A new addition to BSI, we now manufacture a wide range of Air Valve Products. Producing 90 air valve and air treadle assemblies allows us to provide over 900 piece parts and repair kits formerly available from Williams Controls. We also stock many other part numbers as conversions of existing factory products, you can download our current catalog but always feel free to contact us about availability.
| Model Number | Part Number | Description |
| WM43B1 | 111135 | AIR REGULATOR |
| WM80 | 111231 | DOUBLE CHECK AIR VALVE |
| WM80A | 111232 | DOUBLE CHECK AIR VALVE |
| WM87A | 111258 | PRESSURE HOLDBACK |
| WM87C | 111263 | PRESSURE HOLDBACK |
| WM90A | 111276 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90AW | N/A | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90B | 111285 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90BM | 111292 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90D | 111300 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90DA | 111301 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90DB | 111302 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90DM | 111303 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90DT | 111304 | MODULATING CONTROL VALVE, AIR REGULATOR |
| WM90DX | 116697 | FAIL-SAFE PNEUMATIC REG. VALVE |
| WM101CA | 100352 | EMERGENCY RELAY VALVE |
| WM101P | 100361 | EMERGENCY RELAY VALVE |
| WM106A | N/A | MODULATING DASH VALVE |
| WM147BC | 111526 | RELAY VALVE NORMALLY CLOSED 3 WAY |
| WM147C | 111527 | RELAY VALVE NORMALLY CLOSED 3 WAY |
| WM147E | 111530 | RELAY VALVE NORMALLY CLOSED 2 WAY |
| WM147F | 111531 | RELAY VALVE NORMALLY OPEN 3 WAY |
| WM147HC | 111535 | RELAY VALVE NORMALLY OPEN |
| WM147L1 | 130845 | RELAY VALVE NORMALLY CLOSED 3 WAY |
| WM147P | 111542 | RELAY VALVE NORMALLY OPEN 3 WAY |
| WM148A | 111549 | PUSH BUTTON VALVE 3 WAY |
| WM148W | 111531 | PUSH BUTTON VALVE 3 WAY |
| WM219C1 | 111814 | TOGGLE VALVE 3 WAY 2 POSITION |
| WM219C3 | 111816 | TOGGLE VALVE 3 WAY 2 POSITION |
| WM219C4 | 111817 | TOGGLE VALVE 3 WAY 2 POSITION |
| WM224H | 111841 | COMPENSATING HAND VALVE |
| WM227F | 100512 | AIR BRAKE RELAY VALVE |
| WM271A | 111913 | HOSTLER VALVE |
| WM279E1 | 111940 | SELF RELIEVING REGULATOR w / BRACKET |
| WM279R | 111949 | SELF RELIEVING PRESSURE REGULATOR |
| WM279R2 | 117599 | SELF RELIEVING PRESSURE REGULATOR |
| WM279R3 | 111951 | SELF RELIEVING PRESSURE REGULATOR |
| WM292B | 111999 | HIGH VOLUME COMPENSATING RELAY VALVE |
| WM305D1 | 118266 | SINGLE TREADLE / DUAL VALVE |
| WM305-102 | N/A | SINGLE TREADLE / DUAL VALVE |
| WM314B | 112173 | QUICK RELEASE VALVE |
| WM318A | 112201 | TRACTOR PROTECTION VALVE w / ADJUSTABLE RATIO |
| WM320A | 112211 | TRACTOR PROTECTION VALVE |
| WM321 | 112215 | EMERGENCY SAFETY VALVE |
| WM325 | 112229 | PARKING BRAKE CONTROL VALVE |
| WM331C2 | 110227 | FLOOR VALVE |
| WM333S | 112299 | CONTROL VALVE |
| WM338P | 112371 | RELAY VALVE NORMALLY OPEN |
| WM338T100 | 112381 | RELAY VALVE NORMALLY OPEN |
| WM338T101 | 131523 | RELAY VALVE NORMALLY OPEN |
| WM342A | 112405 | ADJUSTABLE SAFETY VALVE 3/8 |
| WM342B | 112407 | ADJUSTABLE SAFETY VALVE 1/4 |
| WM352A | 112468 | MODULATING VALVE HIGH FLOW |
| WM352F | 117983 | MODULATING VALVE HIGH FLOW |
| WM353E | 112479 | INDUSTRIAL TREADLE VALVE |
| WM366A | 112534 | QUICK RELEASE VALVE |
| WM366B | 112536 | QUICK RELEASE VALVE |
| WM371A | 112550 | PUSH BUTTON LEVER |
| WM388-106 | 118090 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM388U1A1A | 117402 | THROTTLE SLAVE |
| WM388U1C2B | 117886 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM388U1C1D | 117888 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM388U1C3D | 119667 | THROTTLE / FAST IDLE |
| WM397J | 100708 | 3 WAY HOLDING VALVE / SEAT CONTROL |
| WM399L | 112799 | DUAL TREADLE BRAKE /THROTTLE VALVE |
| WM412A | 112841 | SHUTTLE VALVE |
| WM413A1 | 130877 | DOUBLE SHUTTLE VALVE |
| WM445 | SERIES | SHIFTER, SHIFT CONTROL, SEQUENCE PROGRAMMER |
| WM453A | 113072 | PNEUMATIC THROTTLE PEDAL |
| WM453B | 113073 | PNEUMATIC THROTTLE PEDAL |
| WM453C | 113074 | PNEUMATIC THROTTLE PEDAL |
| WM453M | 116731 | PNEUMATIC THROTTLE PEDAL |
| WM453M2 | 117903 | PNEUMATIC THROTTLE PEDAL |
| WM453M102 | 119684 | PNEUMATIC THROTTLE PEDAL |
| WM453M110 | 118962 | PNEUMATIC THROTTLE PEDAL |
| WM453N | 117270 | PNEUMATIC THROTTLE PEDAL |
| WM453-110 | 118872 | PNEUMATIC THROTTLE PEDAL |
| WM458B | 113117 | SHIFT SELECTOR VALVE |
| WM459L | 113129 | REGULATOR PANEL |
| WM472A | 113218 | TREADLE VALVE |
| WM472C | 113220 | TREADLE VALVE |
| WM472D | 113222 | TREADLE VALVE |
| WM472E | 113224 | TREADLE VALVE |
| WM476B | 113259 | PNEUMATIC THROTTLE PEDAL |
| WM476C | 113260 | PNEUMATIC THROTTLE PEDAL |
| WM476F5A1 | 117209 | PNEUMATIC THROTTLE PEDAL |
| WM476F5A2 | 130634 | PNEUMATIC THROTTLE PEDAL |
| WM498B | 104474 | TOGGLE VALVE |
| WM498C | 104475 | PUSH BUTTON VALVE |
| WM498P | 106849 | ROCKER VALVE |
| WM498W | 117683 | TOGGLE VALVE |
| WM498-108 | N/A | MULTI-VALVE MANIFOLD PANEL ASSY |
| WM498-603 | 113413 | MULTI-VALVE MANIFOLD PANEL ASSY |
| WM499C | 113470 | AIR STARTER RELAY |
| WM511C | 119130 | HYDRAULIC PROPORTIONAL PEDAL |
| WM512C | 119436 | HYDRAULIC THROTTLE SLAVE |
| WM515C | 119129 | HYDRAULIC THROTTLE CYLINDER |
| WM517A | 119493 | LIFT AXLE CONTROL PANEL |
| WM521A1 | 130300 | AIR CONTROL VALVE |
| WM521B1 | 130424 | AIR CONTROL VALVE SET OF 2 |
| WM521C1 | 130425 | AIR CONTROL VALVE SET OF 3 |
| WM521RA4 | 130940 | AIR CONTROL VALVE REGULATOR |
| WM522A1 | 130386 | JOYSTICK CONTROLLER |
| WM522D1 | 131860 | JOYSTICK CONTROLLER w/ELECTRIC SWITCH IN LEVER |
| WM606C1 | 113724 | COLUMN MOUNTED AIR REGULATOR |
| WM606C1C | 113726 | COLUMN MOUNTED AIR REGULATOR |
| WM606C2 | 113727 | COLUMN MOUNTED AIR REGULATOR |
| WM606C2C | 113730 | COLUMN MOUNTED AIR REGULATOR |
| WM607A1 | 113744 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607B1 | 113754 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607C1 | 113762 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607C1X2 | 100407 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607D1 | N/A | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607E3X2 | N/A | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607B3 | 113760 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM607C3 | 113768 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM617A | 113844 | RELAY VALVE NORMALLY CLOSED |
| WM630-101 | 118393 | RELAY NORMALLY CLOSED AIR/VACUUM |
| WM639A | 113934 | SHUTTLE VALVE |
| WM640A | 113935 | PNEUMATIC TREADLE HORIZONTAL |
| WM642F1 | 117894 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM642F3 | 119142 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM642F5 | 119151 | PNEUMATIC THROTTLE CONTROL CYLINDER |
| WM653C | 113978 | AIR SCALE BLEEDR VALVE STD. LIFT |
| WM653D | 113979 | AIR SCALE BLEEDER VALVE HIGH LIFT |
| WM663A | 113999 | ENGINE SHUTDOWN, CUMMINS |
| WM672A | 106850 | DASH VALVE 3 WAY NON-OVERRIDE |
| WM674A | 106841 | DUAL FUNCTION PARKING BRAKE CONTROL |
| WM774A | 117005 | CHECK VALVE |
| WM775B | 117830 | PNEUMATIC TRANSMISSION MODULATOR |
| WM778A | 118181 | PRESSURE HOLDBACK |
| WM781 | 135253 | CONTROL VALVE 3 WAY 2 POSITION |
| WM781A | 118315 | CONTROL VALVE 3 WAY 2 POSITION |
| WM782A | 118316 | CONTROL VALVE 4 WAY 2 POSITION |
| WM782B | 119068 | CONTROL VALVE 4 WAY 2 POSITION |
| WM783A | 118317 | CONTROL VALVE 3 POSITION 4 WAY |
| WM784A | 118318 | CONTROL VALVE 3 POS. 4 WAY SPRING RETURN |
| WM784B | 118437 | CONTROL VALVE 3 POS. 4 WAY SPRING RETURN |
| WM784B1 | 118713 | CONTROL VALVE 3 POS. 4 WAY SPRING RETURN |
| WM786-100 | 118569 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM786A3 | 118338 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM786B1 | 118340 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM786B2 | 118341 | PANEL MOUNTED AIR REGULATOR VALVE |
| WM786B3 | 118342 | PANEL MOUNTED REGULATING VALVE |
| WM787F | 130492 | 3 POS. 4 WAY REGULATOR CONTROLLER |
| WM770D | 118139 | EXHAUST BRAKE ASSY, GUILLOTINE, 4 – 5" DIA. |
| WM780A | 118012 | EXHAUST BRAKE ASSY, GULLOTINE, 3.5" OR LESS |
BRAKE SYSTEMS INC. is carrying on the tradition of Williams Controls quality. Recently purchased from Williams Controls, we own the dies, jigs and fixtures so we are able to control every step of the manufacturing and assembly. We have key engineers formerly with Williams now on staff to insure the continued quality of our products manufactured and assembled in Portland, Oregon USA. Air valves are 100% tested before leaving BSI. As a stocking manufacturer often we can ship same day. Non stock items have little lead time.
Manufactured in Oregon!
