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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 .