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BRAKE BINDINGBrake binding is a

phenomenon of binding of

wheels by brake blockswhen the loco pilots brake

valve is in release position.

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Train running heavy with push backtendency.

Train does not move during startingon prescribed notch/current.

Rise in temperature and emission ofsmoke from affected wheels.

Unusual sound due to binding ofwheels by brake blocks.

Skidding of wheels on rail.

SIGNS & SYMPTOMS

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MAIN CAUSES Defective DV/mal functioning of DV. Air leakage from DV, AR, Dirt

collector, angle COC and branchpipes.

Jamming of brake cylinder piston. Jamming of brake gear levers, pins,

brake beam hangers etc. Hand brake is in applied condition.

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1) BRAKE PIPE2) FEED PIPE3) BRAKE CYLINDER4) AUXILARY RESERVIOR5) ISOLATION COCK WITH FILTER6) DISTRIBUTOR VALVE7) CONTROL RESERVIOR8) ISOLATING COCK

9) CHECK VALVE WITH COCK & ISOLATING COCK10) CUT OFF ANGLE COCK11) HOSE COUPLING FOR BRAKE PIPE12) HOSE COUPLING FOR FEED PIPE13) EMERGENCY BRAKE VALVE14) MANUAL RELEASE15) PASS.EMERGENCY ALARAM VALVE ASSEMBLY16) PRESSURE GAUGE

SCHEMATIC DIAGRAM FOR AIR BRAKE

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ONLY ONE TROLLY AFFECTED

Binding with BK.Cyl inrelease condition

Binding with BK.Cyl inoperative condition

Rotate SAB

SAB rotating SAB stuck up

Release BKrigging by

rotatingSAB

Release BKrigging by

removing palmend pin

Dummy BK cyl. Worktrain upto destination

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Binding with BK.Cyl in operative condition

Operate QRV of DV

If BK cyl. released

Isolate BK cyl.isolating cock

Isolate FP & AR isolating cock,Isolate the DV and pull QRV

If pistonreleases

If BK cyl. Does not release

Leave DV in isolatecondition

If piston does notrelease

Isolate BK cyl. And pulldrain plug of BK cyl

QRV

ROTATE TOISOLATE DV

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BOTH TROLEYS AFFECTEDOperate QRV of DV

If piston released

Isolate BKcyl. & DV

Isolate FP & AR isolatingcock, isolate DV & Pull

QRV again

If piston does notrelease

If pistonreleased

Leave DV inisolatingcondition

If piston does notrelease

Open AR draincock & if pistondoes not release

Isolate both cyl.&

open drain plugof BK cyl.

ROTATE TOISOLATE DV

QRV

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BMBS TROLLEYS AFFECTED

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STEPS TO RELEASE

BRAKE BINDING

STEP-1

STEP-2

Close isolating cock ofBP & FP branch pipe line

Isolate DV by moving thehandle from vertical to

horizontal position & secure

BP

FP

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STEP-3Release DV by pulling QRV

till all the air escapedThrough DV

STEP-4 Close both bogie brakeIsolating cocks

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STEP-5Pull out the clutch &

rotate spindle rodclock wise to

release the piston

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FOR SLRCOACHES

Check hand brake andensure gap between

wheel and brake block.

Reset the PEAV & if notsuccess isolate thePEAV isolating cock

IF ACP ONCOACHES

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AIR BARKE SYSTEM ON LHB COACHES

(Axle Mounted Disc Brake)

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Axle mounted

brake disc

Brakecalipers

Brake Pads

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Brake

Cylinder

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QRVHANDLE

QRV

DV

Pull QRV handle to release controlreservoir pressure. If brakes released

brake indicator will turn red to green.

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FEED PIPEISOLATING

COCKCDTS

ISOLATINGCOCK

BOGIE-1ISOLATING

COCK

BOGIE-2ISOLATING

COCK

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KNORR BREMSE BRAKE CONTROL PANEL

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SAB WABCO BRAKE CONTROL PANEL

FEED PIPEISOLATING

COCK

Turn the FP cock horizontal tovertical to Isolate feed pipe supply

to aux. reservoir.

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75 lt. ARFor CDTS25 lt. AR for

brake system

ARDrain cock

Open the drain cock of Aux. reservoir todischarge the full pressure then close it.The brake indicator will turn to green if

brake binding is due to pneumatic failure.

l b b l b h b

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SAB WABCO BRAKE CONTROL PANEL

BOGIE-1ISOLATING

COCK

BOGIE-2ISOLATING

COCK

Isolate bogies by isolating both bogie cut outcock, put FP in service and work the train.

The affected coach will run as piped vehicle.

FEED PIPEISOLATING

COCK

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RESETING OF ACP

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ACP RESETING PROCEDURE

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SALIENT FEATURESWORKING PRINCIPLE OF

BMBS WAGON

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6 T l l k dj i i i 500 i l di

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6- Total slack adjusting capacity is 500 mm includingbrake block wear, wheel wear and all clearances.

7- All cylinders are equipped with an automatic pistonstroke indicator.

8- Replacement of the brake head is quickly and easyby removal by only one pin.

9- Provision of mechanical hand brake system with theuse of two nos stainless hand brake cables pulledthrough standard hand brake rigging.

10- Easy fitment of bogie mounted cylinder on anys tandard bogies without making any modifications.

ADVANTAGES OF BMBS OVER CONVENTIONAL

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ADVANTAGES OF BMBS OVER CONVENTIONALBRAKE SYSTEM

1-SAB is eliminated providing in built slack adjuster totake up slack automatically.

2- Brake Rigging completely eliminated.3- Wt of BK system Reduced approx: 300 Kg resulting

more carrying capacity.4- E/L system Modified to Automatic Load sensing hence

there is no L/E handle.5- Mechanical efficiency ( Brake percentage) Increased

to 47.6% ( was 43.8% in case of BOXN)6- Push Rod of conventional type eliminated BK rigging

eliminated so there was a low chance of hanging

parts in Train.

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Brake cylinder with double actingslack adjustment feature.

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DV in service

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Piston stroke

indicator

When BP reduced, piston moves outwardand the indicator comes out from the BC.

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DV in isolated condition and manuallyReleased

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Piston moves insideand the indicator also moves inside.

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Automatically changes the BC pressure 3 8kg/cm2 /

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APM (EL-60 Valve)

Automatically changes the BC pressure, 3.8kg/cm2 /2.2kg/cm2 depending upon loaded / empty

condition. Installed between Distributor Valve and

Brake Cylinder. Physical contact of lever with sideframe only during braking.

Mounted on under frame, takes Deflection

of Bolster taken against side frame.

I di id l b gi b i l t d b i l ti g th

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Individual bogie can be isolated by isolating thecorresponding bogie COC.

Normal positionof bogie COC

Individual bogie can be isolated by isolating the

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Individual bogie can be isolated by isolating thecorresponding bogie COC.

Isolated positionof bogie COC

During single pipe operation the FP can be

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During single pipe operation the FP can beisolated by FP COC.

Isolated positionof FP COC

P i i f h i l h d b k

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DV

Provision of mechanical hand brakesystem with the use of two numbers

stainless hand brake cables pulledthrough standard hand brake rigging in

one trolley only.

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Mechanical arrangement for

Hand brake.

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To apply hand brake rotate the wheel

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DV

To apply hand brake rotate the wheeltowards DV. (on either side)

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As an indication the piston stroke

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As an indication the piston strokeindicator will comes out.

To release hand brake rotate the wheel

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DV

To release hand brake rotate the wheelopposite to DV. (on either side)

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As an indication the piston stroke

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As an indication the piston strokeindicator will go inside.

To ensure the hand brake application

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To ensure the hand brake applicationcheck the brake blocks are griping on

the wheel of corresponding trolley .