Meritor/WABCO Trailer (and Truck) ABS
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Meritor WABCO has been a trailer ABS technology leader since 1993, offering ABS as standard equipment at all major trailer OEMs.
Enhanced Easy-Stop ABS provides trailer-monitoring and control capabilities to fleets and owner-operators with systems configurations to meet any trailer application – basic, standard and premium. 2SM/1M Basic: Two-sensor/one-ABS relay valve system provides increased stability while meeting FMVSS 121 requirements. Recommended for converter dolly and semi-trailer applications. 2S/2M Standard: Two-sensor/two-ABS relay valve system delivers extra control and stability with increased protection against tire flatspotting. Valves can be serviced individually. Recommended for single- and tandem-axle semi-trailers. 2M Premium: Choice of two or four sensors. A third relay valve is available on the four-sensor model. Recommended for tandem-axle semi-trailers, multi-axle or full trailers. If your trailer already uses Easy Stop, why should you upgrade to Enhanced Easy Stop? Enhanced Easy Stop adds a very important feature, PLC, that allows monitoring of the system from the cab. Also, the enhanced system allows the ECU and modulator valve to be serviced individually.
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 Enhanced Easy-Stop 2S-2M combined ECU and relay valve
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 pn R955344 Enhanced Easy Stop ECU/Valve Replacement Kit  pn R955459 sensor clip  pn R955336 Right angle ABS wheel sensor, cable & clip |
Typical Trailer ABS Piping Diagram WABCO Easy Stop Trailer ABS ECU & modulator valve with Sealco spring brake valves. Note that separate relay valve is not necessary. |
Meritor WABCO ABS parts currently in stock
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| ECU |
| | S4008506000 | trailer |
| | Enhanced Easy-Stop 2S/2M (after 3/1/01) |
| | S4461082010 | trailer |
| | Enhanced Easy-Stop 2S/1M Basic with bracket (after 3/1/01) ECU only |
| | S4008506027 | truck |
| | 4S/4M cab mounted tractor SAE J1939, PLC, Basic ECU |
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| ECU+valve |
| | R955320 | trailer |
| | Easy Stop Upgrade for 2S/2M, 4S/2M w. power adapter cable |
| | OEM pn: S472 500 012 0 |
| | R955321 | trailer |
| | Easy Stop Upgrade for 2S/2M, 4S/2M w. power + diagnostic cable adapter |
| | OEM pn: S472 500 012 0 |
| | R955322 | trailer |
| | Easy Stop Upgrade for 2S/1M (steerable axle trailers) w. power cable |
| | OEM pn: S472 500 011 0 |
| | R955344 | trailer |
| | Easy Stop Upgrade for 2S/1M (standard trailers) w. power adapter cable |
| | OEM pn: S472 500 021 0 |
| | S4005001010 | trailer |
| | Enhanced Easy-Stop 2S/1M Basic with bracket (after 3/1/01) |
| | Haldex AQ960503, Stoughton, Trailmobile, Utility trailers |
| | S4005001020 | trailer |
| | Enhanced Easy-Stop 2S/2M (after 3/1/01) |
| | Stoughton trailers |
| | S4005001030 | trailer |
| | Enhanced Easy-Stop 2S/2M, 4S/2M, 4S/3M Premium (after 3/1/01) |
| | Stoughton, Trailmobile, Utility, Winston trailers |
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| modulator valve |
| | S4721950050 | tractor |
| | 1/2" inlet & outlet, Kostal style connector |
| | S4721950940 | tractor |
| | 1/2" inlet & outlet, bayonet style connector |
| | S4725000032 | tractor |
| | Tractor ABS modulator valve |
| | replaces 472 195 082 0 |
| | R955378 | trailer |
| | 2 x 3/4" supply ports, 4 x 3/8" delivery ports, 3-4 psi crack press. 2M/3M systems |
| | S4721950320, S4721950270,S4721950260, S4721950230, |
| | S4721950330 | trailer |
| | for 3M Enhanced Easy-Stop or 2M/3M Easy-Stop Units on standard trailers |
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| wheel sensor |
| | R955327 | general |
| | 11' cable, 90° sensor, clip & grease packet |
| | OEM pn: S441 032 092 0 |
| | R955329 | general |
| | 5.6' cable, straight sensor, clip & grease packet, typical for front axles |
| | OEM pn: S441 032 919 0 |
| | R955335 | general |
| | 1' cable, 90° sensor, clip & grease packet |
| | OEM pn: S441 032 808 0 |
| | R955336 | general |
| | 3' cable, 90° sensor, clip & grease packet |
| | OEM pn: S441 032 809 0 |
| | R955337 | general |
| | 5.8' cable, straight sensor, clip & grease packet, typical for front axles |
| | OEM pn: S441 032 444 0 |
| | R955341 | general |
| | 5.8' cable, 90° sensor, clip & grease packet |
| | OEM pn: S441 032 813 0 |
| | R955342 | general |
| | 6.6' cable, 90° sensor, clip & grease packet |
| | OEM pn: S441 032 814 0 |
| | R955349 | general |
| | 6.6' cable, straight sensor, clip & grease packet, typical for front axles |
| | OEM pn: S441 032 971 0 |
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| sensor cable |
| | S4497130180 | general |
| | 6 ft. 2-wire sensor cable |
| | S4497130300 | general |
| | 10 ft. 2-wire sensor cable |
| | S4497130500 | general |
| | 16 ft. 2-wire sensor cable |
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| sensor clip |
| | R955459 | general |
| | Copper-beryllium sensor clip includes grease packet, .63" id 1.18" length |
| | S8997598154 | general |
| | Chrome nickel sensor clip and grease packet. |
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| power cable |
| | S4493260050 | general |
| | 1.65' power cable enhanced easy stop 4 conductor |
| | S4493260300 | general |
| | 10' power cable enhanced easy stop 4 conductor |
| | S4493260470 | general |
| | 14' power cable enhanced easy stop 4 conductor |
| | S4493260600 | general |
| | 20' power cable enhanced easy stop 4 conductor |
| | S4493281100 | general |
| | 36' power cable enhanced easy stop 4 conductor w. 4 bare wires at one end |
| | S4493641420 | general |
| | 1.65/10' power cable enhanced easy stop "Y" style for diagnostic connector |
| | S4493641430 | general |
| | 3/10' power cable enhanced easy stop "Y" style for diagnostic connector |
| | S4493641500 | general |
| | 13/10' power cable enhanced easy stop "Y" style for diagnostic connector |
| | S8946060370 | trailer |
| | 1.27 ft., Easy stop 4 conductor pigtail w. harness connector |
| | S8946060380 | trailer |
| | 14 ft., Easy stop 4 conductor pigtail w. harness connector |
| | S894606050-0 | trailer |
| | 20 ft., Easy stop 4 conductor pigtail w. harness connector |
| | S8946062752 | trailer |
| | 1.65' extension connects relay valve to ECU (.5M) |
| | S8946073120 | trailer |
| | adapter connects Easy Stop Power cable to enhanced ES ECU |
| | S8946073130 | trailer |
| | Easy Stop Power/Diagnostic Adapter cable |
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| relay valve |
| | S4725000062 | tractor |
| | Tractor ABS relay valve |
| | replaces 973 011 021 0 |
| | S4725000072 | tractor |
| | Tractor ABS relay valve |
| | replaces 973 011 022 0 |
| | S9730119212 | tractor |
| | fits 4S/4M and 6S/4M rear axle ABS systems |
| | replaces 973 011 026 0 |
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| Other |
| | R955367 | general |
| | 12v solenoid valve |
| | S4325000050 | trailer |
| | In line filter mounted near gladhand to prevent contamination of trailer air supply |
