Motor Grader Foot Brake Valve – Pedal, Ports and Circuit Guide
A motor grader foot valve meters brake pressure from the pedal. Similar bodies may be designed for air or hydraulic circuits and can use different port logic, cracking pressure or linkage geometry.
Ordering basis: Confirm air or hydraulic circuit type, port labels, thread sizes, linkage and valve markings.
Brake-valve evidence to collect
Identify the brake-system medium and machine serial number.
Photograph every port label and hose position.
Measure mounting holes and pedal-linkage connection.
Record casting, tag and repair-kit numbers.
Brake symptoms require system diagnosis
Dragging, delayed release or unequal braking can also come from contaminated lines, wheel-end faults, air leaks or incorrect adjustment. Test the complete system before replacing the valve.
Safety-critical installation checks
Label lines before removal, keep ports clean and use the specified seals. After installation, perform leak, pressure, release and balanced-braking tests in a controlled area.
Product record
| Component | Foot-operated brake valve |
| Part number | Not shown — verify from the original component or parts catalogue |
| Fitment rule | brake circuit, port map, thread type, pedal linkage and machine serial number |
Related product reference
Review the grader hydraulic valve identification guide for another component-level identification workflow. The linked product is a reference only and does not establish interchangeability.
FAQ
Can an air foot valve replace a hydraulic valve?
No. The circuit medium and internal design are fundamentally different.
Why does the brake pedal not return?
Check linkage, return springs, contamination and downstream pressure before blaming the valve.
What must be tested after replacement?
Verify leakage, pressure rise, full release and balanced braking.
Compatibility note: Brake-system type and port logic must be proven before purchase.
