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TRPBrake Shoes What’sStopping You?
TRUSTED . RELIABLE . PROVEN
At TRP, we stand by our products 100%.
That’s why when we developed the latest generation brake shoe, we wanted to make sure that they stand up against any aftermarket shoe on the market.
To do this we commissioned a number of tests on aftermarket and OEM shoes to see how the TRP brake shoe compared. The standard that we tested to was
FMVSS 121, an industry recognised standard that tests whether a friction material has suf f icient frictional characteristics to be safe on a given application.
The following shows how the Standard (21K GAWR) and Premium (23K GAWR) TRP Linings performed when tested to FMVSS 121. For comparison, the OEM results are also included.
NOT ALL AFTERMARKET BRAKES ARE CREATED EQUAL…
TRUSTED . RELIABLE . PROVEN
WHAT IS FMVSS 121 STANDARD?FMVSS 121 stands for Federal Motor Vehicle Safety Standard 121 which tests whether a given friction material has sufficient frictional characteristics to be safe on a given application. FMVSS 121 is not a comparison of premium and standard linings. It is a measure of each product as it relates to the standard.
WHY TEST TO FMVSS 121 STANDARD?Testing TRP shoes to the FMVSS 121 standard ensures that the linings are put through standardised testing. It verifies that the lining passes a set criteria at a given weight load. Australian and New Zealand vehicle standards are for the fully dressed axle, so it is important that we use a recognised standard like FMVSS 121 to test the performance of the friction material.
MATERIAL TESTED AND TEST PARAMETERSThe test was performed by Link Manufacturing, an independent testing facility based in the US. The FMVSS 121 test was performed on the following Linings:
Standard Lining (21K GAWR) TRP21K Lining Material
Premium Lining (23K GAWR) TRP23K Lining Material
TESTING PARAMETERS
• Air Brake Chamber 30/30 • Slack adjuster 5.5″ • Factor 165* (30″ x 5.5″)
*It’s important to note that we tested to factor 165 for both standard and premium linings. The factor is calculated by multiplying the slack adjuster arm length by the air chamber diaphragm size. (30 x 5.5 = 165). We test to this factor as most class 8 trucks use a 5.5” slack adjuster and a 30/30 air chamber.
TESTING PARAMETERS FMVSS 121 STANDARD
FMVSS 121
TRUSTED . RELIABLE . PROVEN
Standard Lining 21K Comparison
*Only TRP and OEM test results shown on the 21K comparison due to a fail result on the aftermarket competitor lining tested.
TRUSTED . RELIABLE . PROVEN
FMVSS 121 TEST STANDARD LINING (21K) COMPARISON
RETARDATION FORCEMore force is better: A greater force applies more friction in order to decelerate
WHAT WE LEARN FROM THE TEST?
▌ Confirms that TRP linings are able to create sufficient friction through all of the air chamber pressure ranges in the test parameters.
TESTING PROCEDURE
▌ 7 stops made at 20 30 40 50 60 70 and 80 PSI.
▌ Stops are made from 80kph to 0 kph.
▌ Average torque is measured during each stop to calculate a retardation ratio which has to be above the legal limit at each pressure.
0.5
0.4
0.3
0.2
0.1
0.0
0.6
20
RE
TAR
DA
TION
PSI30 40 50 60 70 80
Min Limit
TRP
OEM
TRUSTED . RELIABLE . PROVEN
FADE PERFORMANCELess is best: Simulates 10 continuous, abrupt decelerations
WHAT WE LEARN FROM THE TEST?
▌ As linings get hotter, more force (PSI) from the air chamber is needed to create enough friction in order to stop. The test results show TRP linings are able to maintain sufficient friction as the temperature of the lining increases.
TESTING PROCEDURE
▌ A series of 10 snubs are made from 80 kph to 25 kph.
▌ Air pressure and temperature are recorded during these stops.
▌ Air pressure may not exceed 100 PSI during fade.
FMVSS 121 TEST STANDARD LINING (21K) COMPARISON
120
1
PS
I
100
80
60
40
20
02 3 4 5 6 7 8 9 10
POWER STOPS
Max PSI TRP OEM
300
1
TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
02 3 4 5 6 7 8 9 10
POWER STOPS
TRP OEM
TRUSTED . RELIABLE . PROVEN
WHAT WE LEARN FROM THE TEST?
▌ The ability of the lining to continue to create sufficient friction after it has been exposed to the high temperatures in the Fade test.
▌ TRP linings show a steady decrease in temperature and PSI throughout the 20 brake stops.
TESTING PROCEDURE
▌ Test starts 2 minutes after the fade performance testing. 20 braking stops are made, 60 seconds apart, at an average deceleration rate of 3.6m/sec2.
▌ Each of the stops are from 48 kph to 0 kph.
▌ Air pressure is recorded during these stops. Air pressure may not exceed 85 PSI or go lower than 20 PSI during recovery.
RECOVERY PERFORMANCELess is best: Simulates how fast the lining material recovers and improves braking power in less severe conditions
FMVSS 121 TEST STANDARD LINING (21K) COMPARISON
100
1
PR
ES
SU
RE
(PS
I)
80
60
40
20
03 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
RECOVERY STOPS
Max PSI MIN PSI TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
TRUSTED . RELIABLE . PROVEN
Premium Lining 23K Comparison
TRUSTED . RELIABLE . PROVEN
FMVSS 121 TEST PREMIUM LINING (23K) COMPARISON
RETARDATION FORCEMore force is better: A greater force applies more friction in order to decelerate
WHAT WE LEARN FROM THE TEST?
▌ Confirms that TRP linings are able to create sufficient friction through all of the air chamber pressure ranges in the test parameters.
TESTING PROCEDURE
▌ 7 stops made at 20 30 40 50 60 70 and 80 PSI.
▌ Stops are from 80 kph to 0 kph.
▌ Average torque is measured during the stop to calculate a retardation ratio that has to be above the legal limit at each pressure.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
20 30 40 50 60 70 80
RETA
RDAT
ION
PSI
Min Limit TRP OEM Aftermarket Competitor
RETARDATION FORCE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
20 30 40 50 60 70 80
RETARDATION
PSI
Min Limit TRP OEM Aftermarket Competitor
RETARDATION FORCE
TRUSTED . RELIABLE . PROVEN
FADE PERFORMANCELess is best: Simulates 10 continuous, abrupt decelerations
WHAT WE LEARN FROM THE TEST?
▌ As linings get hotter, more force (PSI) from the air chamber is needed to create enough friction in order to stop. The test results show TRP linings are able to maintain sufficient friction as the temperature of the lining increases.
TESTING PROCEDURE
▌ A series of 10 snubs are made from 80 kph to 25 kph, the first snub starting at under 95°.
▌ Air pressure and temperature are recorded during these stops.
▌ Air pressure may not exceed 100 PSI during fade.
FMVSS 121 TEST PREMIUM LINING (23K) COMPARISON
0
100
200
300
400
500
600
1 2 3 4 5 6 7 8 9 10
Tem
pera
ture
(Cel
sius
)
Power Stops
TRP OEM Aftermarket Competitor
FADE PERFORMANCE
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8 9 10
PSI
Power Stops
Max PSI TRP OEM Aftermarket Competitor
0
100
200
300
400
500
600
1 2 3 4 5 6 7 8 9 10
Tem
pera
ture
(Cel
sius
)
Power Stops
TRP OEM Aftermarket Competitor
FADE PERFORMANCE
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8 9 10
PSI
Power Stops
Max PSI TRP OEM Aftermarket Competitor
300
1
TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
02 3 4 5 6 7 8 9 10
POWER STOPS
TRP OEM
300
1
TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
02 3 4 5 6 7 8 9 10
POWER STOPS
TRP OEM100
1
PR
ES
SU
RE
(PS
I)
80
60
40
20
03 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
RECOVERY STOPS
Max PSI MIN PSI TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
TRUSTED . RELIABLE . PROVEN
WHAT WE LEARN FROM THE TEST?
▌ The ability of the lining to continue to create sufficient friction after it has been exposed to the high temperatures in the Fade test.
▌ TRP linings maintain a steady temperature and PSI throughout the 20 brake stops.
TESTING PROCEDURE
▌ Test starts 2 minutes after the fade performance testing. 20 braking stops are made, 60 seconds apart, at an average deceleration rate of 3.6m/sec2.
▌ Each of the stops are from 48 kph to 0 kph.
▌ Air pressure is recorded during these stops. Air pressure may not exceed 85 PSI or go lower than 20 PSI during recovery.
RECOVERY PERFORMANCELess is best: Simulates how fast the lining material recovers and improves braking power in less severe conditions
FMVSS 121 TEST PREMIUM LINING (23K) COMPARISON
RECOVERY PERFORMANCE
0
20
40
60
80
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Pres
sure
(PSI
)
Recovery Stops
Max PSI Min PSI TRP Aftermarket Competitor OEM
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Tem
p (C
elsiu
s)
Recovery Stops
TRP OEM Aftermarket Competitor
RECOVERY PERFORMANCE
0
20
40
60
80
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Pres
sure
(PSI
)
Recovery Stops
Max PSI Min PSI TRP Aftermarket Competitor OEM
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Tem
p (C
elsi
us)
Recovery Stops
TRP OEM Aftermarket Competitor
100
1
PR
ES
SU
RE
(PS
I)
80
60
40
20
03 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
RECOVERY STOPS
Max PSI MIN PSI TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
300TEM
PE
RA
TUR
E (C
EL
SIU
S)
250
200
150
100
50
0
RECOVERY STOPS1 3 5 7 9 11 13 15 17 192 4 6 8 10 12 14 16 18 20
TRP OEM
TRUSTED . RELIABLE . PROVEN
“WHY SHOULD I BUY TRP BRAKE SHOES?”
FAQ
“WHY SHOULD I CARE ABOUT FMVSS 121 TESTING?”
Testing TRP shoes to the FMVSS 121 standard ensures that the linings are put through standardised and industry accepted testing. It verifies that the lining passes a set criteria at a given weight load and helps us benchmark TRP shoes against others in the market. Australian and New Zealand vehicle standards are for the fully dressed axle, so it is important that we use a recognised standard like FMVSS 121 to test the performance of the friction.
The test results speak for themselves. Not only do TRP Brake Shoes offer fantastic value for money, we have also bench tested our shoes against other brands and found that our TRP linings are comparable to the best in the market. Along with testing to FMVSS 121 standard, TRP also test to ECE R90 certification where applicable, a recognised standard in Australia and New Zealand.
“SHOULD I USE STANDARD “ OR PREMIUM LININGS?”
“WHAT WARRANTY DO YOU OFFER?”
“SO WHAT ABOUT “ THE CHAIN OF RESPONSIBILITY?”
It depends on what application you are going to use the shoes in. As a rule of thumb, most trailer applications use standard linings whilst truck applications use a premium lining. Your dealer will help you pick the right lining for your application.
TRP back the shoes with a 12 month, unlimited kilometre warranty against manufacturing defects.
TRP take the chain of responsibility very seriously. All certification and standards are adhered to and we also independently test wherever possible. The TRP brake shoes for example are tested to FMVSS 121 standard and ECE R90 certification where applicable. FMVSS 121 ensures that the friction material passes a set standard, whilst ECE R90 tests the friction material to ensure it is within 15% of the OEM lining. These are both recognised and accepted industry wide.
