden 1757 Trailer relay valve The relay valve is a compressed aircontrolled valve connected to theparking/trailer circuit supply pressure.The control pressure to the trailer isdirected in proportion to the control

signals from the front and rear brakecircuit as well as from the parkingbrake or trailer brake manual controlvalve.The relay valve is used for quickerapplication and release of the trailerwheel brakes. 11 supply from tank. 12 supply to trailer. 22 operating air to trailer. 41 operating air from rear circuit. 42 operating air from front

circuit. 43 operating air from parking/trailer circuit.58 Pressure limitingvalve 58a exhaustbrake 58b parking/trailer circuit 58c supplycircuit 58a limits the pressure to thevehicle exhaust brake to 6.5 bar.

58b limits the pressure to thevehicle trailer brake and parkingcircuit to 8.0 bar. 58c is used on vehicles with airsuspension at a pressure of 12.2bar in order to limit the pressurefor the brake system to 9.3 bar.No. Designation Symbol Function Illustration12221110 267641 43 4210620010 26771 210 2703List of components

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List of components

Illustration10_2704103 450FunctionThe supply dump valve for the trailer

supply air is connected to the parkingand trailer brake circuits. Togetherwith the manual control valve 61d,without test position, the supply dumpvalve ensures trailer parking brakeoperation with the lever in parkingposition.The valve supplies four circuits withcompressed air. If the pressure dropsin any circuit (e.g. a ruptured line) thefour-circuit protection valve protectsthe remaining circuits fromdepressurising. It also prioritises theair supply to the service brake circuitsand accessories over the parking/

trailer circuit.Used to release the pressure in theparking circuit and so apply theparking brake. It can also be used asan emergency brake.With or without test position.Symbol10 267822212324110 2681132122

DesignationSupply dump valve,USA-adapted brakesystem onT124GA6x4 inMexico.Four-circuitprotection valveParking brakemanual control valveNo.596061d


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10:00-01 Scania CV AB 2001, Sweden 1965 Manifold fitting Used as a manifold on a compressedairline to distribute air to severalcomponents.Note: A manifold fitting may varywidely in design, of which the

illustration shows an example.66 Pressure reductionvalveThe valve is only used on vehicleswith a single bogie and 4-channelABS. It reduces the brake pressure tothe tag axle brake chambers by 50%during ABS control.66a Pressure reductionvalve/front circuit.The valve reduces the pressure to thefront axle on tractors with an axle

distance of 3.3-3.7 m. The reductionis only active if no trailer is coupled.No. Designation Symbol Function Illustration104 818102 01410 26831 24102 0092 1117 781109 810List of components

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List of components

Illustrationb106149106 11710_2706

FunctionThe air dryer removes moisture fromthe air in order to prevent freezing andother operating malfunctions. 1 Intake 21 outlet to four-circuit protectionvalve. 22 outlet to regeneration tank (airtank 7k). 3 Venting 4 control air to compressor.The brake protection valve ensuresthat the rear circuit on vehicles with

air suspension with a load-sensingvalve receive full brake pressure if anair bellows on the drive shaft ispunctured. 1 intake from rear circuit supplysection. 2 connection from drive shaft airsuspension bellows. 3 control air to load-sensingvalve.Symbol22110_267921

3410 2685132DesignationAir dryer withintegrated pressureregulatorBrake protectionvalveNo.7479


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List of components


Electromagnetic valve for controllingcompressed air.81 is used for TC control and isnormally closed.81b is used to release the parkingbrake on the front axle during ELCcontrol. The valve is normally closed.82 is used together with 66 to reducethe pressure on the tag axle duringABS control (only vehicles withsingle bogie and 4-channel ABS). Thevalve is normally open.83 is used together with 58a for theexhaust brake and is normally closed.The buzzer sounds if the air pressurein the front, rear or parking/trailer

circuit becomes too low.The pressure sensor measures thepressure in the drive shaft air bellows.The control unit uses this valuetogether with the value from theservice brake valve in order tocalculate which brake pressure valueis to be activated from the controlmodules.Symbol10 26801210 2684DesignationSolenoid valve

BuzzerPressure sensor, EBSNo.8181b82838486


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22 Scania CV AB 2001, Sweden 10:00-0192 Trailer controlmodule, EBSThe trailer control module ensuresthat the control pressure to the traileris correct. It also balances the

pressure so that the brake adaptationbetween the trailer and the vehicle iscorrect.93 Emergency brakevalve, USA-adaptedbrake system.The emergency brake valve ensuresbraking of the rear wheels via thespring brake if the rear circuit isdepressurised.94 Control module,single EBS

The EBS control unit measures thedriver's required braking power andsends this information to the controlmodules. These then direct air to thebrake chambers. EBS also controlsABS and TC control of the brakes.The control module has an emergencybrake function that is engaged if theelectronics fail.No. Designation Symbol Function Illustration21 12242

4341117 780114 0821057781 42105 221List of components

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List of components

Illustration114 079FunctionThe EBS control unit measures the

driver's required braking power andsends this information to the doublecontrol module. This then directs airto the brake chambers. EBS alsocontrols ABS and TC control of thebrakes.The control module has an emergencybrake function that is engaged if theelectronics fail. The double controlmodule controls the braking of two orfour wheels.Symbol117 0501 4

21 22DesignationControl module,double EBSNo.95


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24 Scania CV AB 2001, Sweden 10:00-016x4 A/B ABS (6-channel)5758b19b23

551610a55792661d 20d52 2884121735

653 7k65556058c137447b 32 7c 7d273639

81 65 251851514983515158a 18105 90410b19,2365Position configuration

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Position configuration

51 ABS control valve52 Interlock valve55 Test connection/Pressurizing valve57 Trailer relay valve58a Pressure limiting valve, exhaust brake58b Pressure limitingvalve, parking/trailer circuit58c Pressure limiting valve, vehicle with air suspension60 Four-circuit protection valve61d Manual control valve, parking circuit

65 Manifold fitting74 Air dryer with integrated pressure regulator79 Brake protection valve81 Solenoid valve, TC83 Solenoid valve, exhaust brake84 Buzzer

3 Compressor4 Brake chamber7b Air tank, parking/trailer circuit7c Air tank, front circuit7d Air tank, rear circuit7k Air tank, air dryer10a Supply pressure low pressure indicator, parking circuit10b Control pressure low pressure indicator, parking circuit12 Service brake valve

13 Safety valve, 14,3 bar16 Pressure sensor with monitor, front/rear circuit17 Brake lamp switch18 Quick release valve19 Relay valve, rear circuit19b Relay valve, parking circuit20d Manual control valve, trailer circuit23 Double check valve25 Trailer brake connection26 Pressure indicator, front/rear circuit27 Spring brake chamber28 Pressurizing valve, parking circuit32 Drain valve35 Safety valve, 19 bar36 Air tank, air suspension39 Overflow valve49 Load-sensing valve


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WSM_0000452_01