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The Bendix Air Brake Foot Valve gives the driver graduated control over service braking by turning pedal movement into proportional air pressure. As pedal travel increases, the dual-circuit valve meters pressure progressively instead of behaving like a simple on-off control, so braking input can build smoothly. Because the valve starts the pneumatic brake request at the cab, its role is fundamentally different from downstream relay or modulator hardware. Within that arrangement, the Bendix 800647 keeps the primary and secondary service circuits separate while responding to the same pedal command.
| Auxiliary Supply Port | 3/8-18 NPT |
| BVA-85 Included | No |
| BVA-85 Port Size | Not applicable to this part |
| Delivery (21) Port 1 | 1/2 PTC |
| Delivery (21) Port 2 | 3/8 PTC |
| Delivery (22) Port 1 | 1/2 PTC |
| Delivery (22) Port 2 | 1/2 PTC |
| Differential Pressure | 3.0 PSI |
| Exhaust Port | Dust Shield |
| Graduation Spring Style | Rubber Spring |
| Initial Pedal Angle | Not applicable to this part |
| Market Indicator | Aftermarket New |
| Maximum Operating Temperature | 200 AdegF (93 AdegC) |
| Minimum Operating Temperature | -40 AdegF (-40 AdegC) |
| Mounting (Valve Body) | 5/16-18 UNC-3B (3x) |
| Mounting (Vehicle) | Not applicable to this part |
| Mounting Nuts / Washers Included | Not applicable to this part |
| Mounting Plate Included | No |
| Mounting Stud Length | Not applicable to this part |
| Pedal Included | No |
| Pedal Length (from Pivot) | Not applicable to this part |
| Pedal Length (Overall) | Not applicable to this part |
| Pedal Material | Not applicable to this part |
| Pedal Offset | Not applicable to this part |
| Pedal Pad Included | Not applicable to this part |
| Pedal Style | Not applicable to this part |
| Plunger Material | Not applicable to this part |
| Port Configuration | Parallel |
| Regulatory Compliance | FMVSS 121 |
| Retarder Cable Length | Not applicable to this part |
| Retarder Connector | Not applicable to this part |
| Retarder Included | No |
| Rubber Boot Included | No |
| Supply (11) Port 1 | 3/8 PTC |
| Supply (11) Port 2 | 5/8 PTC |
| Supply (12) Port 1 | 3/8 PTC |
| Supply (12) Port 2 | 5/8 PTC |
| Total Pedal Travel | Not applicable to this part |
| Waterproof | No |
| Country of Origin (Primary) | MX |
| UPC | 07894294739158 |
| VMRS Code | 013010051 |
| Brand | Part Number |
|---|---|
| BW800647 | |
| N/A | 287368N |
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